Check Point Advisories

LibVNCServer scale.c rfbSendNewScaleSize Use After Free

Check Point Reference: CPAI-2014-1977
Date Published: 6 Nov 2014
Severity: Critical
Last Updated: Sunday 14 December, 2014
Source: LibVNCServer
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? LibVNCServer Development Team LibVNCServer prior to 0.9.10
Vulnerability Description A use-after-free vulnerability has been found in LibVNCServer. The vulnerability is due to an issue with processing wrt scaling messages. A remote attacker can exploit this vulnerability by sending a wrt scaling message and terminating the connection before receiving server's response. Successful exploitation could lead to remote code execution under the security context of the server process.

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 LibVNCServer scale.c rfbSendNewScaleSize Use After Free 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:  Web Server Enforcement Violation.
Attack Information:  LibVNCServer scale.c rfbSendNewScaleSize Use After Free

×
  Feedback
This website uses cookies for its functionality and for analytics and marketing purposes. By continuing to use this website, you agree to the use of cookies. For more information, please read our Cookies Notice.
OK