var-200805-0198
Vulnerability from variot

Multiple unspecified vulnerabilities in the SSH server in Cisco IOS 12.4 allow remote attackers to cause a denial of service (device restart) via unknown vectors, aka Bug ID (1) CSCsk42419, (2) CSCsk60020, and (3) CSCsh51293. Cisco IOS of SSH server There is a service disruption (DoS) There is a vulnerability that becomes a condition. The problem is Bug ID : CSCsk42419, CSCsk60020, CSCsh51293 It is a problem.Service disruption by a third party (DoS) There is a possibility of being put into a state. Successfully exploiting these issues allows remote attackers to generate spurious memory-access errors or cause the targeted device to reload. Repeated attacks will lead to denial-of-service conditions. These issues are tracked by Cisco Bug IDs CSCsk42419, CSCsk60020, and CSCsh51293. These issues affect devices running 12.4-based IOS releases that have SSH configured. Note that SSH is not configured by default. ----------------------------------------------------------------------

Secunia Network Software Inspector 2.0 (NSI) - Public Beta

The Public Beta has ended. Thanks to all that participated.

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

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

ORIGINAL ADVISORY: http://www.cisco.com/warp/public/707/cisco-sa-20080521-ssh.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/secunia_security_advisories/

Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/

Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor.

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.

Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-1159 has been assigned to this vulnerability.

The IOS secure shell server is disabled by default. To determine if SSH is enabled, use the show ip ssh command. 

Router#show ip ssh
SSH Enabled - version 2.0
Authentication timeout: 120 secs; Authentication retries: 3

The previous output shows that SSH is enabled on this device and that the SSH protocol major version that is being supported is 2.0. If the text "SSH Disabled" is displayed, the device is not vulnerable. Possible values for the SSH protocol version reported by IOS are:

  • 1.5: only SSH protocol version 1 is enabled
  • 1.99: SSH protocol version 2 with SSH protocol version 1 compatibility enabled
  • 2.0: only SSH protocol version 2 is enabled

For more information about SSH versions in IOS, please check the following URL: http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gt_ssh2.html

The SSH server is not available in all IOS images. Devices that do not support SSH are not vulnerable. Please consult the table of fixed software in the Software Version and Fixes section for the specific 12.4-based IOS releases that are affected.

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

The following example identifies a Cisco product running IOS release 12.4(17):

Cisco IOS Software, C2600 Software (C2600-ADVENTERPRISEK9-M), Version 12.4(17),
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc. 
Compiled Fri 07-Sep-07 16:05 by prod_rel_team

ROM: System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)

Router uptime is 1 week, 5 hours, 5 minutes
System returned to ROM by power-on
System image file is "flash:c2600-adventerprisek9-mz.124-17.bin"

Additional information about Cisco IOS release naming is available at http://www.cisco.com/warp/public/620/1.html

Products Confirmed Not Vulnerable +--------------------------------

Cisco devices that do not run IOS are not affected.

IOS-XR images are not affected.

The following IOS release trains are not affected:

  • 10-based releases
  • 11-based releases
  • 12.0-based releases
  • 12.1-based releases
  • 12.2-based releases
  • 12.3-based releases

IOS releases prior to 12.4(7), 12.4(13d)JA, and 12.4(9)T are not affected by this vulnerability.

No other Cisco products are currently known to be affected by these vulnerabilities.

Details

Secure shell (SSH) was developed as a secure replacement for the telnet, ftp, rlogin, rsh, and rcp protocols, which allow for the remote access of devices. The main difference between SSH and older protocols is that SSH provides strong authentication, guarantees confidentiality, and uses encrypted transactions.

A device with the SSH server enabled is vulnerable.

These vulnerabilities are documented in Cisco Bug IDs:

  • CSCsk42419 ( registered customers only)
  • CSCsk60020 ( registered customers only)
  • CSCsh51293 ( registered customers only)

Vulnerability Scoring Details

Cisco is providing scores for the vulnerabilities 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.

