Bug 874835 - (CVE-2012-4444) CVE-2012-4444 kernel: net: acceptation of overlapping ipv6 fragments
CVE-2012-4444 kernel: net: acceptation of overlapping ipv6 fragments
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20091201,reported=2...
: Security
Depends On: 819952 874550 874837 874838
Blocks: 828852
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Reported: 2012-11-08 17:12 EST by Petr Matousek
Modified: 2015-07-31 06:29 EDT (History)
30 users (show)

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Doc Type: Bug Fix
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Last Closed: 2014-06-09 13:39:52 EDT
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Description Petr Matousek 2012-11-08 17:12:04 EST
Accepting overlapping fragmented ipv6 packets can lead to Operating Systems (OS) fingerprinting, IDS/IPS insertion/evasion, firewall evasion.
Do not accept such packets.

Linux kernel upstream fixes:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=70789d7052239992824628db8133de08dc78e593
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=f46421416fb6b91513fb687d6503142cd99034a5

References:
http://tools.ietf.org/rfc/rfc5722.txt
https://media.blackhat.com/bh-eu-12/Atlasis/bh-eu-12-Atlasis-Attacking_IPv6-WP.pdf

Acknowledgements:

Red Hat would like to thank Antonios Atlasis working with Beyond Security's SecuriTeam Secure Disclosure program and Loganaden Velvindron of AFRINIC for reporting this issue.
Comment 2 errata-xmlrpc 2012-12-18 17:36:40 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:1580 https://rhn.redhat.com/errata/RHSA-2012-1580.html
Comment 3 errata-xmlrpc 2013-01-22 14:56:25 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:0168 https://rhn.redhat.com/errata/RHSA-2013-0168.html

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