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Multiple Vendor xzgv PRF Parsing Integer Overflow Vulnerability
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SUMMARY
xzgv is "a picture viewer for X, with a thumbnail-based file selector. It
uses GTK+ and Imlib 1.x. Most file formats are supported, and the
thumbnails used are compatible with xv, zgv and the Gimp".
Remote exploitation of an integer overflow vulnerability in various
vendors' implementations of the read_prf_file method in the xzgv program
could allow for arbitrary code execution. The vulnerability specifically
exists due to an integer overflow while allocating memory for an image
file.
DETAILS
The vulnerable code is as follows:
xzgv-0.8/src/readprf.c:
if((*theimageptr=malloc(width*height*3))==NULL)
[...]
The values width and height are integers that are ultimately supplied by
the image file. With certain values for height and width set in an image
file, not enough memory is allocated due to an integer overflow. The under
allocated memory is later written to, causing heap corruption and possible
arbitrary code execution with the privileges of the user viewing the image
file.
Analysis:
Exploitation allows attackers to gain the privileges of the user viewing
the image file. If a user can be convinced to view a malicious file, this
vulnerability can be exploited remotely.
Detection:
The following vendors have confirmed the availability of susceptible xzgv
packages within their respective operating system distributions:
SuSE
Debian
Gentoo
FreeBSD
Workaround:
Only accept image files from trusted sources. Use a different image viewer
program to view untrusted images.
Vendor Response:
The vulnerability has been addressed in the following patch:
<http://rus.members.beeb.net/xzgv-0.8-integer-overflow-fix.diff>
http://rus.members.beeb.net/xzgv-0.8-integer-overflow-fix.diff
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0994>
CAN-2004-0994.
Disclosure Timeline:
11/05/2004 - Initial vendor notification
12/10/2004 - Secondary vendor notification
12/10/2004 - Initial vendor response
12/13/2004 - Coordinated public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:idlabs-advisories@idefense.com> iDEFENSE.
The original article can be found at:
<http://www.idefense.com/application/poi/display?id=160&type=vulnerabilities&flashstatus=false>
http://www.idefense.com/application/poi/display?id=160&type=vulnerabilities&flashstatus=false
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