bugtraq - RealPlayer 10.5 Denial of Service and possible Overflow

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Message-ID: <10c6adab050124082260bb657a@mail.gmail.com>
Date: Mon, 24 Jan 2005 14:22:25 -0200
From: Carlos Ulver <carlos.ulver@...il.com>
To: bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
Subject: RealPlayer 10.5 Denial of Service and possible
	Overflow

Well i was trying to find something in .ra format. I found something
interesting(I think)
I had an old .Ra and tryed to change some information of the file(via
an hexadecimal editor):
All my .ra files begin always with the following code:
.ra......ra4.........r.........>................+........
If i change ONE byte at the beginning RealAudio crashes like the
following example:
.ra......Aa4.........r.........>................+........

In this case I just overwrited the second 'r' for 'A' and RealPlayer crashed.
I could not see if i overwrite with more A´s be possible to write into
stack cause I´m with no good debugger here and I don´t understant
windows debug report.
It was tested only with RealPlayer 10.5. *** If possible some one try
to write into stack will be great. ***

I´m making files avaliable at           www.debarry2.com.br/carlos/rapoc.zip
as an proof of concept for this.

You could also get the rapoc.zip at www.debarry2.com.br/carlos by a
link I put at first page(top);

If its possible to write into stack all of u comrades know that we can
execute arbitrary code into affected systems.

Sorry for my bad Brazilian-english.

Carlos A. Ulver.

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