National Cyber Awareness System

Vulnerability Summary for CVE-2011-2395

Overview

The Neighbor Discovery (ND) protocol implementation in Cisco IOS on unspecified switches allows remote attackers to bypass the Router Advertisement Guarding functionality via a fragmented IPv6 packet in which the Router Advertisement (RA) message is contained in the second fragment, as demonstrated by (1) a packet in which the first fragment contains a long Destination Options extension header or (2) a packet in which the first fragment contains an ICMPv6 Echo Request message.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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External Source: XF

Name: ciscoios-nd-security-bypass(67940)

Hyperlink:http://xforce.iss.net/xforce/xfdb/67940

External Source: SREASON

Name: 8271

Hyperlink:http://securityreason.com/securityalert/8271

External Source: FULLDISC

Name: 20110523 Bypassing Cisco's ICMPv6 Router Advertisement Guard feature

Hyperlink:http://seclists.org/fulldisclosure/2011/May/446