var-200809-0358
Vulnerability from variot

Cisco IOS 12.4, when IOS firewall Application Inspection Control (AIC) with HTTP Deep Packet Inspection is enabled, allows remote attackers to cause a denial of service (device reload) via a malformed HTTP transit packet. A successful exploit may cause affected devices to reload, denying service to legitimate users. Cisco IOS is the Internet operating system used on Cisco networking equipment.

Cisco has released free software updates that address this vulnerability.

A mitigation for this vulnerability is available. See the "Workarounds" section for details.

This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml

Note: The September 24, 2008 IOS Advisory bundled publication includes twelve Security Advisories. Eleven of the advisories address vulnerabilities in Cisco's IOS software, and one advisory addresses vulnerabilities in Cisco Unified Communications Manager. Each Advisory lists the releases that correct the vulnerability described in the Advisory. Please reference the following software table to find a release that fixes all published IOS software Advisories as of September 24th, 2008:

http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml

Individual publication links are listed below:

  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
  • http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml

Affected Products

The HTTP AIC feature was introduced in Cisco IOS Software Release 12.4(9)T. The software table in this advisory identifies the affected releases.

To determine the software running on a Cisco IOS product, log in to the device and issue the show version command-line interface (CLI) command to display the system banner. Cisco IOS software will identify itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name will be displayed between parentheses, followed by "Version" and the Cisco IOS release name. Other Cisco devices will not have the show version command, or will give different output.

The following example shows output from a device running Cisco IOS image 12.4(15)T2:

router#show version
Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M),
   Version 12.4(15)T2, RELEASE SOFTWARE (fc7) Technical Support:
http://www.cisco.com/techsupport Copyright (c) 1986-2008 by Cisco
Systems, Inc. Compiled Thu 17-Jan-08 23:12 by prod_rel_team

!--- Output truncated.

Additional information on the Cisco IOS release naming conventions can be found on the document entitled "White Paper: Cisco IOS Reference Guide", which is available at http://www.cisco.com/warp/public/620/1.html

The device is vulnerable if the configuration has a Layer 7 class map and Layer 7 policy map for HTTP deep packet inspection (DPI), and these policies are applied to any firewall zone. If the output contains Policy: http layer7-policymap name , the device is vulnerable. IOS releases before 12.4(9)T are not affected by this issue. Products confirmed not vulnerable include:

  • Cisco PIX
  • Cisco ASA
  • Cisco Firewall Services Module (FWSM)
  • The Virtual Firewall (VFW) application on the multiservice blade (MSB) on the Cisco XR 12000 Series Router

Details

Firewalls are networking devices that control access to an organization's network assets. Firewalls are often positioned at the entrance points into networks. Cisco IOS software provides a set of security features that enable you to configure a simple or elaborate firewall policy, according to your particular requirements.

HTTP uses port 80 by default to transport Internet web services, which are commonly used on the network and rarely challenged with regard to their legitimacy and conformance to standards. Because port 80 traffic is typically allowed through the network without being challenged, many application developers are leveraging HTTP traffic as an alternative transport protocol that will allow their application's traffic to travel through or even bypass the firewall. It also detects users who are tunneling applications through port 80. If the packet is not in compliance with the HTTP protocol, it will be dropped, the connection will be reset, and a syslog message will be generated, as appropriate.

HTTP runs over TCP. For this vulnerability to be exploited, a full three-way handshake between client and server is required before any malicious traffic would be processed to result in a device reload.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss

CSCsh12480 - IOSFW with HTTP AIC may reload on processing crafted HTTP packet

CVSS Base Score - 7.8

    Access Vector          - Network
    Access Complexity      - Low
    Authentication         - None
    Confidentiality Impact - None
    Integrity Impact       - None
    Availability Impact    - Complete

CVSS Temporal Score - 6.4

    Exploitability          - Functional
    Remediation Level       - Official-Fix
    Report Confidence       - Confirmed

Impact

Successful exploitation of the vulnerability may result in a reload of the affected device. Repeated exploitation attempts may result in a sustained denial of service attack.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.

