GLSA 200608-05: LibVNCServer: Authentication bypass

http://security.gentoo.org/

Severity:	high
Title:	LibVNCServer: Authentication bypass
Date:	08/04/2006
Bugs:	#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	Vulnerable	Unaffected	Architecture(s)
net-libs/libvncserver	< 0.8.2	>= 0.8.2	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:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-libs/libvncserver-0.8.2"

References

CVE-2006-2450

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200608-05.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.