Bug 1181054 (CVE-2014-9585)

Summary:	CVE-2014-9585 kernel: ASLR bruteforce possible for vdso library
Product:	[Other] Security Response	Reporter:	Vasyl Kaigorodov <vkaigoro>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	aquini, bhu, ccoleman, dhoward, dmcphers, fhrbata, gansalmon, iboverma, itamar, jaeshin, jforbes, jialiu, jkacur, joelsmith, jokerman, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lmeyer, madhu.chinakonda, matt, mchehab, mcressma, mmccomas, mmcgrath, nmurray, plougher, pmatouse, ppandit, rt-maint, rvrbovsk, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	An information leak flaw was found in the way the Linux kernel's Virtual Dynamic Shared Object (vDSO) implementation performed address randomization. A local, unprivileged user could use this flaw to leak kernel memory addresses to user-space.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:37:44 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:	1181056, 1184896, 1184897, 1184898, 1184899, 1184901, 1252883, 1252884, 1423407
Bug Blocks:	1177829

Description Vasyl Kaigorodov 2015-01-12 09:56:59 UTC

Linux kernel built with the Virtual Dynamic Shared Object(vDSO) support is
vulnerable to an information leakage flaw. It occurs due to less than perfect
address randomisation, which leads to leakage of vDSO library base address.

An unprivileged user could use this flaw to leak kernel memory addresses.

Upstream fix:
-------------
  -> https://git.kernel.org/linus/394f56fe480140877304d342dec46d50dc823d46

Reference:
----------
  -> http://seclists.org/oss-sec/2015/q1/103
  -> https://bugzilla.kernel.org/show_bug.cgi?id=89591
  -> http://marc.info/?l=linux-kernel&m=141909723019695&w=2

Comment 1 Vasyl Kaigorodov 2015-01-12 09:58:56 UTC

The fix above is in upstream already:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/x86/vdso/vma.c?id=394f56fe480140877304d342dec46d50dc823d46

Comment 2 Vasyl Kaigorodov 2015-01-12 10:00:19 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1181056]

Comment 4 Prasad Pandit 2015-01-22 12:24:03 UTC

Statement:

This issue affects the versions of the Linux kernel as shipped with
Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future kernel
updates for Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2 may
address this issue.


Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and
maintenance life cycle. This has been rated as having Low security
impact and is not currently planned to be addressed in future updates. For
additional information, refer to the Red Hat Enterprise Linux Life
Cycle: https://access.redhat.com/support/policy/updates/errata/.

Comment 7 Fedora Update System 2015-01-26 02:31:09 UTC

kernel-3.18.3-201.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 errata-xmlrpc 2015-06-09 14:48:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:1081 https://rhn.redhat.com/errata/RHSA-2015-1081.html

Comment 11 errata-xmlrpc 2015-09-15 09:23:26 UTC

This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2015:1787 https://rhn.redhat.com/errata/RHSA-2015-1787.html

Comment 12 errata-xmlrpc 2015-09-15 09:39:19 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1788 https://rhn.redhat.com/errata/RHSA-2015-1788.html

Comment 13 errata-xmlrpc 2015-09-15 12:06:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1778 https://rhn.redhat.com/errata/RHSA-2015-1778.html