UltraVNC DLL Loading Arbitrary Code Execution Vulnerability

Bugtraq ID:	42846
Class:	Design Error
CVE:
Remote:	Yes
Local:	No
Published:	Aug 30 2010 12:00AM
Updated:	Oct 11 2010 04:19PM
Credit:	Ivan Markovic
Vulnerable:	UltraVNC UltraVNC 1.0.8.2
Not Vulnerable:

UltraVNC DLL Loading Arbitrary Code Execution Vulnerability

UltraVNC is prone to a vulnerability that lets attackers execute arbitrary code.

An attacker can exploit this issue by enticing a legitimate user to use the vulnerable application to open a file from a network share location that contains a specially crafted Dynamic Link Library (DLL) file.

UltraVNC 1.0.8.2 is vulnerable; other versions may be affected.

UltraVNC DLL Loading Arbitrary Code Execution Vulnerability

A general exploit technique has been documented by TheLeader and H.D. Moore for the Metasploit Project; please see the references for more information.

The following exploit code is available:

• /data/vulnerabilities/exploits/42846.c

UltraVNC DLL Loading Arbitrary Code Execution Vulnerability

Solution:
Currently we are not aware of any vendor-supplied patches. If you feel we are in error or are aware of more recent information, please mail us at: [email protected].

UltraVNC DLL Loading Arbitrary Code Execution Vulnerability

References:

• Application DLL Load Hijacking (HD Moore)
  
• Exploiting DLL Hijacking Flaws (hdm)
  
• Microsoft Security Advisory 2269637 Released (Microsoft)
  
• More information about the DLL Preloading remote attack vector (Microsoft)
  
• UltraVNC Home Page (UltraVNC)
  
• Microsoft Security Advisory (2269637) (Microsoft)