[Full-disclosure] [ GLSA 200608-12 ] x11vnc: Authentication bypass in included LibVNCServer code

2006-08-08T00:00:00
ID SECURITYVULNS:DOC:13770
Type securityvulns
Reporter Securityvulns
Modified 2006-08-08T00:00:00

Description


Gentoo Linux Security Advisory GLSA 200608-12


                                        http://security.gentoo.org/

Severity: High Title: x11vnc: Authentication bypass in included LibVNCServer code Date: August 07, 2006 Bugs: #142559 ID: 200608-12


Synopsis

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.

Background

x11vnc provides VNC servers for X displays.

Affected packages

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 Package          /  Vulnerable  /                      Unaffected
-------------------------------------------------------------------

1 x11-misc/x11vnc < 0.8.1 >= 0.8.1

Description

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.

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 x11vnc users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=x11-misc/x11vnc-0.8.1&quot;

References

[ 1 ] CVE-2006-2450 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2450 [ 2 ] GLSA-200608-05 http://www.gentoo.org/security/en/glsa/glsa-200608-05.xml

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200608-12.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 http://bugs.gentoo.org.

License

Copyright 2006 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5