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Vigil@nce: RealVNC, vulnerability of VNC Viewer

October 2008 by Vigil@nce

SYNTHESIS

An attacker can create a malicious VNC server and invite the victim to connect to it with VNC Viewer in order to execute code on the computer.

Gravity: 2/4

Consequences: user access/rights

Provenance: intranet server

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 20/10/2008

IMPACTED PRODUCTS

- RealVNC

DESCRIPTION

The RealVNC product is composed of two modules:
- VNC Server: to be installed on the computer to administer
- VNS Viewer: to be installed on the client

The CMsgReader::readRect() function of the common/rfb/CMsgReader.cxx file, used in VNC Viewer, does not correctly check received messages.

An attacker can therefore create a malicious VNC server and invite the victim to connect to it with VNC Viewer in order to execute code on the computer.

CHARACTERISTICS

Identifiers: BID-31832, VIGILANCE-VUL-8186

http://vigilance.aql.fr/vulnerability/8186




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