Joined: 12 May 2004
|Posted: Fri Aug 04, 2006 6:26 am Post subject: [ GLSA 200608-05 ] LibVNCServer: Authentication bypass
|Gentoo Linux Security Advisory
Title: LibVNCServer: Authentication bypass (GLSA 200608-05)
Date: August 04, 2006
VNC servers created with LibVNCServer accept insecure protocol types, even when the server does not offer it, resulting in unauthorized access to the server.
LibVNCServer is a GPL'ed library for creating VNC servers.
Vulnerable: < 0.8.2
Unaffected: >= 0.8.2
Architectures: All supported architectures
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.
An attacker could use 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 LibVNCServer users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=net-libs/libvncserver-0.8.2"