Bug 782681

Summary:	CVE-2012-0056 kernel: proc: /proc/<pid>/mem mem_write insufficient permission checking [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Eugene Teo (Security Response) <eteo>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	15	CC:	cse.cem+redhatbugz, davej, gansalmon, itamar, jonathan, jwboyer, kernel-maint, madhu.chinakonda, pmatouse
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-2.6.41.10-3.fc15	Doc Type:	Release Note
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-01-24 07:56:29 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:
Bug Blocks:	782642

Description Eugene Teo (Security Response) 2012-01-18 07:09:22 UTC

This is an automatically created tracking bug!  It was created to ensure
that one or more security vulnerabilities are fixed in affected Fedora
versions.

For comments that are specific to the vulnerability please use bugs filed
against "Security Response" product referenced in the "Blocks" field.

For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs

When creating a Bodhi update request, please include this bug ID and the
bug IDs of this bug's parent bugs filed against the "Security Response"
product (the top-level CVE bugs).  Please mention the CVE IDs being fixed
in the RPM changelog when available.

Bodhi update submission link:
https://admin.fedoraproject.org/updates/new/?type_=security&bugs=782642

Please note: this issue affects multiple supported versions of Fedora.
Only one tracking bug has been filed; please ensure that it is only closed
when all affected versions are fixed.


Reproducers, if any, will remain confidential and never be made public, unless done so by the security team.

[bug automatically created by: add-tracking-bugs]

Comment 1 Josh Boyer 2012-01-18 15:03:56 UTC

This is fixed by upstream commit e268337dfe26dfc7efd422a804dbb27977a3cccc.  I'll backport that to all 3 branches later today.

Note: Fedora defaults to /proc/sys/kernel/randomize_va_space = 2, which makes this more difficult to exploit.

Comment 2 Josh Boyer 2012-01-18 15:12:26 UTC

Committed to all branches.

Comment 3 Fedora Update System 2012-01-23 18:32:02 UTC

kernel-3.2.1-3.fc16 has been submitted as an update for Fedora 16.
https://admin.fedoraproject.org/updates/kernel-3.2.1-3.fc16

Comment 4 Fedora Update System 2012-01-23 18:36:07 UTC

kernel-2.6.41.10-3.fc15 has been submitted as an update for Fedora 15.
https://admin.fedoraproject.org/updates/kernel-2.6.41.10-3.fc15

Comment 5 Eugene Teo (Security Response) 2012-01-24 01:40:38 UTC

Petr reported that the publicly available exploit works on Fedora using gpasswd.
https://bugzilla.redhat.com/show_bug.cgi?id=782642#c26

Comment 6 Fedora Update System 2012-01-24 01:42:42 UTC

Package kernel-2.6.41.10-3.fc15:
* should fix your issue,
* was pushed to the Fedora 15 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing kernel-2.6.41.10-3.fc15'
as soon as you are able to, then reboot.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-0861/kernel-2.6.41.10-3.fc15
then log in and leave karma (feedback).

Comment 7 Fedora Update System 2012-01-24 07:56:29 UTC

kernel-3.2.1-3.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Josh Boyer 2012-01-24 11:50:05 UTC

(In reply to comment #5)
> Petr reported that the publicly available exploit works on Fedora using
> gpasswd.
> https://bugzilla.redhat.com/show_bug.cgi?id=782642#c26

Indeed.  That same exploit does not result in a root shell with the updates mentioned in comment #3 and comment #4

Comment 9 Fedora Update System 2012-01-24 19:58:00 UTC

kernel-2.6.41.10-3.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.