Gentoo: GLSA-200407-05: XFree86, X.org: XDM ignores requestPort setting
Summary
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Gentoo Linux Security Advisory GLSA 200407-05 https://security.gentoo.org/
Severity: Low Title: XFree86, X.org: XDM ignores requestPort setting Date: July 05, 2004 Bugs: #53226 ID: 200407-05
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 It has largely been superseded by programs such as GDM and KDM.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. -------------------------------------------------------------------
========== 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
Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/200407-05
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 https://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.
https://creativecommons.org/licenses/by-sa/1.0/
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Resolution
References
Availability
Concerns
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