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TITLE:
GameSpy CD-Key Validation Toolkit Key Denial of Service

SECUNIA ADVISORY ID:
SA15254

VERIFY ADVISORY:
http://secunia.com/advisories/15254/

CRITICAL:
Less critical

IMPACT:
Security Bypass, DoS

WHERE:
>From remote

SOFTWARE:
GameSpy SDK CD-Key Validation Toolkit
http://secunia.com/product/4374/

DESCRIPTION:
Luigi Auriemma has reported a vulnerability in GameSpy SDK CD-Key
Validation Toolkit, which can be exploited by malicious people to
prevent users from accessing game servers.

The vulnerability is caused due to a design error and can be
exploited by a malicious game server by either not informing a
GameSpy master server when a user leaves, or replay certain CD-key
validation packets to a GameSpy master server. Both attack vectors
will cause a particular CD-key to be marked as being in use.

Successful exploitation prevent players with valid CD-keys from
playing online, but requires that a user has connected to a malicious
game server.

A design error in the GameSpy CD-Key validation process has also been
reported. This can be exploited by malicious people to bypass the
CD-Key validation process and play with a CD-Key already in use.

SOLUTION:
Connect to trusted game servers only.

The second design error will reportedly be fixed on the master
servers.

PROVIDED AND/OR DISCOVERED BY:
Luigi Auriemma

ORIGINAL ADVISORY:
http://aluigi.altervista.org/adv/gskeyinuse-adv.txt
http://aluigi.altervista.org/adv/gskeydisc-adv.txt

OTHER REFERENCES:
List of games using the In-Game GameSpy.net Toolkits and/or GameSpy
Arcade:
http://www.gamespy.net/partners/

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