var-201106-0111
Vulnerability from variot
The helper application in Cisco AnyConnect Secure Mobility Client (formerly AnyConnect VPN Client) before 2.3.185 on Windows, and on Windows Mobile, downloads a client executable file (vpndownloader.exe) without verifying its authenticity, which allows remote attackers to execute arbitrary code via the url property to a certain ActiveX control in vpnweb.ocx, aka Bug ID CSCsy00904. The Cisco AnyConnect SSL VPN ActiveX and Java clients contain a vulnerability that can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. Cisco AnyConnect Secure Mobility Client is a remote access solution from Cisco that is Cisco's next-generation VPN client. When the Cisco AnyConnect Secure Mobility Client is deployed from the VPN front end, a WEB browser is used to initialize an SSL connection to the VPN front end. After the user logs in, the browser displays the portal window. When the user clicks \"Start AnyConnect\", the process will start downloading the Cisco AnyConnect Secure Mobility Client. The helper application is a Java Applet on Linux and MacOS X platforms or a Java Applet on a Windows platform or an ActiveX plugin on a browser. The downloaded Helper program is in a web browser. The initial site context is executed. The helper program then downloads the program from the VPN front end and executes it. An attacker can exploit this issue by using social engineering techniques to coerce unsuspecting users to download and execute arbitrary applications. This issue is tracked by Cisco Bug IDs CSCsy00904 and CSCsy05934. The control itself is provided by the server upon connecting. For more information, visit the following URL.
http://www.cisco.com/en/US/docs/security/vpn_client/anyconnect/anyconnect23/release/notes/anyconnect23rn.html
II.
The vulnerability exists within the ActiveX control with the following identifiers:
CLSID: 55963676-2F5E-4BAF-AC28-CF26AA587566 ProgId: Cisco.AnyConnect.VPNWeb.1 File: %WINDIR%\system32\vpnweb.ocx
This ActiveX control is not marked as safe for initialization or scripting within the registry, but it does implement IObjectSafety. When queried, this control's IObjectSafety interface reports that it is safe for both scripting and initialization. Once it is instantiated, it will attempt to download two files from the site supported in the "url" property. As such, an attacker can craft a page such that the control will download an executable of their choosing.
One of the files will be executed upon the successful completion of the download.
III. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites.
Additionally, in a default configuration, a targeted user must have this control already installed or must accept several warning prompts at the time that the attack is taking place. This control is not on the white list included with Internet Explorer 7.0. More information can be found at the following URL.
http://msdn.microsoft.com/en-us/library/bb250471.aspx
IV.
V. WORKAROUND
Setting the kill-bit for this control will prevent it from being loaded within Internet Explorer. However, doing so will prevent legitimate use of the control.
VI. For more information, consult their advisory at the following URL.
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b80123.shtml
VII. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
VIII. DISCLOSURE TIMELINE
02/24/2009 Initial Vendor Notification 02/25/2009 Initial Vendor Reply 06/01/2011 Coordinated Public Disclosure
IX.
Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2011 Verisign
Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@idefense.com for permission.
Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. There are no workarounds for the vulnerabilities described in this advisory.
This advisory is posted at: http://www.cisco.com/warp/public/707/cisco-sa-20110601-ac.shtml
Affected Products
Vulnerable Products +------------------
The vulnerabilities described in this document apply to the Cisco AnyConnect Secure Mobility Client. The affected versions are included in the following table:
+------------------------------------------------------------+ | Vulnerability | Platform | Affected Versions | |-------------------+-----------+----------------------------| | | Microsoft | All versions prior to | | | Windows | 2.3.185 | | |-----------+----------------------------| | Arbitrary Program | | * All versions in major | | Execution | | releases other than | | Vulnerability | Linux, | 2.5.x and 3.0.x. | | | Apple | * 2.5.x releases prior | | | MacOS X | to 2.5.3041 | | | | * 3.0.x releases prior | | | | to 3.0.629 | |-------------------+-----------+----------------------------| | | Microsoft | All versions prior to | | Local Privilege | Windows | 2.3.254 | |Escalation |-----------+----------------------------| | Vulnerability | Linux, | | | | Apple | Not affected | | | MacOS X | | +------------------------------------------------------------+
Note: Microsoft Windows Mobile versions are affected by the Arbitrary Program Execution Vulnerability.
