From: Chenghuai Lu (luchenghuaiyahoo.com)
Date: Tue Oct 05 2004 - 09:54:52 CDT

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hi Marc and all,

I have a question here.

> The code in pnen3260.dll among other things is
> responsible for handling
> .rm files. The vulnerability is triggered by setting
> the length field of
> the VIDORV30 data chunk to 0xFFFFFFF8 - 0xFFFFFFFF
> this will cause an
> integer overflow which leads to a small block of
> memory being allocated,
> we call this movie from a SMIL file to handle the
> initial exception,
> eventually overflowing the buffer.

I check the Real Media file format at:
http://home.pcisys.net/~melanson/codecs/rmff.htm

According to what I understand, a data chunk has a
4-byte object_id as "DATA". This makes me a little
confused. What does a VIDORV30 data chunk mean? How do
I differentiate a general data chunk from a VIDORV30
data chunk?

Thank you in advance for any advice.

                
__________________________________
Do you Yahoo!?
Y! Messenger - Communicate in real time. Download now.
http://messenger.yahoo.com

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]