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Real VNC: User-assisted execution of arbitrary code


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


Real VNC is a remote desktop viewer display system.


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.


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


There is no known workaround at this time.


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


Page updated March 09, 2009

Summary: This is a Gentoo Linux Security Advisory

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