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

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

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

  • CSCsk42419 - SSHv2 spurious memory access

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

  • CSCsk60020 - SSHv2 spurious memory access

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

  • CSCsh51293 - Spurious memory access when SSH packets received

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 these vulnerabilities may result in a spurious memory access or, in certain cases, reload the device potentially resulting in a DoS condition.

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) describes a release train and the platforms or products for which it is intended. If a given release train is vulnerable, then the earliest possible releases that contain the fix (the "First Fixed Release") and the anticipated date of availability for each are listed in the "Rebuild" and "Maintenance" columns. 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. The release should be upgraded at least to the indicated release or a later version (greater than or equal to the First Fixed Release label).

For more information on the terms "Rebuild" and "Maintenance," consult the following URL: http://www.cisco.com/warp/public/620/1.html

IOS releases prior to 12.4(7), 12.4(13d)JA, and 12.4(9)T are not affected by this vulnerability.

+----------------------------------------+ | Major | Availability of Repaired | | Release | Releases | |------------+---------------------------| | Affected | First Fixed | Recommended | | 12.0-Based | Release | Release | | Releases | | | |----------------------------------------| | There are no affected 12.0 based | | releases | |----------------------------------------| | Affected | First Fixed | Recommended | | 12.1-Based | Release | Release | | Releases | | | |----------------------------------------| | There are no affected 12.1 based | | releases | |----------------------------------------| | Affected | First Fixed | Recommended | | 12.2-Based | Release | Release | | Releases | | | |----------------------------------------| | There are no affected 12.2 based | | releases | |----------------------------------------| | Affected | First Fixed | Recommended | | 12.3-Based | Release | Release | | Releases | | | |----------------------------------------| | There are no affected 12.3 based | | releases | |----------------------------------------| | Affected | First Fixed | Recommended | | 12.4-Based | Release | Release | | Releases | | | |------------+-------------+-------------| | | 12.4(13f) | | | | | | | | 12.4(16b) | | | 12.4 | | 12.4(18b) | | | 12.4(17a) | | | | | | | | 12.4(18) | | |------------+-------------+-------------| | | Only 12.4 | | | | (13d)JA and | | | | 12.4(13d) | | | | JA1 are | | | 12.4JA | vulnerable, | 12.4(16b) | | | all other | JA3 | | | 12.4JA | | | | releases | | | | are not | | | | affected. | | |------------+-------------+-------------| | 12.4JK | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4JMA | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4JMB | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4JMC | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4JX | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4MD | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4MR | 12.4(16)MR2 | 12.4(16)MR | |------------+-------------+-------------| | 12.4SW | 12.4(15)SW1 | 12.4(15)SW1 | |------------+-------------+-------------| | | 12.4(9)T6 | | | | | | | | 12.4(11)T4 | | | 12.4T | | 12.4(15)T5 | | | 12.4(15)T2 | | | | | | | | 12.4(20)T | | |------------+-------------+-------------| | 12.4XA | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XB | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XC | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XD | Not | | | | Vulnerable | | |------------+-------------+-------------| | | Vulnerable; | | | 12.4XE | first fixed | 12.4(15)T5 | | | in 12.4T | | |------------+-------------+-------------| | | Vulnerable; | | | 12.4XF | first fixed | 12.4(15)T5 | | | in 12.4T | | |------------+-------------+-------------| | 12.4XG | Not | | | | Vulnerable | | |------------+-------------+-------------| | | Vulnerable; | | | 12.4XJ | first fixed | 12.4(15)T5 | | | in 12.4T | | |------------+-------------+-------------| | | Vulnerable; | | | 12.4XK | first fixed | 12.4(15)T5 | | | in 12.4T | | |------------+-------------+-------------| | 12.4XL | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XM | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XN | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XQ | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XT | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XV | Vulnerable; | | | | contact TAC | | |------------+-------------+-------------| | 12.4XW | 12.4(11)XW6 | 12.4(11)XW6 | |------------+-------------+-------------| | 12.4XY | Not | | | | Vulnerable | | |------------+-------------+-------------| | 12.4XZ | Not | | | | Vulnerable | | +----------------------------------------+

Workarounds

If disabling the IOS SSH Server is not feasible, the following workarounds may be useful to some customers in their environments.

