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 Post subject: Stack overflow in gpbikes/wrs/kartracingpro
PostPosted: 15 Dec 2010 19:09 

Joined: 13 Aug 2007 21:44
Posts: 4068
Location: http://aluigi.org
maybe this deserves an advisory but for the moment I post it here.

if you don't know the games in the title the following are their homepages:
http://www.gp-bikes.com
http://www.worldracingseries.net
http://www.kartracing-pro.com

GP Bikes is really very good so take a look at it if you like racing games.

The games use all the same engine and they encrypt all the UDP packets
with blowfish (bf_ecb) using the key "fe7epraruWRa7reV".

This engine is vulnerable to an 8 bytes stack overflow because the
buffer is 1400 bytes long but the UDP packet received from the network
is 1408 bytes.
The overflow happens immediately after the decryption of the content.

Proof-of-concept:
nc SERVER PORT -u < piboso_1.dat

Note that Kart Racing Pro is compiled with the exception handler so there
is no code execution, only a crash.


Attachments:
File comment: proof-of-concept
piboso_1.zip [290 Bytes]
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