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TITLE:
Quagga "reachable/unreachable" NLRI Attributes Denial of Service

SECUNIA ADVISORY ID:
SA24808

VERIFY ADVISORY:
http://secunia.com/advisories/24808/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Quagga 0.x
http://secunia.com/product/4731/

DESCRIPTION:
Paul Jakma has reported a vulnerability in Quagga, which can be
exploited by malicious users to cause a DoS (Denial of Service).

The vulnerability is caused due to bgpd not checking the length
information of the "MP_UNREACH_NLRI" and  "MP_REACH_NLRI" attributes.
This can be exploited to cause an assertion error or out of bounds
read by sending a specially crafted UPDATE message.

Successful exploitation requires that the attacker is configured as
peer of the victim system.

The vulnerability is reported in all existing Quagga versions.

SOLUTION:
Connect to trusted peers only.

PROVIDED AND/OR DISCOVERED BY:
Paul Jakma

ORIGINAL ADVISORY:
http://www.quagga.net/news2.php?y=2007&m=4&d=8#id1176073740
http://bugzilla.quagga.net/show_bug.cgi?id=354

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