Bug 1712072 (CVE-2019-11833)

Summary:	CVE-2019-11833 kernel: fs/ext4/extents.c leads to information disclosure
Product:	[Other] Security Response	Reporter:	msiddiqu
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, esandeen, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, steved, 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:	A flaw was found in the Linux kernel's implementation of ext4 extent management. The kernel doesn't correctly initialize memory regions in the extent tree block which may be exported to a local user to obtain sensitive information by reading empty/uninitialized data from the filesystem.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-08-06 13:22:29 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:	1712073, 1715275, 1715276, 1715277, 1715278, 1715280, 1715281, 1772270, 1772271, 1772272, 1772273
Bug Blocks:	1712074

Description msiddiqu 2019-05-20 17:41:23 UTC

A flaw was found in the Linux kernels implementation of ext4 extent management which did not correctly initialize memory regions in the extent tree block which may be exported to a local user to obtain sensitive information by reading empty/uninitialized data from the filesystem.

This is considered an information leak, but the information leveraged could be used in to future another attack. 


Upstream patch:

https://github.com/torvalds/linux/commit/592acbf16821288ecdc4192c47e3774a4c48bb64

Comment 1 msiddiqu 2019-05-20 17:41:43 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1712073]

Comment 2 Wade Mealing 2019-05-29 05:30:54 UTC

Statement: 

This is a possible information leak of data that existed in the extent tree blocks.  While the attacker does not have control of what exists in the blocks prior to this point they may be able to glean confidential information or possibly information that could be used to further another attack.

Comment 9 errata-xmlrpc 2019-08-06 12:04:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2029 https://access.redhat.com/errata/RHSA-2019:2029

Comment 10 errata-xmlrpc 2019-08-06 12:07:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2043 https://access.redhat.com/errata/RHSA-2019:2043

Comment 11 Product Security DevOps Team 2019-08-06 13:22:29 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-11833

Comment 13 errata-xmlrpc 2019-11-05 20:35:32 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3309 https://access.redhat.com/errata/RHSA-2019:3309

Comment 14 errata-xmlrpc 2019-11-05 21:06:14 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3517 https://access.redhat.com/errata/RHSA-2019:3517