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

http://security.gentoo.org/

Severity:	high
Title:	LTSP: Authentication bypass in included LibVNCServer code
Date:	03/18/2007
Bugs:	#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	Vulnerable	Unaffected	Architecture(s)
net-misc/ltsp	< 4.2-r1	>= 4.2-r1	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:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/ltsp-4.2-r1"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200703-19.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.