[VulnWatch] iDEFENSE Security Advisory 01.17.05: Multiple Vendor ImageMagick .psd Image File Decode Heap Overflow Vulnerability

From: customer service mailbox (customerservice_at_idefense.com)
Date: 01/17/05

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    Date: Mon, 17 Jan 2005 13:27:23 -0500
    To: <bugtraq@securityfocus.com>, <vulnwatch@vulnwatch.org>
    
    

    Multiple Vendor ImageMagick .psd Image File Decode Heap Overflow
    Vulnerability

    iDEFENSE Security Advisory 01.17.05
    www.idefense.com/application/poi/display?id=184&type=vulnerabilities
    January 17, 2005

    I. BACKGROUND

    ImageMagick provides a variety of graphics image-handling libraries and
    capabilities. These libraries are widely used and are shipped by default

    on most Unix and Linux distributions. These libraries are commonly
    installed by default on computers where any other graphical image viewer
    or X Desktop environment is installed (such as Gnome or KDE).

    More information is available at the following site:

       http://www.imagemagick.org

    II. DESCRIPTION

    Remote exploitation of a buffer overflow vulnerability in The
    ImageMagick's Project's ImageMagick PSD image-decoding module could
    allow an attacker to execute arbitrary code.

    A heap overflow exists within ImageMagick, specifically in the decoding
    of Photoshop Document (PSD) files. The vulnerable code follows:

    ImageMagick-6.1.0/coders/psd.c

    for (j=0; j < (long) layer_info[i].channels; j++)
    {
      layer_info[i].channel_info[j].type=(short)ReadBlobMSBShort(image);
      layer_info[i].channel_info[j].size=ReadBlobMSBLong(image);
      [...]
    }

    The array channel_info is only 24 elements large, and the loop variable,

    "j", is bounded by a user-supplied value from the image file, thus
    allowing a heap overflow to occur when more than 24 layers are
    specified. If heap structures are overflowed in a controlled way,
    execution of arbitrary code is possible.

    III. ANALYSIS

    Exploitation may allow attackers to run arbitrary code on a victim's
    computer if the victim opens a specially formatted image. Such images
    could be delivered by e-mail or HTML, in some cases, and would likely
    not raise suspicion on the victim's part. Exploitation is also possible
    when a web-based application uses ImageMagick to process user-uploaded
    image files.

    IV. DETECTION

    iDEFENSE has confirmed this vulnerability in ImageMagick 6.1.0 and
    ImageMagick 6.1.7. Earlier versions are also suspected vulnerable.

    The following vendors may include vulnerable ImageMagick packages:
            
       The Debian Project
       MandrakeSoft
       Red Hat, Inc.

    V. WORKAROUND

    Do not open files from untrusted sources. Do not allow untrusted sources

    to process images using your web application.

    VI. VENDOR RESPONSE

    This vulnerability is addressed in ImageMagick 6.1.8-8, available for
    download at:

       http://www.imagemagick.org/www/download.html

    VII. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    names CAN-2005-0005 to these issues. This is a candidate for inclusion
    in the CVE list (http://cve.mitre.org), which standardizes names for
    security problems.

    A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
    been assigned yet.

    VIII. DISCLOSURE TIMELINE

    12/21/2004 Initial vendor notification
    01/14/2004 Initial vendor response
    01/17/2005 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 (c) 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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