Bug 1354383 (CVE-2016-6187)

Summary:	CVE-2016-6187 kernel: apparmor: Potential privilege escalation via oops in apparmor_setprocattr()
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
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, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, pmatouse, rt-maint, rvrbovsk, slawomir, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability leading to a local privilege escalation was found in apparmor in the Linux kernel. When proc_pid_attr_write() was changed to use memdup_user apparmor's (interface violating) assumption that the setprocattr buffer was always a single page was violated.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-07-20 04:31:25 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:	1354385
Bug Blocks:	1354388

Description Andrej Nemec 2016-07-11 08:27:48 UTC

A vulnerability leading to a local privilege escalation was found in apparmor in the Linux kernel. When proc_pid_attr_write() was changed to use memdup_user apparmor's (interface violating) assumption that the setprocattr buffer was always a single page was violated.

Upstream pull request:

http://marc.info/?l=linux-kernel&m=146793642811929&w=2

Upstream fix:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=30a46a4647fd1df9cf52e43bf467f0d9265096ca

References:

http://seclists.org/oss-sec/2016/q3/30

Comment 1 Andrej Nemec 2016-07-11 08:29:13 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1354385]

Comment 2 Wade Mealing 2016-07-20 04:31:25 UTC

Statement:

Red Hat Enterprise Linux is not affected by this flaw as CONFIG_SECURITY_APPARMOR is not enabled in any current shipping kernels.