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Halo Off-By-One Bug Can Crash Multiplayer Server
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SUMMARY
" <http://www.bungie.net/Games/HaloPC/> Halo for PC is a conversion of
Bungie's Xbox classic - a first person sci-fi shooter set on a ring-shaped
alien artifact in deep space, as you in the role of Master Chief, attempt
to stop an alien race known as The Covenant from reaching Earth."
A bug in the way the server handles handshakes with a connecting client
allows the client to crash the server if a malformed packet is sent.
DETAILS
Vulnerable Systems:
* Halo: Combat Evolved, version 1.4 and prior (PC and Mac)
Immune Systems:
*Halo: Combat Evolved, patch version 1.5 (PC and Mac)
Halo uses the Gamespy SDK and specifically, the handshake algorithm
provided in this library to let players to join servers. A breakdown of
the algorithm is given by Luigi at
<http://aluigi.altervista.org/papers/gssdkcr.h>
http://aluigi.altervista.org/papers/gssdkcr.h.
In the last stage of the handshake taking place between the server and the
connecting client, the client is sending the last response. If this last
response is longer than 32 bytes, it will immediately cause the Halo
online server to crash.
A proof of concept code that demonstrates this can be downloaded from
<http://aluigi.altervista.org/poc/haloboom.zip>
http://aluigi.altervista.org/poc/haloboom.zip.
ADDITIONAL INFORMATION
The information has been provided by <mailto:aluigi@autistici.org> Luigi
Auriemma.
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