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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200407-05">
<title>XFree86, X.org: XDM ignores requestPort setting</title>
<synopsis>
XDM will open TCP sockets for its chooser, even if the
DisplayManager.requestPort setting is set to 0. This may allow authorized
users to access a machine remotely via X, even if the administrator has
configured XDM to refuse such connections.
</synopsis>
<product type="ebuild">xdm</product>
<announced>July 05, 2004</announced>
<revised>July 05, 2004: 01</revised>
<bug>53226</bug>
<access>remote</access>
<affected>
<package name="x11-base/xfree" auto="yes" arch="*">
<unaffected range="ge">4.3.0-r6</unaffected>
<vulnerable range="le">4.3.0-r5</vulnerable>
</package>
<package name="x11-base/xorg-x11" auto="yes" arch="*">
<unaffected range="ge">6.7.0-r1</unaffected>
<vulnerable range="le">6.7.0</vulnerable>
</package>
</affected>
<background>
<p>
The X Display Manager (XDM) is a program which provides a graphical login
prompt to users on the console or on remote X terminals. It has largely
been superseded by programs such as GDM and KDM.
</p>
</background>
<description>
<p>
XDM will open TCP sockets for its chooser, even if the
DisplayManager.requestPort setting is set to 0. Remote clients can use this
port to connect to XDM and request a login window, thus allowing access to
the system.
</p>
</description>
<impact type="low">
<p>
Authorized users may be able to login remotely to a machine running XDM,
even if this option is disabled in XDM's configuration. Please note that an
attacker must have a preexisting account on the machine in order to exploit
this vulnerability.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time. All users should upgrade to the
latest available version of X.
</p>
</workaround>
<resolution>
<p>
If you are using XFree86, you should run the following:
</p>
<code>
# emerge sync
# emerge -pv ">=x11-base/xfree-4.3.0-r6"
# emerge ">=x11-base/xfree-4.3.0-r6"</code>
<p>
If you are using X.org's X11 server, you should run the following:
</p>
<code>
# emerge sync
# emerge -pv ">=x11-base/xorg-x11-6.7.0-r1"
# emerge ">=x11-base/xorg-x11-6.7.0-r1"</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0419">CAN 2004-0419</uri>
<uri link="http://bugs.xfree86.org/show_bug.cgi?id=1376">XFree86 Bug</uri>
</references>
<metadata tag="submitter">
condordes
</metadata>
</glsa>