Bug 874835 (CVE-2012-4444) - CVE-2012-4444 kernel: net: acceptation of overlapping ipv6 fragments
Summary: CVE-2012-4444 kernel: net: acceptation of overlapping ipv6 fragments
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2012-4444
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 819952 874550 874837 874838
Blocks: 828852
TreeView+ depends on / blocked
 
Reported: 2012-11-08 22:12 UTC by Petr Matousek
Modified: 2023-05-11 20:39 UTC (History)
30 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-06-09 17:39:52 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2012:1580 0 normal SHIPPED_LIVE Moderate: kernel security, bug fix and enhancement update 2012-12-19 03:31:48 UTC
Red Hat Product Errata RHSA-2013:0168 0 normal SHIPPED_LIVE Moderate: kernel security and bug fix update 2013-01-23 00:55:33 UTC

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
Note You need to log in before you can comment on or make changes to this bug.