+-------------------------------------------------------------------+ | Major Release | Availability of Repaired Releases | |-----------------+-------------------------------------------------| | Affected | | Recommended | | 12.0-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.0 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.1-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.2-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.2 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.3-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.3 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.4-Based | First Fixed Release | Release | | Releases | | | |-----------------+-----------------------------------+-------------| | 12.4 | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JA | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JK | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JL | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JMA | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JMB | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JMC | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JX | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4MD | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4MR | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4SW | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | | Releases prior to 12.4(9)T are | | | | not vulnerable. First fixed in: | | | | | | | 12.4T | 12.4(9)T7 | 12.4(15)T7 | | | | | | | 12.4(11)T4 | | | | | | | | 12.4(15)T | | |-----------------+-----------------------------------+-------------| | 12.4XA | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XB | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XC | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XD | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XE | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |-----------------+-----------------------------------+-------------| | 12.4XF | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XG | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XJ | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |-----------------+-----------------------------------+-------------| | 12.4XK | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |-----------------+-----------------------------------+-------------| | 12.4XL | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XM | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XN | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XP | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XQ | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XT | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XV | Vulnerable; contact TAC | | |-----------------+-----------------------------------+-------------| | 12.4XW | 12.4(11)XW1 | 12.4(11)XW9 | |-----------------+-----------------------------------+-------------| | 12.4XY | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XZ | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4YA | Not Vulnerable | | +-------------------------------------------------------------------+

Workarounds

There are no known workarounds for this vulnerability. All other firewall features will continue to perform normally. This example shows an existing configuration, followed by how to remove AIC HTTP Deep Packet Inspection:

!--- Existing Configuration
!

parameter-map type inspect global

!

class-map type inspect http match-any layer7-classmap
class-map type inspect match-any layer4-classmap
 match protocol http

!

policy-map type inspect http layer7-policymap
 class type inspect http layer7-classmap
  allow
 class class-default
policy-map type inspect layer4-policymap
 class type inspect layer4-classmap
  inspect global
  service-policy http layer7-policymap
 class class-default

!

zone security inside
 description ** Inside Network **
zone security outside
 description ** Outside Network **
zone-pair security in2out source inside destination outside
 description ** Zone Pair - inside to outside **
 service-policy type inspect layer4-policymap

Remove the service-policy from the zone-pair in question:

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z. 
Router(config)#zone-pair security in2out source inside destination outside
Router(config-sec-zone-pair)#no service-policy type inspect layer4-policymap
Router(config-sec-zone-pair)#exit

Remove the linkage between policy-map type inspect layer4-policymap and policy-map type inspect http layer7-policymap:

Router(config)#policy-map type inspect layer4-policymap
Router(config-pmap)#class type inspect layer4-classmap
Router(config-pmap-c)#no service-policy http layer7-policymap
Router(config-pmap-c)#exit
Router(config-pmap)#exit

Reapply the service-policy to the zone-pair in question:

Router(config)#zone-pair security in2out source inside destination outside
Router(config-sec-zone-pair)#service-policy type inspect layer4-policymap
Router(config-sec-zone-pair)#exit

Although not required, for completeness of the configuration the policy-map type inspect http layer7-policymap and class-map type inspect http match-any layer7-classmap are recommended to be removed. 

Router(config)#no policy-map type inspect http layer7-policymap
Router(config)#no class-map type inspect http match-any layer7-classmap
Router(config)#exit
Router#

Obtaining Fixed Software

Cisco has released free software updates that address this vulnerability. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.

Customers with Service Contracts +-------------------------------

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com

Customers using Third Party Support Organizations +------------------------------------------------

Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts +----------------------------------

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

This vulnerability was found by Cisco internal testing.

