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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200608-12">
<title>x11vnc: Authentication bypass in included LibVNCServer code</title>
<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.
</synopsis>
<product type="ebuild">x11vnc</product>
<announced>August 07, 2006</announced>
<revised>August 07, 2006: 01</revised>
<bug>142559</bug>
<access>remote</access>
<affected>
<package name="x11-misc/x11vnc" auto="yes" arch="*">
<unaffected range="ge">0.8.1</unaffected>
<vulnerable range="lt">0.8.1</vulnerable>
</package>
</affected>
<background>
<p>
x11vnc provides VNC servers for X displays.
</p>
</background>
<description>
<p>
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.
</p>
</description>
<impact type="high">
<p>
An attacker could exploit this vulnerability to gain unauthorized
access with the privileges of the user running the VNC server.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All x11vnc users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=x11-misc/x11vnc-0.8.1&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2450">CVE-2006-2450</uri>
<uri link="/security/en/glsa/glsa-200608-05.xml">GLSA-200608-05</uri>
</references>
<metadata tag="requester" timestamp="Sat, 05 Aug 2006 07:18:47 +0000">
jaervosz
</metadata>
<metadata tag="bugReady" timestamp="Sat, 05 Aug 2006 16:44:29 +0000">
koon
</metadata>
<metadata tag="submitter" timestamp="Sat, 05 Aug 2006 17:17:11 +0000">
falco
</metadata>
</glsa>