TITLE:
Zdaemon Denial of Service and Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA19496

VERIFY ADVISORY:
http://secunia.com/advisories/19496/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
ZDaemon 1.x
http://secunia.com/product/9108/

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

1) A boundary error in the checking of client maps (.wad files) when
a client connects can be exploited to cause a buffer overflow by
passing an overly long string (more than 256 bytes) as the filename
of a map.

Successful exploitation requires knowledge of the password if the
server is password protected.

2) Out-of-bounds memory access errors in the "ZD_MissingPlayer()",
"ZD_UseItem()", and "ZD_ValidClient()" functions can be exploited to
crash the server by supplying an invalid value.

Successful exploitation requires access to a match on a vulnerable
server.

The vulnerabilities have been reported in version 1.08.01. Other
versions may also be affected.

SOLUTION:
Grant only trusted clients access to matches by password protecting
vulnerable game servers.

PROVIDED AND/OR DISCOVERED BY:
Luigi Auriemma

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

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