Bug 1747334 (CVE-2019-15666)

Summary:	CVE-2019-15666 kernel: out-of-bounds array access in __xfrm_policy_unlink
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
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, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mickygough, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, sdubroca, steved, williams, wmealing, yozone
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. When xfrm policy removal occurs a system crash could occur. These policy changes generally occur through the ip command or a netlink socket.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-16 16:31:57 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:	1718812, 1747335, 1803667, 1803668, 1803669, 1803670, 1803671
Bug Blocks:	1747336

Description Dhananjay Arunesh 2019-08-30 07:12:00 UTC

A flaw regarding the removal of xfrm policies from the kernel may possibly crash the system or corrupt memory or escalate privilges . Policies addition or removal is a privileged operation (usually done through the ip command) or via a netlink socket.

A local privileged user (with CAP_NET_ADMIN or root) is required to exploit this condition.  With this limitation, this issue is rated as Moderate.

Reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b805d78d300bcf2c83d6df7da0c818b0fee41427
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.19

Comment 1 Dhananjay Arunesh 2019-08-30 07:12:17 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1747335]

Comment 2 Justin M. Forbes 2019-08-30 12:14:14 UTC

This was fixed for Fedora with the 5.0.19 stable update

Comment 8 Eric Christensen 2020-03-02 21:48:25 UTC

Statement:

A local privileged user (with CAP_NET_ADMIN or root) is required to exploit this condition. With this limitation, this issue is rated as Moderate.

Comment 9 errata-xmlrpc 2020-04-16 14:38:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1493 https://access.redhat.com/errata/RHSA-2020:1493

Comment 10 Product Security DevOps Team 2020-04-16 16:31:57 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-2019-15666