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<?xml version="1.0" encoding="utf-8"?>
<glsa id="200608-12">
<title>x11vnc: Authentication bypass in included LibVNCServer code</title>
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.
<product type="ebuild">x11vnc</product>
<announced>August 07, 2006</announced>
<revised>August 07, 2006: 01</revised>
<package name="x11-misc/x11vnc" auto="yes" arch="*">
<unaffected range="ge">0.8.1</unaffected>
<vulnerable range="lt">0.8.1</vulnerable>
x11vnc provides VNC servers for X displays.
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 type="high">
An attacker could exploit 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 x11vnc users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=x11-misc/x11vnc-0.8.1&quot;</code>
<uri link="">CVE-2006-2450</uri>
<uri link="/security/en/glsa/glsa-200608-05.xml">GLSA-200608-05</uri>
<metadata tag="requester" timestamp="Sat, 05 Aug 2006 07:18:47 +0000">
<metadata tag="bugReady" timestamp="Sat, 05 Aug 2006 16:44:29 +0000">
<metadata tag="submitter" timestamp="Sat, 05 Aug 2006 17:17:11 +0000">