Bug 1547824 (CVE-2018-1065)

Summary:	CVE-2018-1065 kernel: netfilter: xtables NULL pointer dereference in ip6_tables.c:ip6t_do_table() leading to a crash
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, skozina, steved, 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:	A flaw was found in the netfilter/iptables subsystem. A user with the netfilter modification capabilities could insert a rule which could panic the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:40:49 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:	1547827, 1547831, 1550791
Bug Blocks:	1542365

Description Sam Fowler 2018-02-22 03:32:40 UTC

The Linux kernel at version 4.15.0-rc9 is vulnerable to a NULL pointer dereference ip6_tables.c:ip6t_do_table() leading to a crash. This vulnerability is only present under certain malformed iptables rulesets.

Inserting malformed rules its a privileged operation as root or a user with CAP_NET_RAW,CAP_NET_ADMIN capabilities ( see man setcap(8) ).

As this requires advanced privileges Red Hat Product Security has rated this flaw as moderate.

Additional References:

Netdev list:
http://lists.openwall.net/netdev/2018/01/27/46

A suggested upstream patch:
http://patchwork.ozlabs.org/patch/870355/

An upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=57ebd808a97d7

Comment 3 Sam Fowler 2018-02-22 04:12:55 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1547831]

Comment 10 errata-xmlrpc 2018-10-30 08:57:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948