No other Cisco products are currently known to be affected by these vulnerabilities. An attacker could create a malicious web page that looks like the normal VPN web login page and entice a user, through social engineering or exploitation of other vulnerabilities, to visit it. This arbitrary executable would be executed with the same operating system privileges under which the web browser was run. Common Vulnerabilities and Exposures (CVE) IDs CVE-2011-2039 (for CSCsy00904) and CVE-2011-2040 (for CSCsy05934) have been assigned for these vulnerabilities. An attacker may engineer a web page to supply an affected version of the ActiveX control or Java applet and still accomplish arbitrary program execution because of the lack of authenticity validation. When this occurs, an old version of the ActiveX control will not be instantiated if one is presented for download. This action accomplishes the same result as the previous recommendation -- it deploys new, fixed versions of the ActiveX control so that old, vulnerable versions of the control are not instantiated if one is presented for download. This action prevents the ActiveX control from being instantiated under any scenario. Instructions for setting the kill bit are beyond the scope of this document; refer to the Microsoft Support article "How to stop an ActiveX control from running in Internet Explorer" at http://support.microsoft.com/kb/240797 and the Microsoft Security Vulnerability Research & Defense's "Kill-Bit FAQ" blog posts referenced in the Microsoft Support article for more information. Note that this CLSID did not change with new versions of the ActiveX control that implement code signing validation.
Mitigating the risk of old versions of the Java applet can be accomplished by blacklisting old, vulnerable versions using the Jar blacklist feature introduced with Java SE 6 Update 14. For information on the Jar blacklist feature refer to the Java SE 6 Update 14 release notes, available at: http://www.oracle.com/technetwork/java/javase/6u14-137039.html
The jar files to be blacklisted are identified by the following SHA-1 message digests:
# 2.3.0254, 2.3.1003, 2.3.2016, 2.4.0202, 2.4.1012,
# 2.5.0217, 2.5.1025, 2.5.2001, 2.5.2006, 2.5.2010,
# 2.5.2011, 2.5.2014, 2.5.2017, 2.5.2018, 2.5.2019
SHA1-Digest-Manifest : xmarT5s8kwnKRLxnCOoLUnxnveE=
# 2.2.0133, 2.2.0136, 2.2.0140
SHA1-Digest-Manifest : 2wXAWNws4uNdCioU1eoCOS4+J3o=
# 2.0.0343, 2.1.0148
SHA1-Digest-Manifest : OlNnvozFCxbJZbRfGiLckOE8uFQ=
Local Privilege Escalation Vulnerability +---------------------------------------
Unprivileged users can elevate their privileges to those of the LocalSystem account by enabling the Start Before Logon (SBL) feature and interacting with the Cisco AnyConnect Secure Mobility Client graphical user interface in the Windows logon screen.
To prevent this issue, fixed versions of the Cisco AnyConnect Secure Mobility Client limit the amount of interaction that is possible in the client's graphical user interface when it is displayed on the Windows logon screen.
Vulnerability Scoring Details +----------------------------
Cisco has provided 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.
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
- CSCsy00904 & CSCsy05934 - Arbitrary Program Execution Vulnerability
CVSS Base Score - 7.6 Access Vector - Network Access Complexity - High Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete
CVSS Temporal Score - 6.3 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
- CSCta40556 -- AnyConnect: Security issue with SBL on versions prior to 2.3
CVSS Base Score - 7.2 Access Vector - Local Access Complexity - Low Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete
CVSS Temporal Score - 6.0 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
Impact
Arbitrary Program Execution Vulnerability +----------------------------------------
Exploitation of this vulnerability may allow an attacker to execute arbitrary programs on the computer of a Cisco AnyConnect Secure Mobility Client user with the privileges of the user who is establishing the VPN connection.
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.
+------------------------------------------------------------+ | Vulnerability | Platform | First Fixed | | | | Release | |----------------------------+---------------+---------------| | | Microsoft | 2.3.185 | | Arbitrary Program | Windows | | |Execution Vulnerability |---------------+---------------| | | Linux, Apple | 2.5.3041 and | | | Mac OS X | 3.0.629 | |----------------------------+---------------+---------------| | | Microsoft | 2.3.254 | | Local Privilege Escalation | Windows | | |Vulnerability |---------------+---------------| | | Linux, Apple | Not affected | | | Mac OS X | | +------------------------------------------------------------+
Recommended Releases
The following table lists all recommended releases. These recommended releases contain the fixes for all vulnerabilities in this advisory. Cisco recommends upgrading to a release that is equal to or later than these recommended releases.