Status of this Notice: FINAL

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

Distribution

This advisory is posted on Cisco's worldwide website at:

http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

Revision History

+----------------------------------------+ | Revision | | Initial | | 1.0 | 2008-September-24 | public | | | | release | +----------------------------------------+

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin)

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TITLE: Cisco IOS Multiple Vulnerabilities

SECUNIA ADVISORY ID: SA31990

VERIFY ADVISORY: http://secunia.com/advisories/31990/

CRITICAL: Moderately critical

IMPACT: Exposure of sensitive information, DoS, System access

WHERE:

From remote

OPERATING SYSTEM: Cisco IOS R12.x http://secunia.com/advisories/product/50/ Cisco IOS 12.x http://secunia.com/advisories/product/182/

DESCRIPTION: Some vulnerabilities have been reported in Cisco IOS, which can be exploited by malicious people to disclose sensitive information, cause a DoS (Denial of Service), or to compromise a vulnerable system.

1) An unspecified error exists in the processing of SSL packets during the termination of an SSL session, which can potentially be exploited to crash an affected system.

2) Two unspecified errors exist within the processing of Protocol Independent Multicast (PIM) packets, which can be exploited to cause an affected device to reload.

3) Unspecified errors within the processing of segmented Skinny Call Control Protocol (SCCP) messages can be exploited to cause a Cisco IOS device to reload.

Successful exploitation requires that the device is configured with Network Address Translation (NAT) SCCP Fragmentation Support.

4) A memory leak in the processing of Session Initiation Protocol (SIP) messages can be exploited to cause a DoS for all voice services.

6) An unspecified error in the IOS Intrusion Prevention System (IPS) feature when processing certain IPS signatures that use the SERVICE.DNS engine can be exploited to cause a DoS via specially crafted network traffic.

7) A security issue exists in the processing of extended communities with Multi Protocol Label Switching (MPLS) Virtual Private Networks (VPN), which can lead to traffic leaking from one MPLS VPN to another.

NOTE: This security issue was introduced with CSCee83237.

8) An unspecified error within the Multi Protocol Label Switching (MPLS) Forwarding Infrastructure (MFI) can be exploited to cause a DoS via specially crafted network packets.

Successful exploitation requires access to the MPLS network.

10) An unspecified error in the processing of Layer 2 Tunneling Protocol (L2TP) packets can be exploited to cause an affected device to reload via a specially crafted L2TP packets.

Successful exploitation requires that the L2TP mgmt daemon process is running. This process may be enabled e.g. via Layer 2 virtual private networks (L2VPN), Layer 2 Tunnel Protocol Version 3 (L2TPv3), Stack Group Bidding Protocol (SGBP), or Cisco Virtual Private Dial-Up Networks (VPDN).

11) An unspecified error exists in the processing of IPC messages. This can be exploited to reload an affected device via a specially crafted UDP packet sent to port 1975.

12) A security issue is caused due to the device automatically enabling SNMP with a default community string, which can be exploited to gain control an affected system.

SOLUTION: Update to the fixed version (please see the vendor's advisories for details).

PROVIDED AND/OR DISCOVERED BY: Reported by the vendor.

ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml

About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.

