Bug 1349741 (CVE-2016-5011)

Summary:	CVE-2016-5011 util-linux: Extended partition loop in MBR partition table leads to DOS
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:	carnil, cbuissar, kzak, security-response-team, slawomir
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	It was found that util-linux's libblkid library did not properly handle Extended Boot Record (EBR) partitions when reading MS-DOS partition tables. An attacker with physical USB access to a protected machine could insert a storage device with a specially crafted partition table that could, for example, trigger an infinite loop in systemd-udevd, resulting in a denial of service on that machine.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-04 08:57:21 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:	1349536, 1354450
Bug Blocks:	1349742

Description Andrej Nemec 2016-06-24 06:57:34 UTC

By connecting a storage medium containing a specially crafted MBR a local user can cause a Linux system to become unresponsive.

Product bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1349536

Comment 1 Andrej Nemec 2016-06-24 06:57:40 UTC

Acknowledgments:

Name: Michael Gruhn
Upstream: Christian Moch

Comment 2 Cedric Buissart 2016-07-11 07:30:07 UTC

Patch : upstream commit 7164a1c34d18831ac61c6744ad14ce916d389b3f :
https://git.kernel.org/cgit/utils/util-linux/util-linux.git/commit/?id=7164a1c3

Comment 3 Cedric Buissart 2016-07-11 11:00:18 UTC

Created util-linux tracking bugs for this issue:

Affects: fedora-all [bug 1354450]

Comment 5 Cedric Buissart 2016-07-12 15:24:49 UTC

Additional patch, to prevent non-zero recursion :
https://github.com/karelzak/util-linux/commit/50d1594c2e6142a3b51d2143c74027480df082e0

Comment 8 errata-xmlrpc 2016-11-03 21:27:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2605 https://rhn.redhat.com/errata/RHSA-2016-2605.html