Bug 1129662 (CVE-2014-5206, CVE-2014-5207)

Summary:	CVE-2014-5206 CVE-2014-5207 kernel: mount flags handling during remount
Product:	[Other] Security Response	Reporter:	Vasyl Kaigorodov <vkaigoro>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, aquini, bhu, carnil, ccoleman, davej, dhoward, dmcphers, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jialiu, jkacur, jokerman, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kseifried, lgoncalv, lmeyer, lwang, madhu.chinakonda, matt, mchehab, mcressma, mmccomas, mmcgrath, 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:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-08-13 13:52:18 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:	1129669, 1129670, 1129672
Bug Blocks:	1129668

Description Vasyl Kaigorodov 2014-08-13 12:43:05 UTC

It was discovered that a privileged user in the user namespace with access to a bind mount can clear certain mount flags by calling "mount --bind -o remount,... ...".

Proposed patches:

https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git/commit/?h=for-linus&id=a6138db815df5ee542d848318e5dae681590fccd
https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git/commit/?h=for-linus&id=07b645589dcda8b7a5249e096fece2a67556f0f4
https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git/commit/?h=for-linus&id=9566d6742852c527bf5af38af5cbb878dad75705
https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git/commit/?h=for-linus&id=ffbc6f0ead47fa5a1dc9642b0331cb75c20a640e
https://git.kernel.org/cgit/linux/kernel/git/ebiederm/user-namespace.git/commit/?h=for-linus&id=db181ce011e3c033328608299cd6fac06ea50130

References:
http://seclists.org/oss-sec/2014/q3/357

Comment 1 Vasyl Kaigorodov 2014-08-13 12:47:46 UTC

Statement:

Not vulnerable.

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

Comment 3 Vasyl Kaigorodov 2014-08-13 12:49:00 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1129669]

Comment 4 Fedora Update System 2014-08-16 22:30:45 UTC

kernel-3.15.10-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2014-08-19 07:08:56 UTC

kernel-3.14.17-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.