Bug 1716328 (CVE-2018-7191)

Summary:	CVE-2018-7191 kernel: denial of service via ioctl call in network tun handling
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, jkacur, john.j5live, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mmilgram, 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 networking tunnel device ioctl. A local attacker can cause a denial of service (NULL pointer dereference and panic) via an ioctl (TUNSETIFF) call with a dev name containing a / character.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-31 22:34:19 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:	1723644, 1723645, 1723646, 1828277, 1828278, 1838778, 1838779
Bug Blocks:	1716331

Description Dhananjay Arunesh 2019-06-03 08:56:27 UTC

In the tun subsystem in the Linux kernel, a local attacker could issue an ioctl to call dev_get_valid_name which is not called before register_netdevice. This allows local users to cause a denial of service (NULL pointer dereference and panic) via an ioctl(TUNSETIFF) call with a dev name containing a / character.

Reference:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1743792
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.14

Commits:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ad646c81b2182f7fa67ec0c8c825e0ee165696d
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c25f65fd1e42685f7ccd80e0621829c105785d9

Comment 1 Dhananjay Arunesh 2019-06-03 09:07:05 UTC

Note: I have also filed affect for rhel-8 as "new", just to double check and confirm weather rhel-8 is affected or not.

Comment 7 errata-xmlrpc 2020-03-31 19:11:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1016 https://access.redhat.com/errata/RHSA-2020:1016

Comment 8 errata-xmlrpc 2020-03-31 19:20:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1070 https://access.redhat.com/errata/RHSA-2020:1070

Comment 9 Product Security DevOps Team 2020-03-31 22:34:19 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-2018-7191

Comment 14 errata-xmlrpc 2020-06-11 02:10:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.7 Extended Update Support

Via RHSA-2020:2522 https://access.redhat.com/errata/RHSA-2020:2522

Comment 16 errata-xmlrpc 2020-07-07 09:51:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2020:2851 https://access.redhat.com/errata/RHSA-2020:2851