Telnet +-----

Telnet is not vulnerable to the issue described in this advisory and may be used as an insecure alternative to SSH. Telnet does not encrypt the authentication information or data; therefore, it should only be enabled for trusted local networks.

VTY Access Class +---------------

It is possible to limit the exposure of the Cisco device by applying a VTY access class to allow only known, trusted hosts to connect to the device via SSH.

For more information on restricting traffic to VTYs, please consult: http://cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_reference_chapter09186a00800873c8.html#wp1017389

The following example permits access to VTYs from the 192.168.1.0/24 netblock and the single IP address 172.16.1.2 while denying access from anywhere else:

Router(config)# access-list 1 permit 192.168.1.0 0.0.0.255
Router(config)# access-list 1 permit host 172.16.1.2
Router(config)# line vty 0 4
Router(config-line)# access-class 1 in

Different Cisco platforms support different numbers of terminal lines. Check your device's configuration to determine the correct number of terminal lines for your platform.

Infrastructure ACLs (iACL) +-------------------------

Although it is often difficult to block traffic transiting your network, it is possible to identify traffic that should never be allowed to target your infrastructure devices and block that traffic at the border of your network. Infrastructure ACLs are considered a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for this specific vulnerability. The ACL example shown below should be included as part of the deployed infrastructure access-list, which will protect all devices with IP addresses in the infrastructure IP address range.

A sample access list for devices running Cisco IOS is below:

!--- Permit SSH services from trusted hosts destined 
!--- to infrastructure addresses. 
access-list 150 permit tcp TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK eq 22
!--- Deny SSH packets from all other sources destined to infrastructure addresses. 
access-list 150 deny   tcp any INFRASTRUCTURE_ADDRESSES MASK eq 22
!--- Permit all other traffic to transit the device. 
access-list 150 permit IP any any

interface serial 2/0
  ip access-group 150 in

The white paper titled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists. This white paper can be obtained here: http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml

Control Plane Policing (CoPP) +----------------------------

The Control Plane Policing (CoPP) feature may be used to mitigate these vulnerabilities. In the following example, only SSH traffic from trusted hosts and with 'receive' destination IP addresses is permitted to reach the route processor (RP).

Note: Dropping traffic from unknown or untrusted IP addresses may affect hosts with dynamically assigned IP addresses from connecting to the Cisco IOS device. 

access-list 152 deny   tcp TRUSTED_ADDRESSES MASK any eq 22
    access-list 152 permit tcp any any eq 22
    !
    class-map match-all COPP-KNOWN-UNDESIRABLE
     match access-group 152
    !
    !
    policy-map COPP-INPUT-POLICY
     class COPP-KNOWN-UNDESIRABLE
      drop
    !
    control-plane
     service-policy input COPP-INPUT-POLICY

In the above CoPP example, the ACL entries that match the exploit packets with the "permit" action result in these packets being discarded by the policy-map "drop" function, while packets that match the "deny" action are not affected by the policy-map drop function.

CoPP is available in Cisco IOS release trains 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T.

Additional information on the configuration and use of the CoPP feature can be found at the following URL: http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd804fa16a.html

Obtaining Fixed Software

Cisco has made free software available to address this vulnerability for affected customers. 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/public/sw-license-agreement.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml

Do not contact either "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 agreement 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 who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their 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

Have your product serial number available and give the URL of this notice as evidence of your 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 special 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 discovered by Cisco internal testing and customer service requests.

