[ GLSA 200703-19 ] LTSP: Authentication bypass in included LibVNCServer code

[GLSA]

Gentoo Linux Security Advisory

Title: LTSP: Authentication bypass in included LibVNCServer code (GLSA 200703-19)
Severity: high
Exploitable: remote
Date: March 18, 2007
Bug(s): #142661
ID: 200703-19

Synopsis


LTSP includes a version of libVNCServer that is vulnerable to an
authentication bypass.


Background


The Linux Terminal Server Project adds thin-client support to Linux
servers.


Affected Packages

Package: net-misc/ltsp
Vulnerable: < 4.2-r1
Unaffected: >= 4.2-r1
Architectures: All supported architectures


Description


The LTSP server 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). The LTSP VNC
server will accept this security type, even if it is not offered by the
server.


Impact


An attacker could exploit 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 LTSP users should upgrade to the latest version: