Bug 1743520 (CVE-2017-18509)

Summary:	CVE-2017-18509 kernel: not checking sk_type and protocol in net/ipv6/ip6mr.c leads to general protection fault, or arbitrary code execution
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, 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, mjg59, mlangsdo, nmurray, plougher, 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:	A flaw was found in the Linux kernel’s net/ipv6/ip6mr.c function where setting a specific socket option can cause an inet_csk_listen_stop general protection fault. An attacker with CAP_NET_ADMIN style privileges inside a container, can crash the system or execute arbitrary code when issuing a specially crafted call to configure ipv6 multicast routing.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-08-21 02:47:09 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:	1743914, 1743915
Bug Blocks:	1743521

Description Marian Rehak 2019-08-20 07:37:32 UTC

By setting a specific socket option, an attacker can control a pointer in kernel land and cause an inet_csk_listen_stop general protection fault, or potentially execute arbitrary code under certain circumstances. This affects Linux distributions that use 4.9.x longterm kernels before 4.9.187.

External References:

https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-inetcsklistenstop-gpf

Upstream Patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=99253eb750fda6a644d5188fb26c43bad8d5a745

Comment 4 Wade Mealing 2019-08-21 01:18:30 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1743914]

Comment 5 Wade Mealing 2019-08-21 01:18:33 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1743915]

Comment 7 Wade Mealing 2019-08-21 02:03:03 UTC

Statement: 

At this time none of the Red Hat Enterprse Linux shipping releases are vulnerable to the described flaw.

Comment 8 Product Security DevOps Team 2019-08-21 02:47:09 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-2017-18509

Comment 9 Justin M. Forbes 2019-08-21 12:25:38 UTC

This was fixed in the 4.11 kernel, no currently supported Fedora release was ever vulnerable.