Bug 1190966 (CVE-2015-1573)

Summary:	CVE-2015-1573 kernel: panic while flushing nftables rules that reference deleted chains.
Product:	[Other] Security Response	Reporter:	Wade Mealing <wmealing>
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, aquini, bhu, dhoward, esammons, fhrbata, fweimer, iboverma, jkacur, jross, kernel-mgr, lgoncalv, lwang, matt, mcressma, mguzik, nmurray, pholasek, 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 nft_flush_table() function of the Linux kernel's netfilter tables implementation flushed rules that were referencing deleted chains. A local user who has the CAP_NET_ADMIN capability could use this flaw to crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-06-23 12:18:00 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:	1192880, 1192881, 1192884, 1192885, 1223893
Bug Blocks:	1187578

Description Wade Mealing 2015-02-10 06:30:09 UTC

A flaw was found in the nft_flush_table function in the Linux kernel netfilter tables implementation.  The kernel would panic if it was commanded to flush rules referencing chains that had already been deleted. 

A local attacker with the CAP_NET_ADMIN capability could use this to panic (denial of service) a system if they were able to flush an effected chain.

Docker images with "root" permissions are not granted this capability by default.  Systems with privileged containers (started with docker run -privileged .. ) will be able to expose the system to this condition allowing the defect to be exploited.

Upstream commit fixing the problem:
http://git.kernel.org/cgit/linux/kernel/git/pablo/nf.git/commit/?id=a2f18db0c68fec96631c10cad9384c196e9008ac

CVE request:
http://seclists.org/oss-sec/2015/q1/501

Comment 4 Wade Mealing 2015-04-22 00:09:30 UTC

Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6 (as they did not include support for netfilter tables API).

This issue affects the versions of the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG 2. Future kernel updates for the respective releases may address this issue.

Comment 7 errata-xmlrpc 2015-06-23 08:25:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1139 https://rhn.redhat.com/errata/RHSA-2015-1139.html

Comment 8 errata-xmlrpc 2015-06-23 08:28:56 UTC

This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2015:1138 https://rhn.redhat.com/errata/RHSA-2015-1138.html

Comment 9 errata-xmlrpc 2015-06-23 08:47:55 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1137 https://rhn.redhat.com/errata/RHSA-2015-1137.html