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-20080521-ssh.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-teams@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-May-21 | 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

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    "data": "Multiple unspecified vulnerabilities in the SSH server in Cisco IOS 12.4 allow remote attackers to cause a denial of service (device restart) via unknown vectors, aka Bug ID (1) CSCsk42419, (2) CSCsk60020, and (3) CSCsh51293. Cisco IOS of SSH server There is a service disruption (DoS) There is a vulnerability that becomes a condition. The problem is Bug ID : CSCsk42419, CSCsk60020, CSCsh51293 It is a problem.Service disruption by a third party (DoS) There is a possibility of being put into a state. \nSuccessfully exploiting these issues allows remote attackers to generate spurious memory-access errors or cause the targeted device to reload.  Repeated attacks will lead to denial-of-service conditions. \nThese issues are tracked by Cisco Bug IDs CSCsk42419, CSCsk60020, and CSCsh51293. \nThese issues affect devices running 12.4-based IOS releases that have SSH configured.  Note that SSH is not configured by default. ----------------------------------------------------------------------\n\nSecunia Network Software Inspector 2.0 (NSI) - Public Beta\n\nThe Public Beta has ended. Thanks to all that participated. \n\nSOLUTION:\nUpdate to a fixed version (please see the vendor\u0027s advisory for\ndetails). \n\nPROVIDED AND/OR DISCOVERED BY:\nReported by the vendor. \n\nORIGINAL ADVISORY:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080521-ssh.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/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/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. \n\nCommon Vulnerabilities and Exposures (CVE) identifier CVE-2008-1159\nhas been assigned to this vulnerability. \n\nThe IOS secure shell server is disabled by default. To determine if\nSSH is enabled, use the show ip ssh command. \n\n    Router#show ip ssh\n    SSH Enabled - version 2.0\n    Authentication timeout: 120 secs; Authentication retries: 3\n\nThe previous output shows that SSH is enabled on this device and that\nthe SSH protocol major version that is being supported is 2.0. If the\ntext \"SSH Disabled\" is displayed, the device is not vulnerable. \nPossible values for the SSH protocol version reported by IOS are:\n\n  * 1.5: only SSH protocol version 1 is enabled\n  * 1.99: SSH protocol version 2 with SSH protocol version 1\n    compatibility enabled\n  * 2.0: only SSH protocol version 2 is enabled\n\nFor more information about SSH versions in IOS, please check the\nfollowing URL: \nhttp://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gt_ssh2.html\n\nThe SSH server is not available in all IOS images. Devices that do\nnot support SSH are not vulnerable. Please consult the table of fixed\nsoftware in the Software Version and Fixes section for the specific\n12.4-based IOS releases that are affected. \n\nTo determine the software running on a Cisco product, log in to the\ndevice and issue the show version command to display the system\nbanner. Cisco IOS software will identify itself as \"Internetwork\nOperating System Software\" or simply \"IOS\". The image name will be\ndisplayed between parentheses on the next line of output followed by\n\"Version\" and the IOS release name. Other Cisco devices will not have\nthe show version command or will give different output. \n\nThe following example identifies a Cisco product running IOS release\n12.4(17):\n\n    Cisco IOS Software, C2600 Software (C2600-ADVENTERPRISEK9-M), Version 12.4(17),\n    RELEASE SOFTWARE (fc1)\n    Technical Support: http://www.cisco.com/techsupport\n    Copyright (c) 1986-2007 by Cisco Systems, Inc. \n    Compiled Fri 07-Sep-07 16:05 by prod_rel_team\n    \n    ROM: System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)\n    \n    Router uptime is 1 week, 5 hours, 5 minutes\n    System returned to ROM by power-on\n    System image file is \"flash:c2600-adventerprisek9-mz.124-17.bin\"\n\nAdditional information about Cisco IOS release naming is available at\nhttp://www.cisco.com/warp/public/620/1.html\n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nCisco devices that do not run IOS are not affected. \n\nIOS-XR images are not affected. \n\nThe following IOS release trains are not affected:\n\n  * 10-based releases\n  * 11-based releases\n  * 12.0-based releases\n  * 12.1-based releases\n  * 12.2-based releases\n  * 12.3-based releases\n\nIOS releases prior to 12.4(7), 12.4(13d)JA, and 12.4(9)T are not\naffected by this vulnerability. \n\nNo other Cisco products are currently known to be affected by these\nvulnerabilities. \n\nDetails\n=======\n\nSecure