安全通告：FreeBSD-SA-08:10.nd6

Topic: IPv6 Neighbor Discovery Protocol routing vulnerability
Category: core
Module: sys_netinet6
Announced: 2008-10-01
Credits: David Miles
Affects: All supported versions of
[url=javascript:;]FreeBSD[/url]
.
Corrected: 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)
CVE Name: CVE-2008-2476
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit .
I. Background
IPv6 nodes use the Neighbor Discovery protocol to determine the link-layer
address of other nodes, find routers, and maintain reachability information.
The Neighbor Discovery protocol uses Neighbor Solicitation (ICMPv6 type 135)
to query target nodes for their link-layer addresses.
II. Problem Description
IPv6 routers may allow "on-link" IPv6 nodes to create and update the
router's neighbor cache and forwarding information. A malicious IPv6 node
sharing a common router but on a different physical segment from another
node may be able to spoof Neighbor Discovery messages, allowing it to update
router information for the victim node.
III. Impact
An attacker on a different physical network connected to the same IPv6
router as another node could redirect IPv6 traffic intended for that node.
This could lead to denial of service or improper access to private network
traffic.
IV. Workaround
Firewall packet filters can be used to filter incoming Neighbor
Solicitation messages but may interfere with normal IPv6 operation if not
configured carefully.
Reverse path forwarding checks could be used to make gateways, such as
routers or firewalls, drop Neighbor Solicitation messages from
nodes with unexpected source addresses on a particular interface.
IPv6 router administrators are encouraged to read RFC 3756 for further
discussion of Neighbor Discovery security implications.
V. Solution
NOTE WELL: The solution described below causes IPv6 Neighbor Discovery
Neighbor Solicitation messages from non-neighbors to be ignored.
This can be re-enabled if required by setting the newly added
net.inet6.icmp6.nd6_onlink_ns_rfc4861
[url=javascript:;]sysctl[/url]
to a non-zero value.
Perform one of the following:
1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the
RELENG_7_0, or RELENG_6_3 security branch dated after the correction
date.
2) To
[url=javascript:;]patch[/url]
your present system:
The following patches have been verified to apply to FreeBSD 6.3 and

标签：

版权申明：本站文章部分自网络，如有侵权，请联系：west999com@outlook.com
特别注意：本站所有转载文章言论不代表本站观点，本站所提供的摄影照片，插画，设计作品，如需使用，请与原作者联系，版权归原作者所有