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TITLE:
Yager Buffer Overflow and Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA14967

VERIFY ADVISORY:
http://secunia.com/advisories/14967/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Yager 5.x
http://secunia.com/product/4920/

DESCRIPTION:
Luigi Auriemma has reported some vulnerabilities in Yager, which can
be exploited by malicious people to cause a DoS (Denial of Service)
and compromise a vulnerable system.

1) A boundary error in the handling of the nickname field can be
exploited to cause a buffer overflow by sending some specially
crafted data to a vulnerable server.

Successful exploitation can lead to execution of arbitrary code.

2) A boundary error in the communication handling can be exploited to
cause a buffer overflow by sending an overly long data block to a
vulnerable server (more than 256 bytes).

3) An error in the communication handling can be exploited to freeze
a vulnerable server by sending an incomplete data block.

4) An error in the communication handling can be exploited to crash a
vulnerable server via some malformed data.

The vulnerabilities have been reported in version 5.24 and prior.
Other versions may also be affected.

SOLUTION:
Host games on a trusted network only.

PROVIDED AND/OR DISCOVERED BY:
Luigi Auriemma

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

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