shell (SSH) was developed as a secure replacement for the\ntelnet, ftp, rlogin, rsh, and rcp protocols, which allow for the\nremote access of devices. The main difference between SSH and older\nprotocols is that SSH provides strong authentication, guarantees\nconfidentiality, and uses encrypted transactions. \n\nA device with the SSH server enabled is vulnerable. \n\nThese vulnerabilities are documented in Cisco Bug IDs:\n\n  * CSCsk42419 ( registered customers only)\n  * CSCsk60020 ( registered customers only)\n  * CSCsh51293 ( registered customers only)\n\nVulnerability Scoring Details\n=============================\n\nCisco is providing scores for the vulnerabilities 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\nCisco will provide a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of\nthe vulnerability in individual networks. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \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\n* CSCsk42419 - SSHv2 spurious memory access\n\nCVSS Base Score - 7.8\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    Exploitability -            Functional\n    Remediation Level -         Official-Fix\n    Report Confidence -         Confirmed\n\n* CSCsk60020 - SSHv2 spurious memory access\n\nCVSS Base Score - 7.8\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    Exploitability -            Functional\n    Remediation Level -         Official-Fix\n    Report Confidence -         Confirmed\n\n* CSCsh51293 - Spurious memory access when SSH packets received\n\nCVSS Base Score - 7.8\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    Exploitability -            Functional\n    Remediation Level -         Official-Fix\n    Report Confidence -         Confirmed\n\nImpact\n======\n\nSuccessful exploitation of these vulnerabilities may result in a\nspurious memory access or, in certain cases, reload the device\npotentially resulting in a DoS condition. \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) describes a release\ntrain and the platforms or products for which it is intended. If a\ngiven release train is vulnerable, then the earliest possible\nreleases that contain the fix (the \"First Fixed Release\") and the\nanticipated date of availability for each are listed in the \"Rebuild\"\nand \"Maintenance\" columns. A device running a release in the given\ntrain that is earlier than the release in a specific column (less\nthan the First Fixed Release) is known to be vulnerable. The release\nshould be upgraded at least to the indicated release or a later\nversion (greater than or equal to the First Fixed Release label). \n\nFor more information on the terms \"Rebuild\" and \"Maintenance,\"\nconsult the following URL: \nhttp://www.cisco.com/warp/public/620/1.html\n\nIOS releases prior to 12.4(7), 12.4(13d)JA, and 12.4(9)T are not\naffected by this vulnerability. \n\n+----------------------------------------+\n|   Major    | Availability of Repaired  |\n|  Release   |         Releases          |\n|------------+---------------------------|\n|  Affected  | First Fixed | Recommended |\n| 12.0-Based |   Release   |   Release   |\n|  Releases  |             |             |\n|----------------------------------------|\n| There are no affected 12.0 based       |\n| releases                               |\n|----------------------------------------|\n|  Affected  | First Fixed | Recommended |\n| 12.1-Based |   Release   |   Release   |\n|  Releases  |             |             |\n|----------------------------------------|\n| There are no affected 12.1 based       |\n| releases                               |\n|----------------------------------------|\n|  Affected  | First Fixed | Recommended |\n| 12.2-Based |   Release   |   Release   |\n|  Releases  |             |             |\n|----------------------------------------|\n| There are no affected 12.2 based       |\n| releases                               |\n|----------------------------------------|\n|  Affected  | First Fixed | Recommended |\n| 12.3-Based |   Release   |   Release   |\n|  Releases  |             |             |\n|----------------------------------------|\n| There are no affected 12.3 based       |\n| releases                               |\n|----------------------------------------|\n|  Affected  | First Fixed | Recommended |\n| 12.4-Based |   Release   |   Release   |\n|  Releases  |             |             |\n|------------+-------------+-------------|\n|            | 12.4(13f)   |             |\n|            |             |             |\n|            | 12.4(16b)   |             |\n| 12.4       |             | 12.4(18b)   |\n|            | 12.4(17a)   |             |\n|            |             |             |\n|            | 12.4(18)    |             |\n|------------+-------------+-------------|\n|            | Only 12.4   |             |\n|            | (13d)JA and |             |\n|            | 12.4(13d)   |             |\n|            | JA1 are     |             |\n| 12.4JA     | vulnerable, | 12.4(16b)   |\n|            | all other   | JA3         |\n|            | 12.4JA      |             |\n|            | releases    |             |\n|            | are not     |             |\n|            | affected.   |             |\n|------------+-------------+-------------|\n| 12.4JK     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4JMA    | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4JMB    | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4JMC    | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4JX     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4MD     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4MR     | 12.4(16)MR2 | 12.4(16)MR  |\n|------------+-------------+-------------|\n| 12.4SW     | 12.4(15)SW1 | 12.4(15)SW1 |\n|------------+-------------+-------------|\n|            | 12.4(9)T6   |             |\n|            |             |             |\n|            | 12.4(11)T4  |             |\n| 12.4T      |             | 12.4(15)T5  |\n|            | 12.4(15)T2  |             |\n|            |             |             |\n|            | 12.4(20)T   |             |\n|------------+-------------+-------------|\n| 12.4XA     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XB     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XC     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XD     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n|            | Vulnerable; |             |\n| 12.4XE     | first fixed | 12.4(15)T5  |\n|            | in 12.4T    |             |\n|------------+-------------+-------------|\n|            | Vulnerable; |             |\n| 12.4XF     | first fixed | 12.4(15)T5  |\n|            | in 12.4T    |             |\n|------------+-------------+-------------|\n| 12.4XG     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n|            | Vulnerable; |             |\n| 12.4XJ     | first fixed | 12.4(15)T5  |\n|            | in 12.4T    |             |\n|------------+-------------+-------------|\n|            | Vulnerable; |             |\n| 12.4XK     | first fixed | 12.4(15)T5  |\n|            | in 12.4T    |             |\n|------------+-------------+-------------|\n| 12.4XL     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XM     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XN     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XQ     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XT     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XV     | Vulnerable; |             |\n|            | contact TAC |             |\n|------------+-------------+-------------|\n| 12.4XW     | 12.4(11)XW6 | 12.4(11)XW6 |\n|------------+-------------+-------------|\n| 12.4XY     | Not         |             |\n|            | Vulnerable  |             |\n|------------+-------------+-------------|\n| 12.4XZ     | Not         |             |\n|            | Vulnerable  |             |\n+----------------------------------------+\n\nWorkarounds\n===========\n\nIf disabling the IOS SSH Server is not feasible, the following\nworkarounds may be useful to some customers in their environments. \n\nTelnet\n+-----\n\nTelnet is not vulnerable to the issue described in this advisory and\nmay be used as an insecure alternative to SSH. Telnet does not\nencrypt the authentication information or data; therefore, it should\nonly be enabled for trusted local networks. \n\nVTY Access Class\n+---------------\n\nIt is possible to limit the exposure of the Cisco device by applying\na VTY access class to allow only known, trusted hosts to connect to\nthe device via SSH. \n\nFor more information on restricting traffic to VTYs, please consult: \nhttp://cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_reference_chapter09186a00800873c8.html#wp1017389\n\nThe following example permits access to VTYs from the 192.168.1.0/24\nnetblock and the single IP address 172.16.1.2 while denying access\nfrom anywhere else:\n\n    Router(config)# access-list 1 permit 192.168.1.0 0.0.0.255\n    Router(config)# access-list 1 permit host 172.16.1.2\n    Router(config)# line vty 0 4\n    Router(config-line)# access-class 1 in\n\nDifferent Cisco platforms support different numbers of terminal\nlines. Check your device\u0027s configuration to determine the correct\nnumber of terminal lines for your platform. \n\nInfrastructure ACLs (iACL)\n+-------------------------\n\nAlthough it is often difficult to block traffic transiting your\nnetwork, it is possible to identify traffic that should never be\nallowed to target your infrastructure devices and block that traffic\nat the border of your network. Infrastructure ACLs are considered a\nnetwork security best practice and should be considered as a\nlong-term addition to good network security as well as a workaround\nfor this specific vulnerability. The ACL example shown below should\nbe included as part of the deployed infrastructure access-list, which\nwill protect all devices with IP addresses in the infrastructure IP\naddress range. \n\nA sample access list for devices running Cisco IOS is below:\n\n    \n    !