Vulnerability Alert

Cisco AnyConnect Secure Mobility Client VPNAPI COM Buffer Overflow Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:31606
Version:1
First Published:2013 November 04 18:25 GMT
Last Published:2013 November 04 18:25 GMT
Port: Not available
CVE:CVE-2013-5559
BugTraq ID:63491
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.6
 
Version Summary:Cisco AnyConnect Secure Mobility Client contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands with the privilege of the user executing the web browser. Updates are available.
 
 
Description
A vulnerability in the Active Template Library (ATL) framework used by a component of the Cisco AnyConnect Secure Mobility Client could allow an unauthenticated, remote attacker to execute arbitrary commands with the privilege of the user executing the web browser.

The vulnerability is due to insufficient input validation when the ATL framework is called by the VPNAPI COM module. An attacker could exploit this vulnerability by persuading the a user with the Cisco AnyConnect Secure Mobility Client to visit a crafted HTML page. An exploit could allow the attacker to create a buffer overflow condition and possibly execute arbitrary code. Arbitrary code injection is theoretical and has not been proven.

Note: The COM component is not marked safe for scripting or initialization; therefore, a user would be prompted multiple times before the control would load.

Depending on the device operating system where Cisco AnyConnect Secure Mobility Client is installed, the command execution will be performed with the privilege of the user accessing the malicious HTML. This vulnerability affects Cisco AnyConnect Secure Mobility Client version 2.x only. Cisco AnyConnect Secure Mobility Client 3.x is not affected.

Cisco would like to thank Alex Nikitin and Jarrod Johnson from Ixia BreakingPoint for reporting this vulnerability.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
This vulnerability affects Cisco AnyConnect Secure Mobility Client version 2.x only. Cisco AnyConnect Secure Mobility Client 3.x is not affected.
 
IntelliShield Analysis
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security notice at the following link: CVE-2013-5559

Customers are advised to consult Cisco bug ID CSCuj58139 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to create a buffer overflow condition and possibly execute arbitrary code. A successful exploit could be leveraged to conduct further attacks.
 
Technical Information
The vulnerability is due to insufficient input validation when the ATL framework is called by the VPNAPI COM module.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user with the Cisco AnyConnect Secure Mobility Client to visit a crafted HTML page. An exploit could allow the attacker to create a buffer overflow condition and possibly execute arbitrary code.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco AnyConnect Secure Mobility Client 2.0 .0343 | 2.1 .0148 | 2.2 .0133, .0136, .0140 | 2.3 .0185, .0254, .1003, .2016 | 2.4 .0202, .1012 | 2.5 Base, .0217, .2006, .2010, .2011, .2014, .2017, .2018, .2019, .3041, .3046, .3051, .3054, .3055

Associated Products:
N/A




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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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