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TITLE:
FreeBSD IPv6 Neighbor Discovery Protocol Neighbor Solicitation
Vulnerability

SECUNIA ADVISORY ID:
SA32112

VERIFY ADVISORY:
http://secunia.com/advisories/32112/

CRITICAL:
Less critical

IMPACT:
Spoofing, Exposure of sensitive information, DoS

WHERE:
>From local network

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

DESCRIPTION:
A vulnerability has been reported in FreeBSD, which can be exploited
by malicious people to conduct spoofing attacks, disclose potentially
sensitive information, or to cause a DoS (Denial of Service).

The vulnerability is caused due to an error in the implementation of
the Neighbor Discovery protocol when processing neighbor solicitation
requests. This can be exploited to add a fake entry to the router's
neighbor cache via a neighbor solicitation request containing a
spoofed IPv6 address.

Successful exploitation may allow the interception or disruption of
network traffic, but requires that the IPv6 nodes involved in the
attack are using the same router.

SOLUTION:
Update FreeBSD or apply patches.

Fixed versions:
2008-10-01 00:32:59 UTC (RELENG_7, 7.1-PRERELEASE)
2008-10-01 00:32:59 UTC (RELENG_7_0, 7.0-RELEASE-p5)
2008-10-01 00:32:59 UTC (RELENG_6, 6.4-PRERELEASE)
2008-10-01 00:32:59 UTC (RELENG_6_3, 6.3-RELEASE-p5)

Patch for FreeBSD 6.3:
http://security.FreeBSD.org/patches/SA-08:10/nd6-6.patch
http://security.FreeBSD.org/patches/SA-08:10/nd6-6.patch.asc

Patch for FreeBSD 7.0:
http://security.FreeBSD.org/patches/SA-08:10/nd6-7.patch
http://security.FreeBSD.org/patches/SA-08:10/nd6-7.patch.asc

PROVIDED AND/OR DISCOVERED BY:
The vendor credits David Miles.

ORIGINAL ADVISORY:
http://security.freebsd.org/advisories/FreeBSD-SA-08:10.nd6.asc

OTHER REFERENCES:
US-CERT VU#472363:
http://www.kb.cert.org/vuls/id/472363

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