Bug 1343335 (CVE-2016-5243)

Summary:	CVE-2016-5243 kernel: Information leak in tipc_nl_compat_link_dump
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, 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 leak of information was possible when issuing a netlink command of the stack memory area leading up to this function call. An attacker could use this to determine stack information for use in a later exploit.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-06-29 13:41:32 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:	1343338, 1348017
Bug Blocks:	1343340

Description Andrej Nemec 2016-06-07 07:41:50 UTC

A vulnerability was found in the Linux kernel. 
There is a char array of size 60 in function tipc_nl_compat_link_dump of file net/tipc/netlink_compat.c, link_info.str. Memory after the NULL byte is not initialized. Sending the whole object out can cause a leak of sensitive info in kernel stack.

Upstream bug:

https://patchwork.ozlabs.org/patch/629100/

Upstream fix:

https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=5d2be1422e02ccd697ccfcd45c85b4a26e6178e2

Comment 1 Andrej Nemec 2016-06-07 07:47:25 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1343338]

Comment 2 Fedora Update System 2016-06-17 15:49:27 UTC

kernel-4.4.13-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-06-17 15:59:44 UTC

kernel-4.5.7-200.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-06-18 18:36:02 UTC

kernel-4.5.7-300.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Wade Mealing 2016-06-20 01:02:08 UTC

Statement:

This issue does not affect Red Hat Enterprise Linux 5,6 or 7 kernels as it does not contain the code that has introduced the flaw.