TippingPoint Zero Day Initiative
 

Cisco AnyConnect VPN Client Verification Bypass Remote Code Execution Vulnerability

ZDI-12-149: August 22nd, 2012

CVE ID

CVSS Score

Affected Vendors

Affected Products

    AnyConnect VPN Client

Vulnerability Details


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Cisco AnyConnect VPN Client. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists because the VPN AnyConnect helper program does not check the version number of the vpndownloader.exe program it downloads. As such it is possible to forcefully install an older version of the vpndownloader.exe that is vulnerable to previously patched issues.

Vendor Response

Cisco has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2011-11-22 - Vulnerability reported to vendor
    2012-08-22 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    gwslabs.com