Check Point Advisories

UltraVNC VNCViewer Authenticate Buffer Overflow (CVE-2009-0388)

Check Point Reference: CPAI-2009-374
Date Published: 11 Oct 2009
Severity: High
Last Updated: Tuesday 27 December, 2011
Source:
Industry Reference:CVE-2009-0388
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Virtual Network Computing (VNC) is a graphical desktop sharing technology that uses the Remote Frame Buffer (RFB) protocol to remotely control another computer. The controller computer (client or viewer) sends keyboard and mouse events to the controlled computer (server); the controlled computer sends graphical screen updates to the controller machine. RFB is usually carried over TCP port 5900. There exist a buffer overflow vulnerability in multiple Virtual Network Computing (VNC) based applications. The flaw is due to improper validation of length value in network message. A remote attacker might trigger this vulnerability by persuading the target user to connect to a malicious VNC server. In an attack case where code injection is successful, the behaviour of the target is entirely dependent on the intended function of the injected code. The code in such a case would execute within the security context of the logged in user. In an attack case where code injection is not successful, the affected application will terminate abnormally.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the UltraVNC VNCViewer Authenticate Buffer Overflow protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  RDP Enforcement Violation.
Attack Information:  UltraVNC VNCViewer authenticate buffer overflow

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