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TITLE:
XEmacs Image Processing Multiple Integer Overflows

SECUNIA ADVISORY ID:
SA35348

VERIFY ADVISORY:
http://secunia.com/advisories/35348/

DESCRIPTION:
Tielei Wang has discovered some vulnerabilities in XEmacs, which can
be exploited by malicious people to potentially compromise a user's
system.

1) An integer overflow error within the "tiff_instantiate()" function
in glyphs-eimage.c can be exploited to cause a heap-based buffer
overflow via a specially crafted TIFF file.

2) An integer overflow error within the "png_instantiate()" function
in glyphs-eimage.c can be exploited to cause a heap-based buffer
overflow via a specially crafted PNG file.

3) An integer overflow error within the "jpeg_instantiate()" function
in glyphs-eimage.c can be exploited to cause a heap-based buffer
overflow via a specially crafted JPEG file.

Successful exploitation of the vulnerabilities may allow execution of
arbitrary code.

The vulnerabilities are confirmed in version 21.4.22 on Windows.
Other versions may also be affected.

SOLUTION:
Do not process untrusted images with XEmacs.

PROVIDED AND/OR DISCOVERED BY:
Tielei Wang, ICST-ERCIS

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