iDEFENSE Security Advisory XX.XX.04 - Novell SuSe Linux LibTIFF Heap Overflow Vulnerability

From: customer service mailbox (customerservice_at_idefense.com)
Date: 10/22/04

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    Date: Fri, 22 Oct 2004 13:34:48 -0400
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    Novell SuSe Linux LibTIFF Heap Overflow Vulnerability

    iDEFENSE Security Advisory 10.22.04
    www.idefense.com/application/poi/display?id=154&type=vulnerabilities
    October 22, 2004

    I. BACKGROUND

    libtiff provides support for using the Tag Image File Format (TIFF), a
    widely used format for storing image data.

    II. DESCRIPTION

    An exploitable heap overflow in the handling of malformed tiff files has
    been discovered in the latest version of libtiff when JPEG support has
    been enabled.

    The overflow occurs in the OJPEGVSetField() function of
    libtiff/tif_ojpeg.c. During processing, it is assumed that more than 255
    bytes will not be processed, however in certain cases it is possible to
    cause up to 16 times that amount of data to be processed, thus causing
    the overflow.

    III. ANALYSIS

    An attacker can exploit the above-described vulnerability to execute
    arbitrary code under the permissions of the target user. Successful
    exploitation requires that the attacker convince the end-user to open
    the malicious tiff file using an application linked with a vulnerable
    version of libtiff.

    IV. DETECTION

    iDEFENSE has confirmed the existence of this vulnerability in version
    3.6.1 of libtiff when compiled with optional OJPEG_SUPPORT. This option
    is enabled by default under SuSE Linux 9.1 Personal and Suse Linux 9.1
    Professional.

    V. WORKAROUND

    Only open files from trusted users. Alternatively, recompile libtiff
    without the optional OJPEG_SUPPORT.

    VI. VENDOR RESPONSE

    This issue is addressed in SUSE-SA:2004:038

       http://www.suse.de/de/security/2004_38_libtiff.html

    VII. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    names CAN-2004-0929 to these issues. This is a candidate for inclusion
    in the CVE list (http://cve.mitre.org), which standardizes names for
    security problems.

    VIII. DISCLOSURE TIMELINE

    09/09/2004 Initial vendor notification
    09/09/2004Vendor response
    10/22/2004Coordinated public disclosure

    IX. CREDIT

    Andrei Nigmatulin is credited with this discovery.

    Get paid for vulnerability research
    http://www.idefense.com/poi/teams/vcp.jsp

    X. LEGAL NOTICES

    Copyright 2004 iDEFENSE, Inc.

    Permission is granted for the redistribution of this alert
    electronically. It may not be edited in any way without the express
    written consent of iDEFENSE. If you wish to reprint the whole or any
    part of this alert in any other medium other than electronically, please
    email customerservice@idefense.com for permission.

    Disclaimer: The information in the advisory is believed to be accurate
    at the time of publishing based on currently available information. Use
    of the information constitutes acceptance for use in an AS IS condition.
    There are no warranties with regard to this information. Neither the
    author nor the publisher accepts any liability for any direct, indirect,
    or consequential loss or damage arising from use of, or reliance on,
    this information.


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