Bug 1404200 (CVE-2016-10147)

Summary:	CVE-2016-10147 kernel: Kernel crash by spawning mcrypt(alg) with incompatible algorithm
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, dhoward, fhrbata, iboverma, jkacur, joelsmith, jross, kernel-mgr, lgoncalv, mcressma, nmurray, pholasek, rvrbovsk, security-response-team, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Algorithms not compatible with mcryptd could be spawned by mcryptd with a direct crypto_alloc_tfm invocation using a "mcryptd(alg)" name construct. This causes mcryptd to crash the kernel if an arbitrary "alg" is incompatible and not intended to be used with mcryptd.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-21 11:49:09 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:	1402133, 1413977
Bug Blocks:	1404201

Description Adam Mariš 2016-12-13 10:20:04 UTC

Algorithms not compatible with mcryptd could be spawned by mcryptd with a direct crypto_alloc_tfm invocation using a "mcryptd(alg)" name construct.  This causes mcryptd to crash the kernel if an arbitrary "alg" is incompatible and not intended to be used with mcryptd.

This could be a potential attack to crash the kernel by user program using AF_ALG to request an invalid algorithm such as mcryptd(md5).

Upstream report:

https://marc.info/?l=dm-devel&m=148063708010538&w=2

Suggested Patch:

http://marc.info/?l=linux-crypto-vger&m=148096718218312&w=2

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd

CVE-ID request and assignment:

http://seclists.org/oss-sec/2017/q1/118

http://seclists.org/oss-sec/2017/q1/127

Comment 4 Vladis Dronov 2017-01-17 13:45:05 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG-2 as the flaw is not present in the products listed.

Comment 6 errata-xmlrpc 2017-08-01 19:11:36 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077

Comment 7 errata-xmlrpc 2017-08-02 07:51:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842