Advisory Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of 3S Pocketnet Tech VMS. 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 the PocketNetNVRMediaClientAxCtrl.NVRMediaViewer.1 control. The SaveCurrentImageEx method copies an attacker provided filename into a fixed size stack buffer. An attacker could leverage this to execute arbitrary code in the context of the browser.

This vulnerability is being disclosed publicly without a patch in accordance with the ZDI vulnerability disclosure policy on lack of vendor response.

Vendor Contact Timeline:
08/13/2014 - ZDI emailed the vendor requesting a contact and PGP key
09/04/2014 - ZDI emailed the vendor requesting a contact and PGP key
10/13/2014 - ZDI emailed the vendor requesting a contact and PGP key
11/05/2014 - ZDI emailed ICS-CERT requesting a contact or guidance
11/21/2014 - ZDI emailed ICS-CERT requesting a contact or guidance

-- Mitigation:
The killbit can be set on this control to disable scripting within Internet Explorer by modifying the data value of the Compatibility Flags DWORD within the following location in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\3075736A-FC03-452E-B155-721A1C2E9BCE
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

• 2014-08-13 - Vulnerability reported to vendor
• 2014-12-04 - Coordinated public release of advisory