(Gentoo Describes Workaround for KDE kfax) LibTIFF Buffer Overflows May Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1012614 |
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SecurityTracker URL: http://securitytracker.com/id/1012614
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CVE Reference:
CAN-2004-0803
(Links to External Site)
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Date: Dec 19 2004
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Impact:
Execution of arbitrary code via network, User access via network
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Vendor Confirmed: Yes
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Description:
Some buffer overflow vulnerabilities were reported in LibTIFF. A remote user may be able to execute arbitrary code on the target user's system. KDE kfax is affected.
Gentoo reported that a remote user may be able to create a specially crafted image file that, when processed by the library, will execute arbitrary code with the privileges of the target user.
Chris Evans is credited with discovering these flaws.
The flaws reside in the RLE decoding routines in tif_next.c, tif_thunder.c, and potentially tif_luv.c.
Some demonstration exploit TIFFs are available at:
http://scary.beasts.org/misc/bad_next.tiff
http://scary.beasts.org/misc/bad_thunder.tiff
The original advisory is available at:
http://scary.beasts.org/security/CESA-2004-006.txt
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Impact:
A remote user can create TIFF files that, when loaded by the target library, will execute arbitrary code.
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Solution:
Gentoo indicates that a fix is not available and that the KDE Team recommends that you remove the kfax binary as well as the kfaxpart.la KPart:
rm /usr/kde/3.*/lib/kde3/kfaxpart.la
rm /usr/kde/3.*/bin/kfax
This workaround will disable kfax.
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Cause:
Boundary error
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Underlying OS:
Linux (Gentoo)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Sun, 19 Dec 2004 20:15:53 +0100
Subject: [gentoo-announce] [ GLSA 200412-17 ] kfax: Multiple overflows in the included TIFF library
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Gentoo Linux Security Advisory GLSA 200412-17
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http://security.gentoo.org/
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Severity: Normal
Title: kfax: Multiple overflows in the included TIFF library
Date: December 19, 2004
Bugs: #73795
ID: 200412-17
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Synopsis
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kfax contains several buffer overflows potentially leading to execution
of arbitrary code.
Background
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KDE is a feature-rich graphical desktop environment for Linux and
Unix-like Operating Systems. kfax (part of kdegraphics) is the KDE fax
file viewer.
Affected packages
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Package / Vulnerable / Unaffected
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1 kde-base/kdegraphics < 3.3.1 Vulnerable!
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Description
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Than Ngo discovered that kfax contains a private copy of the TIFF
library and is therefore subject to several known vulnerabilities (see
References).
Impact
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A remote attacker could entice a user to view a carefully-crafted TIFF
image file with kfax, which would potentially lead to execution of
arbitrary code with the rights of the user running kfax.
Workaround
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The KDE Team recommends to remove the kfax binary as well as the
kfaxpart.la KPart:
rm /usr/kde/3.*/lib/kde3/kfaxpart.la
rm /usr/kde/3.*/bin/kfax
Note: This will render the kfax functionality useless, if kfax
functionality is needed you should upgrade to the KDE 3.3.2 which is
not stable at the time of this writing.
Resolution
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All kfax users should use the workaround as no patches are available
yet.
References
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[ 1 ] KDE Security Advisory: kfax libtiff vulnerabilities
http://www.kde.org/info/security/advisory-20041209-2.txt
[ 2 ] GLSA 200410-11
http://www.gentoo.org/security/en/glsa/glsa-200410-11.xml
[ 3 ] CAN-2004-0803
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCAN-2004-0803
[ 4 ] CAN-2004-0804
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCAN-2004-0804
[ 5 ] CAN-2004-0886
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCAN-2004-0886
Availability
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This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200412-17.xml
Concerns?
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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
http://bugs.gentoo.org.
License
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Copyright 2004 Gentoo Foundation, 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/2.0
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