Multiple Vendor GIMP Multiple Integer Overflow Vulnerabilities
iDefense Security Advisory 07.09.07
http://labs.idefense.com/intelligence/vulnerabilities/
Jul 09, 2007
I. BACKGROUND
The GNU Image Manipulation Program is commonly known as the GIMP. It is
a freely distributed piece of software for such tasks as photo
retouching, image composition and image authoring. It is available, in
many languages, for multiple operating systems. More information is
available at the following URL.
http://www.gimp.org/
II. DESCRIPTION
Remote exploitation of multiple integer overflow vulnerabilities in
several of the image loader plug-ins included with distributions of
'The GIMP' allow attackers to crash The GIMP or potentially execute
arbitrary code with the privileges of the user.
The following lines show the location of some vulnerabilities within the
code responsible for loading the DICOM, PNM, PSD, PSP, Sun RAS, XBM, and
XWD file formats. Each of the files are located within the
plug-ins/common directory of the source code.
dicom.c:391: value = g_new0 (guint8, element_length + 4);
pnm.c:566: data = g_new (guchar, gimp_tile_height () * info->xres * np);
pnm.c:628: data = g_new (guchar, gimp_tile_height () * info->xres *
info->np);
pnm.c:681: data = g_new (guchar, gimp_tile_height () * info->xres);
psd.c:2969: PSDheader.rowlength = g_malloc (PSDheader.rows *
psp.c:1225: pixel = g_malloc0 (height * width * bytespp);
sunras.c:955: data = g_malloc (tile_height * width);
sunras.c:1076: data = g_malloc (tile_height * width);
sunras.c:1146: data = g_malloc (tile_height * width * 3);
sunras.c:1231: data = g_malloc (tile_height * width * 3);
xbm.c:879: data = (guchar *) g_malloc (width * tileheight);
xwd.c:1193: data = g_malloc (tile_height * width);
xwd.c:1195: scanline = g_new (guchar, xwdhdr->l_bytes_per_line + 8);
xwd.c:1352: data = g_malloc (tile_height * width);
xwd.c:1441: data = g_malloc (tile_height * width * 3);
xwd.c:1601: data = g_malloc (tile_height * width * 3);
xwd.c:1812: data = g_malloc (tile_height * width * bytes_per_pixel);
In each case, an integer value from an untrusted input source has
arithmetic operations performed upon it to calculate the length to
allocate. Since no integer overflow checking is performed, a
potentially exploitable heap overflow may result.
This is not a complete list of integer overflow vulnerabilities in the
code.
III. ANALYSIS
Exploitation allows attackers to execute arbitrary code in the context
of the user opening a malicious image file.
In order to be successful, the attacker must convince the victim into
opening a maliciously crafted image with The GIMP.
IV. DETECTION
iDefense has confirmed that version 2.2.15 of The GIMP is vulnerable on
both Linux and Windows platforms. It is suspected that all previous
versions of the GIMP are also affected.
V. WORKAROUND
Consider moving the affected loader modules from The GIMP's plug-in
directory to another location. The location in the file system may vary
depending on distributions. On Red Hat Linux and Debian systems the
default plug-in directory is /usr/lib/gimp/2.0/plug-ins.
VI. VENDOR RESPONSE
The GIMP maintainers have released version 2.2.16 to address these
vulnerabilities. For more information, consult the following URL.
http://developer.gimp.org/NEWS-2.2
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2006-4519 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
VIII. DISCLOSURE TIMELINE
08/17/2006 Initial vendor notification
10/06/2006 Second vendor notification
06/26/2007 Third vendor notification
06/26/2007 Initial vendor response
07/09/2007 Coordinated public disclosure
IX. CREDIT
These vulnerabilities were discovered by Sean Larsson (iDefense Labs).
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
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http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
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part of this alert in any other medium other than electronically,
please e-mail 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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