KDE Security Advisory: Multiple integer overflows in kpdf
Posted on: 12/31/2004 07:53 PM

KDE Security Advisory: kpdf integer overflows
Original Release Date: 2004-10-21
URL: http://www.kde.org/info/security/advisory-20041021-1.txt

Chris Evans notified the KDE security team about multiple integer overflow and integer arithmetic flaws in xpdf 3.0. These flaws, if exploited, can cause xpdf (and therefore kpdf) to hang using 100% CPU, crash the viewer or corrupt the program heaproblem:
Chris Evans notified the KDE security team about multiple integer overflow and integer arithmetic flaws in xpdf 3.0. These flaws, if exploited, can cause xpdf (and therefore kpdf) to hang using 100% CPU, crash the viewer or corrupt the program heap.


0. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0888
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0889
CESA-2004-002 - rev 1
CESA-2004-007 - rev 1
1. Systems affected:
All KDE 3.2.x releases, KDE 3.3.0 and KDE 3.3.1.

2. Overview:
. It might be possible to execute arbitrary code. The Common Vulnerabilities and Exposures project assigned CAN-2004-0889 to this issue.

kpdf, the KDE pdf viewer, shares code with xpdf 2.02. This code is significantly different from the xpdf 3.0 codebase,
but is also affected by similiar issues. Sebastian Krahmer from the SUSE security team developed a patch that corrects integer overflows in the XRef code. This patch is made available below for kpdf as shipped in the KDE 3.2.x releases. The Common Vulnerabilities and Exposures project assigned CAN-2004-0888 to this issue.

KDE 3.3.1 contains a kpdf based on xpdf 3.0. We're providing a patch to fix the remaining integer overflows in this code base.

3. Impact:
Remotely supplied pdf files can be used to execute arbitrary code on the client machine.

4. Solution:
Source code patches have been made available which fix these vulnerabilities. Contact your OS vendor / binary package provider for information about how to obtain updated binary packages.

5. Patch:
Patch for KDE 3.2.3 is available from ftp://ftp.kde.org/pub/kde/security_patches : 4f854adb507f4d04e997702e44ffc2ea post-3.2.3-kdegraphics.diff

Patch for KDE 3.3.1 is available from
ftp://ftp.kde.org/pub/kde/security_patches :
651fba579516ea947fbefee373f40a6c post-3.3.1-kdegraphics.diff


6. Time line and credits:

01/09/2004 KDE Security Team alerted by Chris Evans
08/09/2004 Chris Evans finds similiar issues in the xpdf 2.02
codebase which is used by all released kpdf versions.
24/09/2004 Patch to fix the found issues in xpdf 2.02 developed
by Sebastian Krahmer of SUSE security.
12/10/2004 KDE 3.3.1 release upgrading kpdf to xpdf 3.0 codebase
21/10/2004 Public disclosure






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