Rule

--
Sid
19651

--
Summary:
This event is generated when an attempt is made to exploit a known vulnerability in anyconnect secure mobility client.

--
Impact:
Denial of Service. Information disclosure. Loss of integrity. 

--
Detailed Information:
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.

--
Affected Systems:
cisco anyconnect secure mobility client 2.0
cisco anyconnect secure mobility client 2.1
cisco anyconnect secure mobility client 2.2
cisco anyconnect secure mobility client 2.2.128
cisco anyconnect secure mobility client 2.2.133
cisco anyconnect secure mobility client 2.2.136
cisco anyconnect secure mobility client 2.2.140
cisco anyconnect secure mobility client 2.3

--
Attack Scenarios:
An attacker can host a web site that will return code of their choosing to the object when a victim clicks on a malicious link.

--
Ease of Attack:
Medium.

--
False Positives:
None known.

--
False Negatives:
None known.

--
Corrective Action:
Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

--
Contributors:
Sourcefire Vulnerability Research Team
This document was generated from data supplied by the National Vulnerability Database. A product of the National Institute of Standards and Technology.
For more information see http://nvd.nist.gov/

--
Additional References:

NIST CVE-2011-2039:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-2039
 
Common Weakness Enumeration:
http://cwe.mitre.org/data/definitions/120.html
 
Common Attack Pattern Enumeration and Classification:
http://capec.mitre.org/data/definitions/100.html

--
