442410 – Kernel : net: acceptation of overlapping ipv6 fragments (CVE-2012-4444)

Bug 442410 - Kernel : net: acceptation of overlapping ipv6 fragments (CVE-2012-4444)

Summary: Kernel : net: acceptation of overlapping ipv6 fragments (CVE-2012-4444)

Status:	RESOLVED FIXED

Alias:	None

Product:	Gentoo Security
Classification:	Unclassified
Component:	Kernel (show other bugs)
Hardware:	All Linux

Importance:	Normal normal (vote)
Assignee:	Gentoo Security

URL:
Whiteboard:	[<2.6.36]
Keywords:

Depends on:
Blocks:

Reported:	2012-11-09 09:56 UTC by Agostino Sarubbo
Modified:	2013-09-04 02:27 UTC (History)
CC List:	1 user (show)

See Also:
Package list:
Runtime testing required:	---

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Description Agostino Sarubbo gentoo-dev

2012-11-09 09:56:23 UTC

From https://bugzilla.redhat.com/show_bug.cgi?id=874835 :

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

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