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.
CVSS Severity (version 2.0):
Impact Subscore: 10.0
Exploitability Subscore: 4.9
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: High
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
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US-CERT Vulnerability Note:
20110601 Cisco AnyConnect VPN Client Arbitrary Program Execution Vulnerability
20110601 Multiple Vulnerabilities in Cisco AnyConnect Secure Mobility Client