x11vnc: Authentication bypass in included LibVNCServer code
Gentoo Linux Security Advisory
||GLSA 200608-12 / x11vnc
||August 07, 2006
||August 07, 2006: 01
All supported architectures
VNC servers created with x11vnc accept insecure protocol types, even when
the server does not offer it, resulting in the possibility of unauthorized
access to the server.
x11vnc provides VNC servers for X displays.
x11vnc includes vulnerable LibVNCServer code, which fails to properly
validate protocol types effectively letting users decide what protocol
to use, such as "Type 1 - None" (GLSA-200608-05). x11vnc will accept
this security type, even if it is not offered by the server.
An attacker could exploit this vulnerability to gain unauthorized
access with the privileges of the user running the VNC server.
There is no known workaround at this time.
All x11vnc users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=x11-misc/x11vnc-0.8.1"