[SA19017] FreeBSD "nfsd" NFS Mount Request Denial of Service

TITLE:
FreeBSD "nfsd" NFS Mount Request Denial of Service

SECUNIA ADVISORY ID:
SA19017

VERIFY ADVISORY:
http://secunia.com/advisories/19017/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
FreeBSD 6.x
http://secunia.com/product/6778/

DESCRIPTION:
Evgeny Legerov has reported a vulnerability in FreeBSD, 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
NFS mount requests. This can be exploited to cause kernel panic via a
specially-crafted request sent to the "nfsd" daemon on port 2049/tcp.

The vulnerability has been reported in the FreeBSD 6.0 kernel. Other
versions may also be affected.

SOLUTION:
Restrict access to the affected service using a firewall.

PROVIDED AND/OR DISCOVERED BY:
Evgeny Legerov

ORIGINAL ADVISORY:
http://lists.immunitysec.com/pipermail/dailydave/2006-February/002982.html

About:
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everybody keeping their systems up to date against the latest
vulnerabilities.

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