Cisco AnyConnect VPN Client Arbitrary Program Instantiation Remote Code Execution VulnerabilityZDI-12-156: August 22nd, 2012
AnyConnect VPN Client
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 due to insufficient signature checks with the Cisco AnyConnect VPN Client. When the client is invoked through the ActiveX control it downloads and checks a file called vpndownloader.exe. This file has to be properly signed by Cisco. Once this file is downloaded it is run and downloads additional configuration files. Within the downloaded config file it is possible to force a download of executable files. Those files are not properly checked for valid certificates and are run on the host as soon as they are downloaded.
Vendor ResponseCisco has issued an update to correct this vulnerability. More details can be found at:
2011-11-22 - Vulnerability reported to vendor
2012-08-22 - Coordinated public release of advisory
CreditThis vulnerability was discovered by: