Bug 1395190 (CVE-2016-10208)

Summary:	CVE-2016-10208 kernel: EXT4 memory corruption / SLAB out-of-bounds read
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, arm-mgr, bhu, dhoward, fhrbata, fweimer, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, pholasek, plougher, ppandit, rt-maint, rvrbovsk, slawomir, vdronov, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	Mounting a crafted EXT4 image read-only leads to an attacker controlled memory corruption and SLAB-Out-of-Bounds reads.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:02:05 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:	1332503, 1430968, 1430969, 1430970, 1430971, 1430972, 1444529, 1459302
Bug Blocks:	1395193

Description Andrej Nemec 2016-11-15 11:39:14 UTC

Mounting a crafted EXT4 image read-only leads to a memory corruption and SLAB-Out-of-Bounds Reads (according to KASAN). Automounting a disk image either as USB or loopback is not configured by default on servers but is enabled on desktop environments.

Attackers with a remote connection will likely be unable to trigger this vulnerability on the commandline. Instead the automatic mounting feature of the GUI via a crafted USB-device is required.

The system will likely panic with a page fault, but attackers may be able to map another page in the correct location and be able to overwrite or corrupt memory possibly leading to privilege escalation. 

References:

http://seclists.org/fulldisclosure/2016/Nov/75

Product bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1332503

Upstream patch:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3a4b77cd47bb837b8557595ec7425f281f2ca1fe

Introduced in:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=952fc18ef9ec707ebdc16c0786ec360295e5ff15

Comment 3 Wade Mealing 2016-11-25 07:11:36 UTC

Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7, MRG-2 and realtime kernels. This has been rated as having Moderate security impact and is currently planned to be addressed in future updates.

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.

Comment 4 Wade Mealing 2017-03-10 02:24:08 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1430968]

Comment 6 Justin M. Forbes 2017-03-10 13:51:20 UTC

This was fixed for all fedora releases on 2017-02-14 in the 4.9.9 stable update.

Comment 8 errata-xmlrpc 2017-05-25 13:30:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:1297 https://access.redhat.com/errata/RHSA-2017:1297

Comment 9 errata-xmlrpc 2017-05-25 13:41:24 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1298 https://access.redhat.com/errata/RHSA-2017:1298

Comment 10 errata-xmlrpc 2017-05-25 15:38:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1308 https://access.redhat.com/errata/RHSA-2017:1308