Bug 723429 (CVE-2011-2699)

Summary:	CVE-2011-2699 kernel: ipv6: make fragment identifications less predictable
Product:	[Other] Security Response	Reporter:	Eugene Teo (Security Response) <eteo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	anton, arozansk, bhu, cww, davej, dhoward, fhrbata, jkacur, jpirko, kernel-mgr, kmcmartin, lgoncalv, lwang, mjc, plougher, pmatouse, pneedle, rt-maint, sforsber, tcallawa, vgoyal, 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:	2012-05-10 08:13:31 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:	723430, 723431, 723432, 723433, 723434, 748667, 761356, 773543
Bug Blocks:	717530

Description Eugene Teo (Security Response) 2011-07-20 06:54:53 UTC

IPv6 fragment identification generation is way beyond what we use for IPv4 : It uses a single generator. Its not scalable and allows DOS attacks.

Now inetpeer is IPv6 aware, we can use it to provide a more secure and scalable frag ident generator (per destination, instead of system wide)

This patch :
1) defines a new secure_ipv6_id() helper
2) extends inet_getid() to provide 32bit results
3) extends ipv6_select_ident() with a new dest parameter

http://thread.gmane.org/gmane.linux.network/201773

Acknowledgements:

Red Hat would like to thank Fernando Gont for reporting this issue.

Comment 7 Petr Matousek 2011-07-20 10:06:47 UTC

Statement:

This issue did not affect the Linux kernel as shipped with Red Hat Enterprise MRG as it has backported the fix that addresses this issue. Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle, https://access.redhat.com/support/policy/updates/errata/, therefore the fix for this issue is not currently planned to be included in the future updates. This has been addressed in Red Hat Enterprise Linux 5 and 6 via https://rhn.redhat.com/errata/RHSA-2011-1386.html and https://rhn.redhat.com/errata/RHSA-2011-1465.html.

Comment 9 Eugene Teo (Security Response) 2011-07-26 09:00:50 UTC

Upstream commit:
http://git.kernel.org/linus/87c48fa3b4630905f98268dde838ee43626a060c

Comment 11 Eugene Teo (Security Response) 2011-08-24 05:11:11 UTC

(In reply to comment #9)
> Upstream commit:
> http://git.kernel.org/linus/87c48fa3b4630905f98268dde838ee43626a060c

I believe this is the one we want to backport; http://permalink.gmane.org/gmane.linux.kernel.stable/16086

Comment 13 Jiri Pirko 2011-08-27 07:51:26 UTC

http://git.kernel.org/?p=linux/kernel/git/stable/linux-3.0.y.git;a=commitdiff;h=ef81bb40bf15f350fe865f31fa42f1082772a576

Comment 16 errata-xmlrpc 2011-10-20 17:28:27 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2011:1386 https://rhn.redhat.com/errata/RHSA-2011-1386.html

Comment 17 Eugene Teo (Security Response) 2011-10-25 03:33:26 UTC

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 748667]

Comment 19 errata-xmlrpc 2011-11-22 16:49:44 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:1465 https://rhn.redhat.com/errata/RHSA-2011-1465.html

Comment 22 errata-xmlrpc 2012-03-06 17:43:31 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5.6 EUS - Server Only

Via RHSA-2012:0358 https://rhn.redhat.com/errata/RHSA-2012-0358.html