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Vigil@nce: BSD, Juniper: changes in an IPv6 router

October 2008 by Vigil@nce

An attacker on the LAN can send a Neighbor Solicitation packet in
order to change information on the router related to a computer on
another LAN.

 Gravity: 2/4
 Consequences: data reading, denial of service of computer
 Provenance: LAN
 Means of attack: 1 attack
 Ability of attacker: technician (2/4)
 Confidence: confirmed by the editor (5/5)
 Diffusion of the vulnerable configuration: high (3/3)
 Creation date: 02/10/2008
 Revision date: 02/10/2008

IMPACTED PRODUCTS

 FreeBSD
 Juniper JUNOS
 Juniper JUNOSe
 NetBSD
 OpenBSD

DESCRIPTION

A router has two or several LAN connected to different physical
interfaces.

The IPv6 Neighbor Discovery protocol uses 5 types of packets (RFC
4861):
 Neighbor Solicitation : query the link layer (Ethernet) address
of a neighbor form its IP address
 Neighbor Advertisement : answer
 etc.

When the router receives a Neighbor Solicitation packet, it keeps
in cache information about the sender (under FreeBSD, by calling
the nd6_cache_lladdr() function of netinet6/nd6.c at the end of
the function nd6_ns_input()). However, an attacker can spoof the
IP address of a computer on another LAN, in order to force the
memorization of this address associated to the bad physical
interface.

An attacker can therefore create a denial of service, an
eventually obtain packets for the spoofed IP address.

CHARACTERISTICS

 Identifiers: BID-31529, CVE-2008-2476, CVE-2008-4404,
FreeBSD-SA-08:10.nd6, VIGILANCE-VUL-8140, VU#472363
 Url: http://vigilance.aql.fr/vulnerability/8140


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