TITLE:
ENet Library Two Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA19208

VERIFY ADVISORY:
http://secunia.com/advisories/19208/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
ENet Library
http://secunia.com/product/8679/

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

1) A signedness error exists in the
"enet_protocol_handle_incoming_commands()" function when validating a
pointer to ensure that it does not access memory beyond the received
packet. This can be exploited to bypass the check and cause
out-of-bounds memory access via an overly large value in the
"commandLength" field of the packet.

2) An error within the handling of fragmented packet reassembly can
be exploited to cause the library to terminate the application when
it fails to allocate memory to rebuilt all the fragments. This can be
exploited via an overly large total data size value sent by the
attacker.

The vulnerabilities have been reported in versions released July 2005
and prior. Other versions may also be affected.

Note: All applications that use the library may be affected.

SOLUTION:
Filter potentially malicious UDP packets using a firewall.

PROVIDED AND/OR DISCOVERED BY:
Luigi Auriemma

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

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