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Category:   Application (Generic)  >   libXpm Vendors:   X.org
(OpenBSD Issues Fix) libXpm Integer and Stack Overflows May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1011335
SecurityTracker URL:  http://securitytracker.com/id/1011335
CVE Reference:   CVE-2004-0687, CVE-2004-0688   (Links to External Site)
Date:  Sep 17 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): X11 R6.8.0
Description:   Some vulnerabilities were reported in libXpm. A remote user may be able to execute arbitrary code on applications that use libXpm.

The vendor reported that there are some integer overflows [CVE: CVE-2004-0687] and stack overflows [CVE: CVE-2004-0688] in the libXpm X Pixmap library, shipped as part of the X Window System.

A stack overflow is reported in xpmParseColors() in 'parse.c' that can be triggered by a specially crafted XPMv1 and XPMv2/3 file. A demonstration exploit file is available at:

http://scary.beasts.org/misc/doom.xpm

A stack overflow is reported in the reading of pixel values in the ParseAndPutPixels() function in 'create.c' and in the ParsePixels() function in 'parse.c'. A demonstration exploit file is available at:

http://scary.beasts.org/misc/doom2.xpm

An integer overflow is reported in the colorTable allocation in xpmParseColors() in 'parse.c'. The XpmCreateImageFromXpmImage, CreateXImage, ParsePixels, ParseAndPutPixels, and ParsePixels are affected.

The vendor credits Chris Evans with reporting these flaws. The advisory from Chris Evans is available at:

http://scary.beasts.org/security/CESA-2004-003.txt

Impact:   A remote user can create a specially crafted image file that, when processed by an application using libXpm, will execute arbitrary code on the target system with the privileges of the target application.
Solution:   OpenBSD has issued patches for OpenBSD 3.4 and 3.5, available at:

ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.4/common/030_xpm.patch
ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.5/common/019_xpm.patch

Vendor URL:  www.x.org/pub/X11R6.8.0/patches/README.xorg-CVE-2004-0687-0688.patch (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (OpenBSD)
Underlying OS Comments:  3.4, 3.5

Message History:   This archive entry is a follow-up to the message listed below.
Sep 16 2004 libXpm Integer and Stack Overflows May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  Xpm library security fix


Chris Evans reported several flaws (stack and integer overflows) in the
Xpm library code that parses image files (CAN-2004-0687, CAN-2004-0688).
Some of these would be exploitable when parsing malicious image files in
an application that handles XPM images, if they could escape ProPolice.

The fixes have been committed to OpenBSD -current as well as the
3.4 and 3.5 -stable branches.

Patches against OpenBSD 3.4 and 3.5 are also available:
    ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.4/common/030_xpm.patch
    ftp://ftp.OpenBSD.org/pub/OpenBSD/patches/3.5/common/019_xpm.patch

 
 


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