Bug 1781668 (CVE-2019-19449)

Summary:	CVE-2019-19449 kernel: mounting a crafted f2fs filesystem image can lead to slab-out-of-bounds read access in f2fs_build_segment_manager in fs/f2fs/segment.c
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	acaringi, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jschorr, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, rkeshri, rt-maint, rvrbovsk, steved, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An out of bounds (OOB) memory access flaw was found in the Linux kernel's F2FS file system. A local attacker could use this vulnerability to crash the system or leak kernel internal information.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-07 10:31:50 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:	1781669
Bug Blocks:	1781670

Description Marian Rehak 2019-12-10 11:29:09 UTC

An out of bounds (OOB) memory access flaw was found in the Linux kernel's F2FS file system in init_min_max_mtime in s/f2fs/segment.c. This could allow a local attacker to crash the system or leak kernel internal information.

External Reference:

https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19449

Comment 1 Marian Rehak 2019-12-10 11:29:37 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1781669]

Comment 4 Rohit Keshri 2020-04-07 09:10:50 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 7 Product Security DevOps Team 2020-04-07 10:31:50 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-2019-19449

Comment 8 Eric Christensen 2020-04-07 19:09:51 UTC

Statement:

This issue did not affect Red Hat Enterprise Linux 5, 6, 7, and 8 as the kernel package never contained the code and is currently not provided in any of our supported products.