Bug 874835 (CVE-2012-4444)

Summary:	CVE-2012-4444 kernel: net: acceptation of overlapping ipv6 fragments
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, anton, bhu, davej, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jlieskov, jneedle, john.mora, jonathan, jrusnack, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, mcressma, plougher, ppandit, robert-bugzilla, rt-maint, rvrbovsk, sforsber, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-06-09 17:39:52 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	819952, 874550, 874837, 874838
Bug Blocks:	828852

Description Petr Matousek 2012-11-08 22:12:04 UTC

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 22:36:40 UTC

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 19:56:25 UTC

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