TITLE:
Microsoft Windows "itss.dll" Heap Corruption Vulnerability

SECUNIA ADVISORY ID:
SA20061

VERIFY ADVISORY:
http://secunia.com/advisories/20061/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

OPERATING SYSTEM:
Microsoft Windows 2000 Advanced Server
http://secunia.com/product/21/
Microsoft Windows 2000 Datacenter Server
http://secunia.com/product/1177/
Microsoft Windows 2000 Professional
http://secunia.com/product/1/
Microsoft Windows 2000 Server
http://secunia.com/product/20/
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/

DESCRIPTION:
Rubén Santamarta has discovered a vulnerability in Microsoft Windows,
which potentially can be exploited by malicious people to compromise a
user's system.

The vulnerability is caused due to a boundary error in the Infotech
Storage System Library (itss.dll) when reading a ".CHM" file. This
can be exploited to cause heap corruption and may allow arbitrary
code execution via a specially crafted ".CHM" file.

Successful exploitation requires that the user is e.g. tricked in
opening or decompiling a malicious ".CHM" file using "hh.exe".

The vulnerability has been confirmed in Windows XP SP2 (fully
patched) and also reported in Windows 2000 SP4. Other versions may
also be affected.

NOTE: The CHM file format should be considered insecure and treated
similar to an executable file. However, this vulnerability is
triggered even when the user decompiles the file without opening it.

SOLUTION:
The vulnerability will reportedly be fixed in the next Service Pack.

Do not open or decompile untrusted ".CHM" files.

PROVIDED AND/OR DISCOVERED BY:
Rubén Santamarta

ORIGINAL ADVISORY:
http://reversemode.com/index.php?option=com_content&task=view&id=11&Itemid=1

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