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Gentoo Linux Security Advisory GLSA 200407-05 |
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http://security.gentoo.org/ |
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|
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Severity: Low |
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Title: XFree86, X.org: XDM ignores requestPort setting |
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Date: July 05, 2004 |
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Bugs: #53226 |
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ID: 200407-05 |
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Synopsis |
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======== |
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|
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XDM will open TCP sockets for its chooser, even if the |
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DisplayManager.requestPort setting is set to 0. This may allow |
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authorized users to access a machine remotely via X, even if the |
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administrator has configured XDM to refuse such connections. |
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|
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Background |
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========== |
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|
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The X Display Manager (XDM) is a program which provides a graphical |
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login prompt to users on the console or on remote X terminals. It has |
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largely been superseded by programs such as GDM and KDM. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 x11-base/xfree <= 4.3.0-r5 >= 4.3.0-r6 |
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2 x11-base/xorg-x11 <= 6.7.0 >= 6.7.0-r1 |
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------------------------------------------------------------------- |
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2 affected packages on all of their supported architectures. |
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------------------------------------------------------------------- |
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|
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Description |
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=========== |
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|
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XDM will open TCP sockets for its chooser, even if the |
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DisplayManager.requestPort setting is set to 0. Remote clients can use |
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this port to connect to XDM and request a login window, thus allowing |
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access to the system. |
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|
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Impact |
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====== |
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|
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Authorized users may be able to login remotely to a machine running |
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XDM, even if this option is disabled in XDM's configuration. Please |
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note that an attacker must have a preexisting account on the machine in |
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order to exploit this vulnerability. |
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|
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Workaround |
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========== |
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|
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There is no known workaround at this time. All users should upgrade to |
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the latest available version of X. |
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|
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Resolution |
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========== |
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|
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If you are using XFree86, you should run the following: |
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|
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# emerge sync |
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|
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# emerge -pv ">=x11-base/xfree-4.3.0-r6" |
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# emerge ">=x11-base/xfree-4.3.0-r6" |
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|
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If you are using X.org's X11 server, you should run the following: |
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|
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# emerge sync |
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|
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# emerge -pv ">=x11-base/xorg-x11-6.7.0-r1" |
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# emerge ">=x11-base/xorg-x11-6.7.0-r1" |
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|
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References |
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========== |
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|
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[ 1 ] CAN 2004-0419 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0419 |
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[ 2 ] XFree86 Bug |
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http://bugs.xfree86.org/show_bug.cgi?id=1376 |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200407-05.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2004 Gentoo Technologies, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/1.0 |
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