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Cisco Security

IPv6 multi-crafted fragments

 
Signature ID: 1607/0
Original Release:S182
Release:S642 (download)
Original Release Date:2005 July 25
Latest Release Date:2012 April 19
Default Enabled:False
Default Retired:True
Alarm Severity:Medium
Fidelity:90 

Description

This alert will trigger when more than one IPv6 "first fragment"is seen on an address/fragment set.The address set includes IPv6 addresses (Src and Dst), and the4 byte Fragment Identification.A "first fragment" is when the OFFSET is 0 and the MoreFragsbit is 1.Multiple "first fragments" are indicative of a malformedpacket stream. The normal protocol operation specifies thatthere can be only one "first fragment" in a fragmented datagram.Contents of a typical include: 1) Src and Dst addresses are the lower 4 octets of the IPv6 address. 1) Src and Dst IPv6 address (16 octets each). 2) optional Length - the length of the malformed option. 3) optional Count - the number of occurrences of a condition.

Recommended Filter

There are no suggested filters.

Benign Triggers

There are no known benign triggers.

IntelliShield Alerts

IntelliShield ID Headline VersionCVSS ScoreLast Published
9534Cisco IOS Malformed IPv6 Packet Vulnerability42005 August 04 15:17 GMT

Download

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