Bug 1182059 (CVE-2014-8160)

Summary:	CVE-2014-8160 kernel: iptables restriction bypass if a protocol handler kernel module not loaded
Product:	[Other] Security Response	Reporter:	Vasyl Kaigorodov <vkaigoro>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, ccoleman, dhoward, dmcphers, dominik.mierzejewski, fhrbata, gansalmon, iboverma, itamar, jforbes, jialiu, jkacur, joelsmith, jokerman, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lmeyer, madhu.chinakonda, matt, mchehab, mcressma, mmccomas, mmcgrath, nmurray, plougher, pmatouse, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way the Linux kernel's netfilter subsystem handled generic protocol tracking. As demonstrated in the Stream Control Transmission Protocol (SCTP) case, a remote attacker could use this flaw to bypass intended iptables rule restrictions when the associated connection tracking module was not loaded on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:37:57 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:	1114697, 1170520, 1182063, 1182064, 1182071, 1182072
Bug Blocks:	1115023

Description Vasyl Kaigorodov 2015-01-14 11:16:57 UTC

It was reported [1] that iptables can allow protocols that do not have a protocol handler kernel module loaded.

Given following iptables ruleset:
-P FORWARD DROP
-A FORWARD -m sctp --dport 9 -j ACCEPT
-A FORWARD -p tcp --dport 80 -j ACCEPT
-A FORWARD -p tcp -m conntrack -m state ESTABLISHED,RELATED -j ACCEPT

One would assume that this allows SCTP on port 9 and TCP on port 80.
Unfortunately, if the SCTP conntrack module is not loaded, this allows *all* SCTP communication to pass through, i.e. -p sctp -j ACCEPT

[1]: http://www.spinics.net/lists/netfilter-devel/msg33430.html

Comment 2 Vasyl Kaigorodov 2015-01-14 11:22:00 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1182063]

Comment 4 Petr Matousek 2015-01-14 11:39:46 UTC

Upstream patch:

git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=db29a9508a9246e77087c5531e45b2c88ec6988b

Comment 5 errata-xmlrpc 2015-03-03 12:52:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.5 EUS - Server and Compute Node Only

Via RHSA-2015:0284 https://rhn.redhat.com/errata/RHSA-2015-0284.html

Comment 7 errata-xmlrpc 2015-03-05 13:04:27 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0290 https://rhn.redhat.com/errata/RHSA-2015-0290.html

Comment 8 errata-xmlrpc 2015-03-11 15:29:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:0674 https://rhn.redhat.com/errata/RHSA-2015-0674.html

Comment 9 Dominik Mierzejewski 2016-04-18 15:50:14 UTC

What's the status of this bug WRT RHEL5?