Check Point Advisories

RealVNC VNC Server ClientCutText Message Memory Corruption

Check Point Reference: CPAI-2010-418
Date Published: 6 Jun 2010
Severity: High
Last Updated: Monday 19 November, 2018
Protection Provided by:

Security Gateway
R81, R80, R77, R75

Who is Vulnerable?
Vulnerability Description A memory corruption vulnerability has been reported in RealVNC VNC Server. The vulnerability is due to insufficient boundary checks by RealVNC when handling certain messages sent from RealVNC clients. A remote attackerscould exploit this issue by sending a crafted VNC command ot a target server. Successful exploitation of this vulnerability may lead to injection and execution of arbitrary code within the context of SYSTEM user on Windows systems and may result in abnormal termination of the VNC Server leading to a denial of service condition.

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 RealVNC VNC Server ClientCutText Message Memory Corruption 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:  RealVNC VNC Server ClientCutText Message Memory Corruption

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