Workarounds
There are no workarounds for the vulnerabilities that are described in this advisory.
Obtaining Fixed Software
Cisco has released free software updates that address these vulnerabilities. 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/docs/general/warranty/English/EU1KEN_.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/en/US/support/tsd_cisco_worldwide_contacts.html 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. Cisco would like to thank iDefense for reporting this vulnerability and for working with us towards a coordinated disclosure of the vulnerability.
The Local Privilege Escalation Vulnerability was reported to Cisco by a customer.
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-20110601-ac.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 | 2011-June-01 | 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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Join Secunia @ FIRST Conference, 12-17 June, Hilton Vienna, Austria See to the presentation "The Dynamics and Threats of End-Point Software Portfolios" by Secunia's Research Analyst Director, Stefan Frei. Read more: http://conference.first.org/
TITLE: Cisco AnyConnect VPN Client Two Vulnerabilities
SECUNIA ADVISORY ID: SA44812
VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/44812/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=44812
RELEASE DATE: 2011-06-03
DISCUSS ADVISORY: http://secunia.com/advisories/44812/#comments
AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s)
http://secunia.com/advisories/44812/
ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS
https://ca.secunia.com/?page=viewadvisory&vuln_id=44812
ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI: * AUTOMATED SCANNING
http://secunia.com/vulnerability_scanning/personal/ http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/
DESCRIPTION: Two vulnerabilities have been reported in Cisco AnyConnect VPN Client, which can be exploited by malicious people with physical access to bypass certain security restrictions and by malicious people to compromise a user's system.
Successful exploitation of this vulnerability requires the Start Before Logon (SBL) feature to be enabled.
2) An error in the helper application used for remote deployment of the client (e.g.
SOLUTION: Update to a fixed version (please see the vendor's advisory for details).
PROVIDED AND/OR DISCOVERED BY: 1) Reported to the vendor by a customer. 2) The vendor credits Elazar Broad via iDefense.
ORIGINAL ADVISORY: Cisco (cisco-sa-20110601-ac): http://www.cisco.com/warp/public/707/cisco-sa-20110601-ac.shtml
OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
DEEP LINKS: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXPLOIT: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities.
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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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"data": "The helper application in Cisco AnyConnect Secure Mobility Client (formerly AnyConnect VPN Client) before 2.3.185 on Windows, and on Windows Mobile, downloads a client executable file (vpndownloader.exe) without verifying its authenticity, which allows remote attackers to execute arbitrary code via the url property to a certain ActiveX control in vpnweb.ocx, aka Bug ID CSCsy00904. The Cisco AnyConnect SSL VPN ActiveX and Java clients contain a vulnerability that can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. Cisco AnyConnect Secure Mobility Client is a remote access solution from Cisco that is Cisco\u0027s next-generation VPN client. When the Cisco AnyConnect Secure Mobility Client is deployed from the VPN front end, a WEB browser is used to initialize an SSL connection to the VPN front end. After the user logs in, the browser displays the portal window. When the user clicks \\\"Start AnyConnect\\\", the process will start downloading the Cisco AnyConnect Secure Mobility Client. The helper application is a Java Applet on Linux and MacOS X platforms or a Java Applet on a Windows platform or an ActiveX plugin on a browser. The downloaded Helper program is in a web browser. The initial site context is executed. The helper program then downloads the program from the VPN front end and executes it. \nAn attacker can exploit this issue by using social engineering techniques to coerce unsuspecting users to download and execute arbitrary applications. \nThis issue is tracked by Cisco Bug IDs CSCsy00904 and CSCsy05934. The control itself is provided by the server upon connecting. For more information, visit the following URL. \n\nhttp://www.cisco.com/en/US/docs/security/vpn_client/anyconnect/anyconnect23/release/notes/anyconnect23rn.html\n\nII. \n\nThe