[ GLSA 200608-05 ] LibVNCServer: Authentication bypass

[GLSA]

Gentoo Linux Security Advisory

Title: LibVNCServer: Authentication bypass (GLSA 200608-05)
Severity: high
Exploitable: remote
Date: August 04, 2006
Bug(s): #136916
ID: 200608-05

Synopsis


VNC servers created with LibVNCServer accept insecure protocol types, even
when the server does not offer it, resulting in unauthorized access to the
server.


Background


LibVNCServer is a GPL'ed library for creating VNC servers.


Affected Packages

Package: net-libs/libvncserver
Vulnerable: < 0.8.2
Unaffected: >= 0.8.2
Architectures: All supported architectures


Description


LibVNCServer fails to properly validate protocol types effectively
letting users decide what protocol to use, such as "Type 1 - None".
LibVNCServer will accept this security type, even if it is not offered
by the server.


Impact


An attacker could use this vulnerability to gain unauthorized access
with the privileges of the user running the VNC server.


Workaround


There is no known workaround at this time.


Resolution


All LibVNCServer users should upgrade to the latest version: