Bug 1485246 (CVE-2017-13715)

Summary:	CVE-2017-13715 kernel: Use of uninitialized value in __skb_flow_dissect()
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, eparis, esammons, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, m.a.young, mchehab, mcressma, mguzik, mjg59, mlangsdo, nhorman, nmurray, plougher, quintela, rt-maint, rvrbovsk, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.3	Doc Type:	Bug Fix
Doc Text:	It was found that in the Linux kernel version 4.2-rc1 to 4.3-rc1, a use of uninitialized 'n_proto', 'ip_proto', and 'thoff' variables in __skb_flow_dissect() function can lead to a remote denial-of-service via malformed MPLS packet.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-08-28 17:16:09 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:
Bug Blocks:	1485250

Description Adam Mariš 2017-08-25 08:08:10 UTC

It was found that in the Linux kernel v4.2-rc1 to v4.3-rc1 a use of uninitialized 'n_proto', 'ip_proto' and 'thoff' variables in __skb_flow_dissect() function can lead to a remote denial-of-service via malformed MPLS packet.

Reference:

http://seclists.org/oss-sec/2017/q3/345

Introduced by:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3baa0fbd02a1a9d493d8cb92ae4a4491b9e9d13

Fixed by:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a6e544b0a88b53114bfa5a57e21b7be7a8dfc9d0

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34fad54c2537f7c99d07375e50cb30aa3c23bd83

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9b8af1330198ae241cd545e1f040019010d44d9

Comment 3 Vladis Dronov 2017-08-28 17:16:09 UTC

Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 as the code with the flaw is not present or is already fixed in the products listed.