Subscribe: http://secunia.com/advisories/secunia_security_advisories/

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    "data": "Cisco IOS 12.4, when IOS firewall Application Inspection Control (AIC) with HTTP Deep Packet Inspection is enabled, allows remote attackers to cause a denial of service (device reload) via a malformed HTTP transit packet. \nA successful exploit may cause affected devices to reload, denying service to legitimate users. Cisco IOS is the Internet operating system used on Cisco networking equipment. \n\nCisco has released free software updates that address this\nvulnerability. \n\nA mitigation for this vulnerability is available. See the\n\"Workarounds\" section for details. \n\nThis advisory is posted at \nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml\n\nNote: The September 24, 2008 IOS Advisory bundled publication\nincludes twelve Security Advisories. Eleven of the advisories address\nvulnerabilities in Cisco\u0027s IOS software, and one advisory addresses\nvulnerabilities in Cisco Unified Communications Manager. Each\nAdvisory lists the releases that correct the vulnerability described\nin the Advisory. Please reference the following software table to\nfind a release that fixes all published IOS software Advisories as of\nSeptember 24th, 2008:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml\n\nIndividual publication links are listed below:\n\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml\n  * http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml\n\nAffected Products\n=================\n\nThe HTTP AIC feature was introduced in Cisco IOS Software Release\n12.4(9)T. The software table in this advisory identifies the affected\nreleases. \n\nTo determine the software running on a Cisco IOS product, log in to\nthe device and issue the show version command-line interface (CLI)\ncommand to display the system banner. Cisco IOS software will\nidentify itself as \"Internetwork Operating System Software\" or simply\n\"IOS.\" On the next line of output, the image name will be displayed\nbetween parentheses, followed by \"Version\" and the Cisco IOS release\nname. Other Cisco devices will not have the show version command, or\nwill give different output. \n\nThe following example shows output from a device running Cisco IOS\nimage 12.4(15)T2:\n\n    router#show version\n    Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M),\n       Version 12.4(15)T2, RELEASE SOFTWARE (fc7) Technical Support:\n    http://www.cisco.com/techsupport Copyright (c) 1986-2008 by Cisco\n    Systems, Inc. Compiled Thu 17-Jan-08 23:12 by prod_rel_team\n\n    !--- Output truncated. \n\n\nAdditional information on the Cisco IOS release naming conventions\ncan be found on the document entitled \"White Paper: Cisco IOS\nReference Guide\", which is available at \nhttp://www.cisco.com/warp/public/620/1.html\n\nThe device is vulnerable if the configuration has a Layer 7 class map\nand Layer 7 policy map for HTTP deep packet inspection (DPI), and\nthese policies are applied to any firewall zone. \nIf the output contains Policy: http layer7-policymap name , the\ndevice is vulnerable. IOS releases before 12.4(9)T are not affected by this\nissue. Products confirmed not vulnerable include:\n\n  * Cisco PIX\n  * Cisco ASA\n  * Cisco Firewall Services Module (FWSM)\n  * The Virtual Firewall (VFW) application on the multiservice blade\n    (MSB) on the Cisco XR 12000 Series Router\n\nDetails\n=======\n\nFirewalls are networking devices that control access to an\norganization\u0027s network assets. Firewalls are often positioned at the\nentrance points into networks. Cisco IOS software provides a set of\nsecurity features that enable you to configure a simple or elaborate\nfirewall policy, according to your particular requirements. \n\nHTTP uses port 80 by default to transport Internet web services,\nwhich are commonly used on the network and rarely challenged with\nregard to their legitimacy and conformance to standards. Because port\n80 traffic is typically allowed through the network without being\nchallenged, many application developers are leveraging HTTP traffic\nas an alternative transport protocol that will allow their\napplication\u0027s traffic to travel through or even bypass the firewall. It also detects\nusers who are tunneling applications through port 80. If the packet\nis not in compliance with the HTTP protocol, it will be dropped, the\nconnection will be reset, and a syslog message will be generated, as\nappropriate. \n\nHTTP runs over TCP. For this vulnerability to be exploited, a full\nthree-way handshake between client and server is required before any\nmalicious traffic would be processed to result in a device reload. \n\nVulnerability Scoring Details\n=============================\n\nCisco has provided scores for the vulnerability in this advisory\nbased on the Common Vulnerability Scoring System (CVSS). The CVSS\nscoring in this Security Advisory is done in accordance with CVSS\nversion 2.0. