Real VNC: User-assisted execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200903-17 / vnc
Release Date	March 09, 2009
Latest Revision	March 09, 2009: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/vnc	< 4.1.3	>= 4.1.3	All supported architectures

Related bugreports: #255225

Synopsis

The Real VNC client is vulnerable to execution of arbitrary code when connecting to a malicious server.

2. Impact Information

Background

Real VNC is a remote desktop viewer display system.

Description

An unspecified vulnerability has been discovered int the CMsgReader::readRect() function in the VNC Viewer component, related to the encoding type of RFB protocol data.

Impact

A remote attacker could entice a user to connect to a malicious VNC server, or leverage Man-in-the-Middle attacks, to cause the execution of arbitrary code with the privileges of the user running the VNC viewer.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Real VNC users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/vnc-4.1.3"

4. References

CVE-2008-4770

Page updated March 09, 2009

Summary: This is a Gentoo Linux Security Advisory

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