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DiamondCS Process Guard Can Be Disabled by Direct Service

by Donna Buenaventura / July 7, 2004 12:41 AM PDT

Table Restoration

Summary
DiamondCS Process Guard is "an advanced Win32 security system that protects both system and security processes (as well as user-defined processes) from attacks by other processes, services, drivers, and other forms of executing code on your system. The first program of its kind, Process Guard can protect a process against termination, suspension and prevents loading of malicious kernel drivers".

Process Guard protects a running process by hooking several native APIs in kernel-space. However, an implementation flaw allows a malicious program to disable Process Guard's protection by restoring the running kernel's SDT ServiceTable with direct writes to \device\physicalmemory.

Details
Vulnerable Systems:
* Process Guard Free version 2.000

Vendor response:
Vulnerability will be fixed in the next release.

Workarounds:
Do not run untrusted programs as Administrator.

Proof of concept:
http://www.security.org.sg/vuln/procguard.html

Disclosure timeline:
23 Jun 04 - Vulnerability Discovered
24 Jun 04 - Initial Vendor Notification
25 Jun 04 - Initial Vendor Response
07 Jul 04 - Public Release

More details - http://www.securiteam.com/windowsntfocus/5YP0120DFO.html

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