[VulnWatch] iDEFENSE Security Advisory 12.21.04: Multiple Vendor Xine version 0.99.2 PNM Handler PNA_TAG Heap Overflow Vulnerability

From: customer service mailbox (customerservice_at_idefense.com)
Date: 12/21/04

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    Date: Tue, 21 Dec 2004 17:37:47 -0500
    To: <vulnwatch@vulnwatch.org>
    
    

     
    Multiple Vendor Xine version 0.99.2 PNM Handler PNA_TAG Heap Overflow
    Vulnerability

    iDEFENSE Security Advisory 12.21.04
    www.idefense.com/application/poi/display?id=176&type=vulnerabilities
    December 21, 2004

    I. BACKGROUND

    Xine is a multimedia player which runs on multiple platforms.
    More information is available at:

       http://xinehq.de/

    II. DESCRIPTION

    Remote exploitation of a buffer overflow in version 0.99.2 of xine could

    allow execution of arbitrary code.

    The vulnerability specifically exists in the PNA_TAG handling code of
    the pnm_get_chunk() function. The function does not check the if the
    length of an input to be stored in a fixed size buffer is larger than
    the buffer size.

    III. ANALYSIS

    Exploitation of this vulnerability allows execution of arbitrary code
    with the privileges of the targeted user.

    In order to exploit this vulnerability, an attacker would have to
    convince the targeted user to open a connection to a malicious PNM
    server with xine, using a pnm://address/ URL. Depending on configuration

    options, this may be exploitable simply by clicking on a link, or it may

    require the user to launch the application, specifically requesting the
    malicious content.

    IV. DETECTION

    iDEFENSE Labs has confirmed the existence of this vulnerability in xine
    version 0.99.2. It is suspected that earlier versions of xine also
    contain this vulnerability.

    This vulnerability also affects MPlayer prior to MPlayer 1.0pre5try2.

    V. WORKAROUND
    iDEFENSE is currently unaware of any effective workarounds for this
    issue.

    VI. VENDOR RESPONSE

    xine-lib 1-rc8 was released to address this vulnerability and is
    available for download at:

       http://xinehq.de/index.php/releases
       
    An xine patch for this vulnerability is available at:

     
    http://cvs.sourceforge.net/viewcvs.py/xine/xine-lib/src/input/pnm.c?r1=1
    .20&r2=1.21

    An MPlayer patch for this vulnerability is available at:

       http://www.mplayerhq.hu/MPlayer/patches/pnm_fix_20041215.diff

    VII. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    names CAN-2004-1187 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

    12/10/2004 Initial vendor notification
    12/11/2004 Initial vendor response
    12/21/2004 Public disclosure

    IX. CREDIT

    The discoverer of this vulnerability wishes to remain anonymous.

    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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