Date: Mon, 05 Jul 2004 22:39:58 +0200
From: Thierry Carrez <[email protected]>
To: [email protected]Subject: [ GLSA 200407-05 ] XFree86, X.org: XDM ignores requestPort setting
Cc: [email protected], [email protected],
[email protected]
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Gentoo Linux Security Advisory GLSA 200407-05
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http://security.gentoo.org/
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Severity: Low
Title: XFree86, X.org: XDM ignores requestPort setting
Date: July 05, 2004
Bugs: #53226
ID: 200407-05
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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.
Background
==========
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largely been superseded by programs such as GDM and KDM.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 x11-base/xfree <= 4.3.0-r5 >= 4.3.0-r6
2 x11-base/xorg-x11 <= 6.7.0 >= 6.7.0-r1
-------------------------------------------------------------------
2 affected packages on all of their supported architectures.
-------------------------------------------------------------------
Description
===========
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.
Impact
======
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.
Workaround
==========
There is no known workaround at this time. All users should upgrade to
the latest available version of X.
Resolution
==========
If you are using XFree86, you should run the following:
# emerge sync
# emerge -pv ">=x11-base/xfree-4.3.0-r6"
# emerge ">=x11-base/xfree-4.3.0-r6"
If you are using X.org's X11 server, you should run the following:
# emerge sync
# emerge -pv ">=x11-base/xorg-x11-6.7.0-r1"
# emerge ">=x11-base/xorg-x11-6.7.0-r1"
References
==========
[ 1 ] CAN 2004-0419
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0419
[ 2 ] XFree86 Bug
http://bugs.xfree86.org/show_bug.cgi?id=1376
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200407-05.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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2004 Gentoo Technologies, 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/1.0
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