--- Permit SSH services from trusted hosts destined \n    !--- to infrastructure addresses. \n    access-list 150 permit tcp TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK eq 22\n    !--- Deny SSH packets from all other sources destined to infrastructure addresses. \n    access-list 150 deny   tcp any INFRASTRUCTURE_ADDRESSES MASK eq 22\n    !--- Permit all other traffic to transit the device. \n    access-list 150 permit IP any any\n    \n    interface serial 2/0\n      ip access-group 150 in\n\nThe white paper titled \"Protecting Your Core: Infrastructure\nProtection Access Control Lists\" presents guidelines and recommended\ndeployment techniques for infrastructure protection access lists. \nThis white paper can be obtained here: \nhttp://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml\n\nControl Plane Policing (CoPP)\n+----------------------------\n\nThe Control Plane Policing (CoPP) feature may be used to mitigate\nthese vulnerabilities. In the following example, only SSH traffic\nfrom trusted hosts and with \u0027receive\u0027 destination IP addresses is\npermitted to reach the route processor (RP). \n\nNote: Dropping traffic from unknown or untrusted IP addresses may\naffect hosts with dynamically assigned IP addresses from connecting\nto the Cisco IOS device. \n\n    access-list 152 deny   tcp TRUSTED_ADDRESSES MASK any eq 22\n        access-list 152 permit tcp any any eq 22\n        !\n        class-map match-all COPP-KNOWN-UNDESIRABLE\n         match access-group 152\n        !\n        !\n        policy-map COPP-INPUT-POLICY\n         class COPP-KNOWN-UNDESIRABLE\n          drop\n        !\n        control-plane\n         service-policy input COPP-INPUT-POLICY\n\nIn the above CoPP example, the ACL entries that match the exploit\npackets with the \"permit\" action result in these packets being\ndiscarded by the policy-map \"drop\" function, while packets that match\nthe \"deny\" action are not affected by the policy-map drop function. \n\nCoPP is available in Cisco IOS release trains 12.0S, 12.2SX, 12.2S,\n12.3T, 12.4, and 12.4T. \n\nAdditional information on the configuration and use of the CoPP\nfeature can be found at the following URL: \nhttp://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd804fa16a.html\n\nObtaining Fixed Software\n========================\n\nCisco has made free software available to address this vulnerability\nfor affected customers. Prior to deploying software, customers should\nconsult their maintenance provider or check the software for feature\nset compatibility 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/public/sw-license-agreement.html, or as \notherwise set forth at Cisco.com Downloads at \nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml\n\nDo not contact either \"psirt@cisco.com\" or \"security-alert@cisco.com\"\nfor software 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 agreement 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 who do not hold a Cisco\nservice contract and customers who purchase through third-party\nvendors but are unsuccessful at obtaining fixed software through\ntheir point of sale should get their 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\nHave your product serial number available and give the URL of this\nnotice as evidence of your entitlement to a free upgrade. Free\nupgrades for non-contract customers must be requested through the\nTAC. \n\nRefer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml\nfor additional TAC contact information, including special localized\ntelephone numbers and instructions and e-mail addresses for use in\nvarious languages. \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 discovered by Cisco internal testing and\ncustomer service requests. \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 \nhttp://www.cisco.com/warp/public/707/cisco-sa-20080521-ssh.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-teams@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-May-21 | 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\n This includes instructions for press inquiries regarding Cisco \nsecurity notices. 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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.
  • 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.