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \n\nCisco has provided a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of\nthe vulnerability in individual networks. \n\nCisco has provided an FAQ to answer additional questions regarding\nCVSS at\n\nhttp://www.cisco.com/web/about/security/intelligence/cvss-qandas.html\n\nCisco has also provided a CVSS calculator to help compute the\nenvironmental impact for individual networks at\n\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\nCSCsh12480 - IOSFW with HTTP AIC may reload on processing crafted\n             HTTP packet\n\nCVSS Base Score - 7.8\n\n        Access Vector          - Network\n        Access Complexity      - Low\n        Authentication         - None\n        Confidentiality Impact - None\n        Integrity Impact       - None\n        Availability Impact    - Complete\n\nCVSS Temporal Score - 6.4\n\n        Exploitability          - Functional\n        Remediation Level       - Official-Fix\n        Report Confidence       - Confirmed\n\nImpact\n======\n\nSuccessful exploitation of the vulnerability may result in a reload\nof the affected device. Repeated exploitation attempts may result in\na sustained denial of service attack. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult \nhttp://www.cisco.com/go/psirt and any subsequent advisories to \ndetermine exposure and a complete upgrade solution. \n\nIn all cases, customers should exercise caution to be certain the\ndevices to be upgraded contain sufficient memory and that current\nhardware and software configurations will continue to be supported\nproperly by the new release. If the information is not clear, contact\nthe Cisco Technical Assistance Center (TAC) or your contracted\nmaintenance provider for assistance. \n\nEach row of the Cisco IOS software table (below) names a Cisco IOS\nrelease train. If a given release train is vulnerable, then the\nearliest possible releases that contain the fix (along with the\nanticipated date of availability for each, if applicable) are listed\nin the \"First Fixed Release\" column of the table. The \"Recommended\nRelease\" column indicates the releases which have fixes for all the\npublished vulnerabilities at the time of this Advisory. A device\nrunning a release in the given train that is earlier than the release\nin a specific column (less than the First Fixed Release) is known to\nbe vulnerable. Cisco recommends upgrading to a release equal to or\nlater than the release in the \"Recommended Releases\" column of the\ntable. \n\n+-------------------------------------------------------------------+\n|  Major Release  |        Availability of Repaired Releases        |\n|-----------------+-------------------------------------------------|\n|    Affected     |                                   | Recommended |\n|   12.0-Based    |        First Fixed Release        |   Release   |\n|    Releases     |                                   |             |\n|-------------------------------------------------------------------|\n| There are no affected 12.0 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                                   | Recommended |\n|   12.1-Based    |        First Fixed Release        |   Release   |\n|    Releases     |                                   |             |\n|-------------------------------------------------------------------|\n| There are no affected 12.1 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                                   | Recommended |\n|   12.2-Based    |        First Fixed Release        |   Release   |\n|    Releases     |                                   |             |\n|-------------------------------------------------------------------|\n| There are no affected 12.2 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                                   | Recommended |\n|   12.3-Based    |        First Fixed Release        |   Release   |\n|    Releases     |                                   |             |\n|-------------------------------------------------------------------|\n| There are no affected 12.3 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                                   | Recommended |\n|   12.4-Based    |        First Fixed Release        |   Release   |\n|    Releases     |                                   |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4            | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4JA          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4JK          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4JL          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4JMA         | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4JMB         | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4JMC         | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4JX          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4MD          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4MR          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4SW          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n|                 | Releases prior to 12.4(9)T are    |             |\n|                 | not vulnerable. First fixed in:   |             |\n|                 |                                   |             |\n| 12.4T           | 12.4(9)T7                         | 12.4(15)T7  |\n|                 |                                   |             |\n|                 | 12.4(11)T4                        |             |\n|                 |                                   |             |\n|                 | 12.4(15)T                         |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XA          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XB          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XC          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XD          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XE          | Vulnerable; first fixed in 12.4T  | 12.4(15)T7  |\n|-----------------+-----------------------------------+-------------|\n| 12.4XF          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XG          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XJ          | Vulnerable; first fixed in 12.4T  | 12.4(15)T7  |\n|-----------------+-----------------------------------+-------------|\n| 12.4XK          | Vulnerable; first fixed in 12.4T  | 12.4(15)T7  |\n|-----------------+-----------------------------------+-------------|\n| 12.4XL          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XM          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XN          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XP          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XQ          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XT          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XV          | Vulnerable; contact TAC           |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XW          | 12.4(11)XW1                       | 12.4(11)XW9 |\n|-----------------+-----------------------------------+-------------|\n| 12.4XY          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4XZ          | Not Vulnerable                    |             |\n|-----------------+-----------------------------------+-------------|\n| 12.4YA          | Not Vulnerable                    |             |\n+-------------------------------------------------------------------+\n\nWorkarounds\n===========\n\nThere are no known workarounds for this vulnerability. All other firewall features will continue to perform\nnormally. This example shows an existing\nconfiguration, followed by how to remove AIC HTTP Deep Packet\nInspection:\n\n\n    !--- Existing Configuration\n    !\n\n    parameter-map type inspect global\n\n    !\n\n    class-map type inspect http match-any layer7-classmap\n    class-map type inspect match-any layer4-classmap\n     match protocol http\n\n    !\n\n    policy-map type inspect http layer7-policymap\n     class type inspect http layer7-classmap\n      allow\n     class class-default\n    policy-map type inspect layer4-policymap\n     class type inspect layer4-classmap\n      inspect global\n      service-policy http layer7-policymap\n     class class-default\n\n    !\n\n    zone security inside\n     description ** Inside Network **\n    zone security outside\n     description ** Outside Network **\n    zone-pair security in2out source inside destination outside\n     description ** Zone Pair - inside to outside **\n     service-policy type inspect layer4-policymap\n\nRemove the service-policy from the zone-pair in question:\n\n    Router#configure terminal\n    Enter configuration commands, one per line.  End with CNTL/Z. \n    Router(config)#zone-pair security in2out source inside destination outside\n    Router(config-sec-zone-pair)#no service-policy type inspect layer4-policymap\n    Router(config-sec-zone-pair)#exit\n\nRemove the linkage between policy-map type inspect layer4-policymap\nand policy-map type inspect http layer7-policymap:\n\n    Router(config)#policy-map type inspect layer4-policymap\n    Router(config-pmap)#class type inspect layer4-classmap\n    Router(config-pmap-c)#no service-policy http layer7-policymap\n    Router(config-pmap-c)#exit\n    Router(config-pmap)#exit\n\nReapply the service-policy to the zone-pair in question:\n\n    Router(config)#zone-pair security in2out source inside destination outside\n    Router(config-sec-zone-pair)#service-policy type inspect layer4-policymap\n    Router(config-sec-zone-pair)#exit\n\nAlthough not required, for completeness of the configuration