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RE: Detailed analysis: Buffer overflow in Explorer.exe on Windows XP SP1
From: "Executable Security" <exurity () rogers com>
Date: Wed, 14 May 2003 10:43:47 -0500

Hi:

-----Original Message-----
From: nesumin [mailto:nesumin () softhome net]

I could create the exploit code on my Japanese Windows XP SP1.
Perhaps, I think you can easily create the full exploit code
by the following;

* You can directly specify all overwritten data without thinking
  the UNICODE conversion if you create the "desktop.ini" as "UTF-16".
  (Adding BOM and encoding "[.ShellClassInfo]\x0d\x0a".)

* You can get the code area of about 0xFF4 bytes.
  (Before and after RET address)

Obviously, I was playing in the ANSI world. Yes, I agree with you that the
exploit code written in RTF-16 can be created with a size of about 0xFF4
bytes. A piece of 0xFF4 bytes long exploit code can do a lot. So, my
previous statement about limited exploitation of this buffer overflow is not
accurate.

It should be very easy to fix this bug. I manually modified the 800H to 400h
in shell32.dll to fix it.

Thanks a lot for your mention of BOM and UTF-16. Your concept is learnt and
programmatically reproduced with GetPrivateProfileSectionW.

Best regards

Peter Huang


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