[NT] Windows 2000 ShellExecute() API Lets Applications to Cause a Buffer Overflow
From: SecuriTeam (support_at_securiteam.com)
Date: 07/03/03
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To: list@securiteam.com Date: 3 Jul 2003 12:09:03 +0200
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Windows 2000 ShellExecute() API Lets Applications to Cause a Buffer
Overflow
------------------------------------------------------------------------
SUMMARY
A buffer overflow vulnerability exists in the Windows 2000 API function
ShellExecute(). The vulnerability would allow attackers to use web
browsers, MUAs, text editors, etc to cause the overflow to occur.
DETAILS
Vulnerable systems:
* SHELL32.DLL (Version 5.0.3502.6144)
Windows API ShellExecute() is a function to run an application associated
with a specified file extension.
The problem is triggered when the pointer to an unusually long string is
set to the 3rd argument of the Windows 2000 API ShellExecute() API
function.
It has been confirmed that several applications containing web browser,
MUA and text editor are vulnerable to this problem.
Solution:
This problem can be rectified by installing Windows 2000 Service Pack 4
that can be downloaded from:
<http://www.microsoft.com/windows2000/downloads/servicepacks/sp4/default.asp> http://www.microsoft.com/windows2000/downloads/servicepacks/sp4/default.asp
ADDITIONAL INFORMATION
The information has been provided by <mailto:y.arai@lac.co.jp> Yuu Arai
and Hisayuki Shinmachi ( <mailto:snsadv@lac.co.jp> Secure Net Service(SNS)
Security Advisory).
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