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Vulnerability Alert

Cisco AnyConnect Secure Mobility Client Software Downgrade Vulnerability

 
Threat Type:CWE: Design Error
IntelliShield ID:26197
Version:2
First Published:2012 June 20 17:16 GMT
Last Published:2012 August 23 13:34 GMT
Port: Not available
CVE:CVE-2012-2494
BugTraq ID:54108
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.6
 
Version Summary:Additional technical information for the Cisco AnyConnect Secure Mobility Client software downgrade vulnerability is publicly available.
 
 
Description
Cisco AnyConnect Secure Mobility Client contains a vulnerability that could allow an unauthenticated, remote attacker to replace software components.

The vulnerability is due to improper sanitization of user-supplied input by the affected software's download feature. An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to view a malicious website. If successful, the attacker could cause the affected software to download and install an older version of the software.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco AnyConnect Secure Mobility Client versions prior to 2.5 MR6 and 3.0 MR8 are vulnerable.
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCtw48681 at the following link: cisco-sa-20120620-ac
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to replace software components with an older version, affecting application functionality or introducing additional vulnerabilities.
 
Technical Information
The vulnerability exists in the vpndownloader.exe implementation in the WebLaunch feature of the affected software. The software fails to verify the version number of the vpndownloader.exe program it downloads.

An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to view a malicious website. Processing input supplied by the malicious website could cause the software to download and install an older, signed version of the affected software. The vulnerability can be exploited by using either an ActiveX or a Java component that could offer signed code to match an older version of the software. The installation of an older version of the software could invalidate current configurations, change functionality, and introduce vulnerabilities that may be present in older versions of the software.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.

Administrators are advised to monitor affected systems.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20120620-ac
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
 
Alert History
 
Version 1, June 20, 2012, 1:16 PM: Cisco AnyConnect Secure Mobility Client contains a vulnerability that could allow an unauthenticated, remote attacker to replace software components. Updates are available.


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco AnyConnect Secure Mobility Client 2.5 Base, .0217, .2006, .2010, .2011, .2014, .2017, .2018, .2019, .3041, .3046, .3051, .3054, .3055 | 3.0 Base, .0629, .1047, .2052, .3050, .3054, .4235, .5075, .5080

Associated Products:
N/A




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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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