the\npolicy-map type inspect http layer7-policymap and class-map type\ninspect http match-any layer7-classmap are recommended to be removed. \n\n    Router(config)#no policy-map type inspect http layer7-policymap\n    Router(config)#no class-map type inspect http match-any layer7-classmap\n    Router(config)#exit\n    Router#\n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address this\nvulnerability. Prior to deploying software, customers should consult\ntheir maintenance provider or check the software for feature set\ncompatibility and known issues specific to their environment. \n\nCustomers may only install and expect support for the feature sets\nthey have purchased. By installing, downloading, accessing or\notherwise using such software upgrades, customers agree to be bound\nby the terms of Cisco\u0027s software license terms found at \nhttp://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html\nor as otherwise set forth at Cisco.com Downloads at \nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml\n\nDo not contact psirt@cisco.com or security-alert@cisco.com for\nsoftware upgrades. \n\nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through\ntheir regular update channels. For most customers, this means that\nupgrades should be obtained through the Software Center on Cisco\u0027s\nworldwide website at http://www.cisco.com\n\nCustomers using Third Party Support Organizations\n+------------------------------------------------\n\nCustomers whose Cisco products are provided or maintained through\nprior or existing agreements with third-party support organizations,\nsuch as Cisco Partners, authorized resellers, or service providers\nshould contact that support organization for guidance and assistance\nwith the appropriate course of action in regards to this advisory. \n\nThe effectiveness of any workaround or fix is dependent on specific\ncustomer situations, such as product mix, network topology, traffic\nbehavior, and organizational mission. Due to the variety of affected\nproducts and releases, customers should consult with their service\nprovider or support organization to ensure any applied workaround or\nfix is the most appropriate for use in the intended network before it\nis deployed. \n\nCustomers without Service Contracts\n+----------------------------------\n\nCustomers who purchase direct from Cisco but do not hold a Cisco\nservice contract, and customers who purchase through third-party\nvendors but are unsuccessful in obtaining fixed software through\ntheir point of sale should acquire upgrades by contacting the Cisco\nTechnical Assistance Center (TAC). TAC contacts are as follows. \n\n  * +1 800 553 2447 (toll free from within North America)\n  * +1 408 526 7209 (toll call from anywhere in the world)\n  * e-mail: tac@cisco.com\n\nCustomers should have their product serial number available and be\nprepared to give the URL of this notice as evidence of entitlement to\na free upgrade. Free upgrades for non-contract customers must be\nrequested through the TAC. \n\nRefer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml\nfor additional TAC contact information, including localized telephone\nnumbers, and instructions and e-mail addresses for use in various\nlanguages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerability described in this advisory. \n\nThis vulnerability was found by Cisco internal testing. \n\nStatus of this Notice: FINAL\n============================\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY\nKIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF\nMERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE\nINFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS\nAT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS\nDOCUMENT AT ANY TIME. \n\nA stand-alone copy or Paraphrase of the text of this document that\nomits the distribution URL in the following section is an\nuncontrolled copy, and may lack important information or contain\nfactual errors. \n\nDistribution\n============\n\nThis advisory is posted on Cisco\u0027s worldwide website at:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml\n\nIn addition to worldwide web posting, a text version of this notice\nis clear-signed with the Cisco PSIRT PGP key and is posted to the\nfollowing e-mail and Usenet news recipients. \n\n  * cust-security-announce@cisco.com\n  * first-bulletins@lists.first.org\n  * bugtraq@securityfocus.com\n  * vulnwatch@vulnwatch.org\n  * cisco@spot.colorado.edu\n  * cisco-nsp@puck.nether.net\n  * full-disclosure@lists.grok.org.uk\n  * comp.dcom.sys.cisco@newsgate.cisco.com\n\nFuture updates of this advisory, if any, will be placed on Cisco\u0027s\nworldwide website, but may or may not be actively announced on\nmailing lists or newsgroups. Users concerned about this problem are\nencouraged to check the above URL for any updates. \n\nRevision