The Cisco AnyConnect ActiveX control contains a buffer overflow vulnerability, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
Cisco AnyConnect is an SSL VPN solution that is commonly initiated through use of a web browser. When Internet Explorer is used, the AnyConnect VPN server provides an ActiveX control that downloads and installs the AnyConnect client software. One of the components provided by Cisco AnyConnect for use with Internet Explorer is an ActiveX control called the "CISCO Portforwarder Control." This ActiveX control is provided by the file ciscopf.ocx. The Cisco Portforwarder ActiveX control contains a buffer overflow in its initialization parameters. We have confirmed that version 126.96.36.199 of the Portforwarder control is vulnerable. Previous versions may also be affected.
By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code.
Apply an update
This issue is addressed in Cisco Security Advisory cisco-sa-20120314-asaclient. Please note that updating a Cisco ASA device with the fixed software will not protect systems that have already downloaded the vulnerable control. Please also consider the following workarounds:
This vulnerability was reported by Will Dormann of the CERT/CC
This document was written by Will Dormann.
|Date First Published:||2012-03-14|
|Date Last Updated:||2014-07-24 18:33 UTC|