Bug 1170684 (CVE-2014-8989)

Summary:	CVE-2014-8989 kernel: Linux user namespaces can bypass group-based restrictions
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, ebiederm, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, plougher, pmatouse, ppandit, rt-maint, rvrbovsk, slawomir, 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:	2017-03-17 16:00:19 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:	1170688, 1170689
Bug Blocks:	1164976

Description Vincent Danen 2014-12-04 15:36:48 UTC

Linux kernel built with the User namespaces(CONFIG_USER_NS) support is vulnerable to a potential 'group' privilege escalation flaw. It could occur when unsharing parts of process' execution context from other processes via unshare(2) or clone(2) calls.

A user/process able to unshare parts of its execution context could use this flaw to gain extra 'group' privileges on a system.

References:
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  -> http://thread.gmane.org/gmane.linux.man/7385/
  -> http://www.openwall.com/lists/oss-security/2014/11/20/4

Comment 2 Vincent Danen 2014-12-04 15:39:26 UTC

Statement:

Not vulnerable. This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.

Comment 4 Petr Matousek 2014-12-04 15:44:15 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1170688]

Comment 8 Fedora Update System 2015-01-11 02:58:20 UTC

kernel-3.17.8-300.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2015-01-13 00:05:54 UTC

kernel-3.17.8-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.