Bug 1399519 (CVE-2016-9313)

Summary:	CVE-2016-9313 kernel: security/keys/big_key.c mishandles unsuccessful crypto registration
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, ichavero, itamar, jforbes, jkacur, jkastner, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, vdronov, williams, wmealing, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	The implementation of big key management in security/keys/big_key.c in the Linux kernel before 4.8.7 mishandles unsuccessful crypto registration in conjunction with successful key-type registration, which allows local users to cause a denial of service (NULL pointer dereference and panic) or possibly have unspecified other impact via a crafted application that uses the big_key data type.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-01-25 15:33:20 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:	1399522
Bug Blocks:	1399529

Description Andrej Nemec 2016-11-29 09:06:13 UTC

The linux kernels implementation of "big key" management in security/keys/big_key.c in the Linux kernel before 4.8.7 mishandles unsuccessful
crypto registration in conjunction with successful key-type registration, which
allows local users to cause a denial of service (NULL pointer dereference and
panic) or possibly have unspecified other impact via a crafted application that
uses the big_key data type.

As per the patch notes the Red Hat Enterprise Linux code contains neither big_key_rng and big_key_blkcipher, which can be set to null.  The Red Hat Enterprise Linux source contains no blkcipher code to be affected.

References:

http://seclists.org/oss-sec/2016/q3/130

Upstream patch:

https://github.com/torvalds/linux/commit/7df3e59c3d1df4f87fe874c7956ef7a3d2f4d5fb

Comment 1 Andrej Nemec 2016-11-29 09:08:37 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1399522]

Comment 2 Justin M. Forbes 2016-11-29 16:54:52 UTC

This was fixed in the 4.8.7 kernel update which was available to all fedora releases on November 17 2016

Comment 3 Wade Mealing 2016-12-21 01:53:30 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5,6 and 7 as the code with the flaw is not present in the products listed.