TITLE:
OpenTTD Error Number Handling Denial of Service

SECUNIA ADVISORY ID:
SA19768

VERIFY ADVISORY:
http://secunia.com/advisories/19768/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
OpenTTD 0.x
http://secunia.com/product/5664/

DESCRIPTION:
Luigi Auriemma has reported a vulnerability in OpenTTD, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error within the handling of
error numbers received in PACKET_SERVER_ERROR and PACKET_CLIENT_ERROR
command packets. This can be exploited to cause the server to
terminate via an invalid error number sent by a malicious client.

Successful exploitation requires that the attacker has not been
banned from the server.

Note: It has also been reported that an error exists in the client
within the handling of the packet size field in a received UDP. This
can cause the client to return immediately to the main menu via
replies sent from a malicious server.

The vulnerability has been reported in version 0.4.7. Prior versions
may also be affected.

SOLUTION:
The vulnerability has reportedly been fixed in revision r4531 in the
CVS repositories.

PROVIDED AND/OR DISCOVERED BY:
Luigi Auriemma

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

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