[KDE security advisory] Multiple integer overflows in kpdf

From: Dirk Mueller (mueller_at_kde.org)
Date: 10/22/04

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    To: kde-announce@kde.org
Date: Fri, 22 Oct 2004 12:00:28 +0200

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

    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:

            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. 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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