Bug 1094602 (CVE-2014-0206)

Summary:	CVE-2014-0206 kernel: aio: insufficient sanitization of head in aio_read_events_ring()
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
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, carnil, dhoward, esammons, fhrbata, iboverma, jkacur, jkurik, jmoyer, jross, kernel-mgr, lgoncalv, lwang, matt, mcressma, mguzik, nobody, npajkovs, pholasek, plougher, security-response-team, 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:	2014-07-22 20:01:46 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:	1094604, 1094605, 1094606, 1112975
Bug Blocks:	1094607

Description Petr Matousek 2014-05-06 06:39:19 UTC

It was found that aio_read_events_ring() function in the Linux kernel's
AIO subsystem did not properly sanitize AIO ring head coming from
userspace.

An unprivileged local user could use this flaw to randomly disclose parts
of (physical) memory belonging to kernel and/or other processes.

Introduced by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a31ad380bed817aa25f8830ad23e1a0480fef797

Upstream commits:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=edfbbf388f29
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f8567a3845ac

Acknowledgements:

This issue was discovered by Mateusz Guzik of Red Hat.

Comment 5 Petr Matousek 2014-06-24 11:17:40 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.

Comment 8 errata-xmlrpc 2014-06-24 15:59:36 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:0786 https://rhn.redhat.com/errata/RHSA-2014-0786.html

Comment 9 Petr Matousek 2014-06-25 07:33:33 UTC

Proposed upstream patches:

  https://lkml.org/lkml/2014/6/24/619
  https://lkml.org/lkml/2014/6/24/623

Comment 10 Petr Matousek 2014-06-25 07:34:37 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1112975]

Comment 11 John Kacur 2014-06-27 12:52:40 UTC

The comments on the patches claim to need a separate backport for v3.10 / v3.11, although they look like they would apply cleanly. Is this true? If so, when can we expect them?

Comment 12 Jeff Moyer 2014-06-27 13:06:26 UTC

(In reply to John Kacur from comment #11)
> The comments on the patches claim to need a separate backport for v3.10 /
> v3.11, although they look like they would apply cleanly. Is this true? If
> so, when can we expect them?

They've already been posted upstream.

http://www.spinics.net/lists/stable/msg51486.html
http://www.spinics.net/lists/stable/msg51487.html

Comment 13 Fedora Update System 2014-06-30 10:29:07 UTC

kernel-3.14.9-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 14 errata-xmlrpc 2014-07-22 18:01:04 UTC

This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:0913 https://rhn.redhat.com/errata/RHSA-2014-0913.html

Comment 15 Fedora Update System 2014-07-25 10:08:38 UTC

kernel-3.14.13-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.