History\n================\n\n+----------------------------------------+\n| Revision |                   | Initial |\n| 1.0      | 2008-September-24 | public  |\n|          |                   | release |\n+----------------------------------------+\n\nCisco Security Procedures\n=========================\n\nComplete information on reporting security vulnerabilities in Cisco\nproducts, obtaining assistance with security incidents, and\nregistering to receive security information from Cisco, is available\non Cisco\u0027s worldwide website at \nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\nThis includes instructions for press inquiries regarding Cisco \nsecurity notices. All Cisco security advisories are available at \nhttp://www.cisco.com/go/psirt\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.8 (Darwin)\n\niEYEARECAAYFAkjaLbkACgkQ86n/Gc8U/uBSqwCgi7dmsFhp1u9fxWgLqVpMPtV+\nfuIAn3f11gNGT/LITk11YI6fjv7W1Q20\n=0tmt\n-----END PGP SIGNATURE-----\n\n_______________________________________________\nFull-Disclosure - We believe in it. \nCharter: http://lists.grok.org.uk/full-disclosure-charter.html\nHosted and sponsored by Secunia - http://secunia.com/\n. ----------------------------------------------------------------------\n\nDo you need accurate and reliable IDS / IPS / AV detection rules?\n\nGet in-depth vulnerability details:\nhttp://secunia.com/binary_analysis/sample_analysis/\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco IOS Multiple Vulnerabilities\n\nSECUNIA ADVISORY ID:\nSA31990\n\nVERIFY ADVISORY:\nhttp://secunia.com/advisories/31990/\n\nCRITICAL:\nModerately critical\n\nIMPACT:\nExposure of sensitive information, DoS, System access\n\nWHERE:\n\u003eFrom remote\n\nOPERATING SYSTEM:\nCisco IOS R12.x\nhttp://secunia.com/advisories/product/50/\nCisco IOS 12.x\nhttp://secunia.com/advisories/product/182/\n\nDESCRIPTION:\nSome vulnerabilities have been reported in Cisco IOS, which can be\nexploited by malicious people to disclose sensitive information,\ncause a DoS (Denial of Service), or to compromise a vulnerable\nsystem. \n\n1) An unspecified error exists in the processing of SSL packets\nduring the termination of an SSL session, which can potentially be\nexploited to crash an affected system. \n\n2) Two unspecified errors exist within the processing of Protocol\nIndependent Multicast (PIM) packets, which can be exploited to cause\nan affected device to reload. \n\n3) Unspecified errors within the processing of segmented Skinny Call\nControl Protocol (SCCP) messages can be exploited to cause a Cisco\nIOS device to reload. \n\nSuccessful exploitation requires that the device is configured with\nNetwork Address Translation (NAT) SCCP Fragmentation Support. \n\n4) A memory leak in the processing of Session Initiation Protocol\n(SIP) messages can be exploited to cause a DoS for all voice\nservices. \n\n6) An unspecified error in the IOS Intrusion Prevention System (IPS)\nfeature when processing certain IPS signatures that use the\nSERVICE.DNS engine can be exploited to cause a DoS via specially\ncrafted network traffic. \n\n7) A security issue exists in the processing of extended communities\nwith Multi Protocol Label Switching (MPLS) Virtual Private Networks\n(VPN), which can lead to traffic leaking from one MPLS VPN to\nanother. \n\nNOTE: This security issue was introduced with CSCee83237. \n\n8) An unspecified error within the Multi Protocol Label Switching\n(MPLS) Forwarding Infrastructure (MFI) can be exploited to cause a\nDoS via specially crafted network packets. \n\nSuccessful exploitation requires access to the MPLS network. \n\n10) An unspecified error in the processing of Layer 2 Tunneling\nProtocol (L2TP) packets can be exploited to cause an affected device\nto reload via a specially crafted L2TP packets. \n\nSuccessful exploitation requires that the L2TP mgmt daemon process is\nrunning. This process may be enabled e.g. via Layer 2 virtual private\nnetworks (L2VPN), Layer 2 Tunnel Protocol Version 3 (L2TPv3), Stack\nGroup Bidding Protocol (SGBP), or Cisco Virtual Private Dial-Up\nNetworks (VPDN). \n\n11) An unspecified error exists in the processing of IPC messages. \nThis can be exploited to reload an affected device via a specially\ncrafted UDP packet sent to port 1975. \n\n12) A security issue is caused due to the device automatically\nenabling SNMP with a default community string, which can be exploited\nto gain control an affected system. \n\nSOLUTION:\nUpdate to the fixed version (please see the vendor\u0027s advisories for\ndetails). \n\nPROVIDED AND/OR DISCOVERED BY:\nReported by the vendor. \n\nORIGINAL ADVISORY:\nCisco:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/advisories/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/advisories/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n",
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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.