‘Cisco Secure Desktop CSDWebInstaller ActiveX Control Cleaner.cab Code Execution Vulnerability’

Summary

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Cisco Secure Desktop.’

Credit:

‘The original article can be found at: http://www.zerodayinitiative.com/advisories/ZDI-11-092/


Details

Vulnerable Systems:
 * Cisco Secure Desktop

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 within CSDWebInstaller.ocx. The CSDWebInstallerCtrl ActiveX control allows downloading and executing any Cisco-signed executable files. By renaming a Cisco-signed executable file to inst.exe and putting it on a webserver, an attacker can subsequently exploit vulnerabilities in the Cisco-signed executable file remotely.

Patch Availability:
Cisco states that they will have a patch for this issue on March 31st, 2011. In the meantime, we suggest users implement the mitigations below.

Workaround:
The killbit can be set on this control to disable scripting within Internet Explorer by modifying the data value of the Compatibilty Flags DWORD within the following location in the registry:

HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility705EC6D4-B138-4079-A307-EF13E4889A82

If the Compatibility Flags value is set to 0x00000400 the control can no longer be instantiated inside the browser. For more information, please see:
http://support.microsoft.com/kb/240797

CVE Information:
CVE-2011-0925

Disclosure Timeline:
2010-08-25 – Vulnerability reported to vendor
2011-02-28 – Coordinated public release of advisory’

Categories: Windows