Bug 1324749 (CVE-2016-3672)

Summary:	CVE-2016-3672 kernel: unlimiting the stack disables ASLR
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
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, arm-mgr, bhu, carnil, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, mmilgram, nmurray, plougher, rt-maint, rvrbovsk, slawomir, vdronov, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A weakness was found in the Linux ASLR implementation. Any user able to running 32-bit applications in a x86 machine can disable ASLR by setting the RLIMIT_STACK resource to unlimited.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:50:23 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:	1324750, 1327188, 1327189, 1327190, 1836957
Bug Blocks:	1324751

Description Andrej Nemec 2016-04-07 07:55:36 UTC

A weakness was found in the Linux ASLR implementation. Any user able to running 32-bit applications in a x86 machine can disable the ASLR by setting the RLIMIT_STACK resource to unlimited.

External references:

http://hmarco.org/bugs/CVE-2016-3672-Unlimiting-the-stack-not-longer-disables-ASLR.html
http://seclists.org/bugtraq/2016/Apr/34

Upstream fix:

http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=8b8addf891de8a00e4d39fc32f93f7c5eb8feceb

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8b8addf891de8a00e4d39fc32f93f7c5eb8feceb

Comment 1 Andrej Nemec 2016-04-07 07:56:39 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1324750]

Comment 7 Vladis Dronov 2016-04-14 12:42:47 UTC

Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6. 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/.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.

Comment 8 Fedora Update System 2016-04-17 23:40:32 UTC

kernel-4.5.1-300.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2016-04-19 19:23:27 UTC

kernel-4.4.7-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 10 Fedora Update System 2016-05-06 19:53:07 UTC

kernel-4.4.8-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 11 errata-xmlrpc 2018-04-10 08:03:24 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:0676

Comment 12 errata-xmlrpc 2018-04-10 09:27:01 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:1062 https://access.redhat.com/errata/RHSA-2018:1062