GLSA Bodhisattva
Joined: 13 Jun 2003 Posts: 4087 Location: Dresden, Germany
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Posted: Mon Jul 05, 2004 8:43 pm Post subject: [ GLSA 200407-05 ] XFree86, X.org: XDM ignores requestPort s |
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Gentoo Linux Security Advisory
Title: XFree86, X.org: XDM ignores requestPort setting (GLSA 200407-05)
Severity: low
Exploitable: remote
Date: July 05, 2004
Bug(s): #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 It has largely been superseded by programs such as GDM and KDM.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: x11-base/xfree
Vulnerable: <= 4.3.0-r5
Unaffected: >= 4.3.0-r6
Architectures: All supported architectures
Package: x11-base/xorg-x11
Vulnerable: <= 6.7.0
Unaffected: >= 6.7.0-r1
Architectures: All 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: Code: | # 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: Code: | # emerge sync
# emerge -pv ">=x11-base/xorg-x11-6.7.0-r1"
# emerge ">=x11-base/xorg-x11-6.7.0-r1" |
References
CAN 2004-0419
XFree86 Bug
Last edited by GLSA on Sun May 07, 2006 4:51 pm; edited 1 time in total |
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