Bug 920499 - (CVE-2013-0914) CVE-2013-0914 Kernel: sa_restorer information leak
CVE-2013-0914 Kernel: sa_restorer information leak
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20130311,reported=2...
: Security
Depends On: 920503 920504 920505 920506 920508 920509 920510
Blocks: 920455
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Reported: 2013-03-12 05:29 EDT by Prasad J Pandit
Modified: 2015-07-31 03:00 EDT (History)
27 users (show)

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Doc Type: Bug Fix
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Last Closed: 2014-06-10 00:47:35 EDT
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Description Prasad J Pandit 2013-03-12 05:29:18 EDT
Linux kernel is vulnerable to an information leakage flaw. This occurs when
a process calls routine - sigaction() - to access - sa_restorer - parameter.
This parameter points to an address that belongs to its parent process'
address space.

A user could use this flaw to infer address layout of a process.

Reference:
----------
 -> https://lkml.org/lkml/2013/3/11/498
 -> http://www.openwall.com/lists/oss-security/2013/03/11/8
Comment 1 Prasad J Pandit 2013-03-12 05:34:31 EDT
Upstream fix
------------
 -> http://www.spinics.net/lists/mm-commits/msg95304.html
Comment 2 Prasad J Pandit 2013-03-12 05:36:25 EDT
Statement:

This issue affects the version of Linux kernel as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2 may address this issue.
Comment 5 Prasad J Pandit 2013-03-12 05:43:22 EDT
Created kernel tracking bugs for this issue

Affects: fedora-all [bug 920510]
Comment 6 Josh Boyer 2013-03-12 09:30:01 EDT
(In reply to comment #1)
> Upstream fix
> ------------
>  -> http://www.spinics.net/lists/mm-commits/msg95304.html

That's the fix for 3.9.  It's worth pointing out that __ARCH_HAS_SA_RESTORER was added in 3.9, so using that patch as-is on older kernels without that change will build but won't do anything.  Using SA_RESTORER works for kernels older than 3.9-rcX.

https://lkml.org/lkml/2013/3/11/545
Comment 7 Fedora Update System 2013-03-16 21:07:26 EDT
kernel-3.8.3-201.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 Fedora Update System 2013-03-21 20:18:38 EDT
kernel-3.8.3-103.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 errata-xmlrpc 2013-05-20 12:50:59 EDT
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2013:0829 https://rhn.redhat.com/errata/RHSA-2013-0829.html
Comment 11 errata-xmlrpc 2013-07-09 23:52:45 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:1034 https://rhn.redhat.com/errata/RHSA-2013-1034.html
Comment 12 errata-xmlrpc 2013-07-16 13:26:02 EDT
This issue has been addressed in following products:

  OpenStack 3 for RHEL 6

Via RHSA-2013:1080 https://rhn.redhat.com/errata/RHSA-2013-1080.html
Comment 13 errata-xmlrpc 2013-07-16 14:23:48 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:1051 https://rhn.redhat.com/errata/RHSA-2013-1051.html

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