vulnerability exists within the ActiveX control with the following\nidentifiers:\n\n CLSID: 55963676-2F5E-4BAF-AC28-CF26AA587566\n ProgId: Cisco.AnyConnect.VPNWeb.1\n File: %WINDIR%\\system32\\vpnweb.ocx\n\nThis ActiveX control is not marked as safe for initialization or\nscripting within the registry, but it does implement IObjectSafety. When\nqueried, this control\u0027s IObjectSafety interface reports that it is safe\nfor both scripting and initialization. Once it is\ninstantiated, it will attempt to download two files from the site\nsupported in the \"url\" property. As such, an attacker can craft a page\nsuch that the control will download an executable of their choosing. \n\nOne of the files will be executed upon the successful completion of the\ndownload. \n\nIII. An\nattacker typically accomplishes this via social engineering or injecting\ncontent into compromised, trusted sites. \n\nAdditionally, in a default configuration, a targeted user must have this\ncontrol already installed or must accept several warning prompts at the\ntime that the attack is taking place. This control is not on the white\nlist included with Internet Explorer 7.0. More information can be found\nat the following URL. \n\nhttp://msdn.microsoft.com/en-us/library/bb250471.aspx\n\nIV. \n\nV. WORKAROUND\n\nSetting the kill-bit for this control will prevent it from being loaded\nwithin Internet Explorer. However, doing so will prevent legitimate use\nof the control. \n\nVI. For more information, consult their\nadvisory at the following URL. \n\nhttp://www.cisco.com/en/US/products/products_security_advisory09186a0080b80123.shtml\n\nVII. This is a candidate for inclusion in\nthe CVE list (http://cve.mitre.org/), which standardizes names for\nsecurity problems. \n\nVIII. DISCLOSURE TIMELINE\n\n02/24/2009 Initial Vendor Notification\n02/25/2009 Initial Vendor Reply\n06/01/2011 Coordinated Public Disclosure\n\nIX. \n\nGet paid for vulnerability research\nhttp://labs.idefense.com/methodology/vulnerability/vcp.php\n\nFree tools, research and upcoming events\nhttp://labs.idefense.com/\n\nX. LEGAL NOTICES\n\nCopyright \u00a9 2011 Verisign\n\nPermission is granted for the redistribution of this alert\nelectronically. It may not be edited in any way without the express\nwritten consent of iDefense. If you wish to reprint the whole or any\npart of this alert in any other medium other than electronically, please\ne-mail customerservice@idefense.com for permission. \n\nDisclaimer: The information in the advisory is believed to be accurate\nat the time of publishing based on currently available information. \n There are no warranties with regard to this information. Neither the\nauthor nor the publisher accepts any liability for any direct, indirect,\nor consequential loss or damage arising from use of, or reliance on,\nthis information. There are no workarounds for the vulnerabilities\ndescribed in this advisory. \n\nThis advisory is posted at:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20110601-ac.shtml\n\nAffected Products\n=================\n\nVulnerable Products\n+------------------\n\nThe vulnerabilities described in this document apply to the Cisco\nAnyConnect Secure Mobility Client. The affected versions are included\nin the following table:\n\n+------------------------------------------------------------+\n| Vulnerability | Platform | Affected Versions |\n|-------------------+-----------+----------------------------|\n| | Microsoft | All versions prior to |\n| | Windows | 2.3.185 |\n| |-----------+----------------------------|\n| Arbitrary Program | | * All versions in major |\n| Execution | | releases other than |\n| Vulnerability | Linux, | 2.5.x and 3.0.x. |\n| | Apple | * 2.5.x releases prior |\n| | MacOS X | to 2.5.3041 |\n| | | * 3.0.x releases prior |\n| | | to 3.0.629 |\n|-------------------+-----------+----------------------------|\n| | Microsoft | All versions prior to |\n| Local Privilege | Windows | 2.3.254 |\n|Escalation |-----------+----------------------------|\n| Vulnerability | Linux, | |\n| | Apple | Not affected |\n| | MacOS X | |\n+------------------------------------------------------------+\n\nNote: Microsoft Windows Mobile versions are affected by the Arbitrary\nProgram Execution Vulnerability. \n\nNo other Cisco products are currently known to be affected by these\nvulnerabilities. An attacker could\ncreate a malicious web page that looks like the normal VPN web login\npage and entice a user, through social engineering or exploitation of\nother vulnerabilities, to visit it. This\narbitrary executable would be executed with the same operating system\nprivileges under which the web browser was run. Common\nVulnerabilities and Exposures (CVE) IDs CVE-2011-2039 (for\nCSCsy00904) and CVE-2011-2040 (for CSCsy05934) have been assigned for\nthese vulnerabilities. An attacker may\nengineer a web page to supply an affected version of the ActiveX\ncontrol or Java applet and still accomplish arbitrary program\nexecution because of the lack of authenticity validation. When this occurs, an\n old version of the ActiveX control will not be instantiated if\n one is presented for download. This\n action accomplishes the same result as the previous\n recommendation -- it deploys new, fixed versions of the ActiveX\n control so that old, vulnerable versions of the control are not\n instantiated if one is presented for download. This action prevents the\n ActiveX control from being instantiated under any scenario. \n Instructions for setting the kill bit are beyond the scope of\n this document; refer to the Microsoft Support article \"How to\n stop an ActiveX control from running in Internet Explorer\" at\n http://support.microsoft.com/kb/240797 and the Microsoft Security\n Vulnerability Research \u0026 Defense\u0027s \"Kill-Bit FAQ\" blog posts\n referenced in the Microsoft Support article for more information. Note that this CLSID\n did not change with new versions of the ActiveX control that\n implement code signing validation. \n\nMitigating the risk of old versions of the Java applet can be\naccomplished by blacklisting old, vulnerable versions using the Jar\nblacklist feature introduced with Java SE 6 Update 14. For\ninformation on the Jar blacklist feature refer to the Java SE 6\nUpdate 14 release notes, available at:\nhttp://www.oracle.com/technetwork/java/javase/6u14-137039.html\n\nThe jar files to be blacklisted are identified by the following SHA-1\nmessage digests:\n\n # 2.3.0254, 2.3.1003, 2.3.2016, 2.4.0202, 2.4.1012,\n # 2.5.0217, 2.5.1025, 2.5.2001, 2.5.2006, 2.5.2010,\n # 2.5.2011, 2.5.2014, 2.5.2017, 2.5.2018, 2.5.2019\n SHA1-Digest-Manifest : xmarT5s8kwnKRLxnCOoLUnxnveE=\n\n # 2.2.0133, 2.2.0136, 2.2.0140\n SHA1-Digest-Manifest : 2wXAWNws4uNdCioU1eoCOS4+J3o=\n\n # 2.0.0343, 2.1.0148\n SHA1-Digest-Manifest : OlNnvozFCxbJZbRfGiLckOE8uFQ=\n\n\nLocal Privilege Escalation Vulnerability\n+---------------------------------------\n\nUnprivileged users can elevate their privileges to those of the\nLocalSystem account by enabling the Start Before Logon (SBL) feature\nand interacting with the Cisco AnyConnect Secure Mobility Client\ngraphical user interface in the Windows logon screen. \n\nTo prevent this issue, fixed versions of the Cisco AnyConnect Secure\nMobility Client limit the amount of interaction that is possible in\nthe client\u0027s graphical user interface when it is displayed on the\nWindows logon screen. \n\nVulnerability Scoring Details\n+----------------------------\n\nCisco has provided 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\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:\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:\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\n* CSCsy00904 \u0026 CSCsy05934 - Arbitrary Program Execution Vulnerability\n\nCVSS Base Score - 7.6\n Access Vector - Network\n Access Complexity - High\n Authentication - None\n Confidentiality Impact - Complete\n Integrity Impact - Complete\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.3\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\n* CSCta40556 -- AnyConnect: Security issue with SBL on versions\nprior to 2.3\n\nCVSS Base Score - 7.2\n Access Vector - Local\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - Complete\n Integrity Impact - Complete\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.0\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\n\nImpact\n======\n\nArbitrary Program Execution Vulnerability\n+----------------------------------------\n\nExploitation of this vulnerability may allow an attacker to execute\narbitrary programs on the computer of a Cisco AnyConnect Secure\nMobility Client user with the privileges of the user who is\nestablishing the VPN connection. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult:\nhttp://www.cisco.com/go/psirt \nand any subsequent advisories to determine exposure and a complete\nupgrade 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\n+------------------------------------------------------------+\n| Vulnerability | Platform | First Fixed |\n| | | Release |\n|----------------------------+---------------+---------------|\n| | Microsoft | 2.3.185 |\n| Arbitrary Program | Windows | |\n|Execution Vulnerability |---------------+---------------|\n| | Linux, Apple | 2.5.3041 and |\n| | Mac OS X | 3.0.629 |\n|----------------------------+---------------+---------------|\n| | Microsoft | 2.3.254 |\n| Local Privilege Escalation | Windows | |\n|Vulnerability |---------------+---------------|\n| | Linux, Apple | Not affected |\n| | Mac OS X | |\n+------------------------------------------------------------+\n\nRecommended Releases\n\nThe following table lists all recommended releases. These recommended\nreleases contain the fixes for all vulnerabilities in this advisory. \nCisco recommends upgrading to a release that is equal to or later\nthan these recommended releases. \n\nWorkarounds\n===========\n\nThere are no workarounds for the vulnerabilities that are described\nin this advisory. \n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address these\nvulnerabilities. 