Check Point Advisories

LibVNCServer rfbProcessClientNormalMessage msg.ssc.scale Divide by Zero Denial of Service (CVE-2014-6054)

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1903
Date Published:	13 Oct 2014
Severity:	High
Last Updated:	Monday 20 October, 2014
Source:	LibVNCServer 05a9bd41a
Industry Reference:	CVE-2014-6054
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	LibVNCServer Development Team LibVNCServer 0.9.9 and prior
Vulnerability Description	A denial of service vulnerability exists in LibVNCserver. The vulnerability is due to a division by zero when processing an rfbSetScale message. A remote authenticated attacker can exploit this vulnerability by sending a specially crafted RFB message to the server.

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

In the IPS tab, click Protections and find the LibVNCServer rfbProcessClientNormalMessage msg.ssc.scale Divide by Zero Denial of Service protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Server Enforcement Violation.
Attack Information: LibVNCServer rfbProcessClientNormalMessage msg.ssc.scale Divide by Zero Denial of Service