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TITLE:
Quake3 Engine "svc_download" Command Buffer Overflow

SECUNIA ADVISORY ID:
SA20401

VERIFY ADVISORY:
http://secunia.com/advisories/20401/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Quake3 Engine 3.x
http://secunia.com/product/4653/

DESCRIPTION:
Luigi Auriemma has reported a vulnerability in the Quake3 Engine,
which can be exploited by malicious people to cause a DoS (Denial of
Service) and potentially to compromise a user's system.

The vulnerability is caused due to a boundary error within the
"CL_ParseDownload()" function in "code/client/cl_parse.c" when
handling the download commands received from the server. This can be
exploited to cause a stack-based buffer overflow via a malicious
"svc_download" command sent from the server.

Successful exploitation may allow arbitrary code execution but
requires that e.g. the user is tricked into connecting to a malicious
server.

The vulnerability has been reported in Quake III 1.32c. Other
versions may also be affected.

Note: Other products based on the Quake3 engine may also be affected.

SOLUTION:
Do not connect to untrusted game servers.

PROVIDED AND/OR DISCOVERED BY:
Luigi Auriemma

ORIGINAL ADVISORY:
http://aluigi.altervista.org/adv/q3cbof-adv.txt

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