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/en/US/docs/general/warranty/English/EU1KEN_.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:\nhttp://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html\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. Cisco would like to\nthank iDefense for reporting this vulnerability and for working with\nus towards a coordinated disclosure of the vulnerability. \n\nThe Local Privilege Escalation Vulnerability was reported to Cisco by\na customer. \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-20110601-ac.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 | 2011-June-01 | 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 security notices. \nAll Cisco security advisories are available at:\nhttp://www.cisco.com/go/psirt\n\n+--------------------------------------------------------------------\nCopyright 2010-2011 Cisco Systems, Inc. All rights reserved. \n+--------------------------------------------------------------------\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.9 (Darwin)\n\niF4EAREIAAYFAk3mbJUACgkQQXnnBKKRMNBBxAD+Oh7XQCOtCDOFCY8K1hWFAV/K\niwgK2hG+GNV39PPndfQA/0Sked3glEypuwev05ULO4ukTAPoDI5CJLnb4W4TKjL8\n=pAlh\n-----END PGP SIGNATURE-----\n. ----------------------------------------------------------------------\n\n\nJoin Secunia @ FIRST Conference, 12-17 June, Hilton Vienna, Austria\nSee to the presentation \"The Dynamics and Threats of End-Point Software Portfolios\" by Secunia\u0027s Research Analyst Director, Stefan Frei. \nRead more:\nhttp://conference.first.org/ \n\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco AnyConnect VPN Client Two Vulnerabilities\n\nSECUNIA ADVISORY ID:\nSA44812\n\nVERIFY ADVISORY:\nSecunia.com\nhttp://secunia.com/advisories/44812/\nCustomer Area (Credentials Required)\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=44812\n\nRELEASE DATE:\n2011-06-03\n\nDISCUSS ADVISORY:\nhttp://secunia.com/advisories/44812/#comments\n\nAVAILABLE ON SITE AND IN CUSTOMER AREA:\n * Last Update\n * Popularity\n * Comments\n * Criticality Level\n * Impact\n * Where\n * Solution Status\n * Operating System / Software\n * CVE Reference(s)\n\nhttp://secunia.com/advisories/44812/\n\nONLY AVAILABLE IN CUSTOMER AREA:\n * Authentication Level\n * Report Reliability\n * Secunia PoC\n * Secunia Analysis\n * Systems Affected\n * Approve Distribution\n * Remediation Status\n * Secunia CVSS Score\n * CVSS\n\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=44812\n\nONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:\n * AUTOMATED SCANNING\n\nhttp://secunia.com/vulnerability_scanning/personal/\nhttp://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/\n\nDESCRIPTION:\nTwo vulnerabilities have been reported in Cisco AnyConnect VPN\nClient, which can be exploited by malicious people with physical\naccess to bypass certain security restrictions and by malicious\npeople to compromise a user\u0027s system. \n\nSuccessful exploitation of this vulnerability requires the Start\nBefore Logon (SBL) feature to be enabled. \n\n2) An error in the helper application used for remote deployment of\nthe client (e.g. \n\nSOLUTION:\nUpdate to a fixed version (please see the vendor\u0027s advisory for\ndetails). \n\nPROVIDED AND/OR DISCOVERED BY:\n1) Reported to the vendor by a customer. \n2) The vendor credits Elazar Broad via iDefense. \n\nORIGINAL ADVISORY:\nCisco (cisco-sa-20110601-ac):\nhttp://www.cisco.com/warp/public/707/cisco-sa-20110601-ac.shtml\n\nOTHER REFERENCES:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nDEEP LINKS:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED DESCRIPTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED SOLUTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXPLOIT:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\nprivate users 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",
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Sightings
| Author | Source | Type | Date |
|---|
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.