Bug 1758256 (CVE-2019-17056)

Summary:	CVE-2019-17056 kernel: unprivileged access to llcp_sock_create in net/nfc/llcp_sock.c in the AF_NFC socket type.
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jschorr, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, steved, 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:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-12-04 07:04:51 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:	1758257
Bug Blocks:	1758258

Description Dhananjay Arunesh 2019-10-03 16:57:02 UTC

A vulnerability was found in llcp_sock_create in net/nfc/llcp_sock.c in the AF_NFC network module in the Linux kernel does not enforce CAP_NET_RAW, which means that unprivileged users can create a raw socket.

Reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0edc3f703f7bcaf550774b5d43ab727bcd0fe06b
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3a359798b176183ef09efb7a3dc59abad1cc7104

Comment 1 Dhananjay Arunesh 2019-10-03 16:59:00 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1758257]

Comment 2 Fedora Update System 2019-10-25 18:06:49 UTC

kernel-5.3.6-100.fc29, kernel-headers-5.3.6-100.fc29, kernel-tools-5.3.6-100.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Wade Mealing 2019-12-04 02:32:25 UTC

Its kinda hard to consider this to be privilege escalation.  It may be expected that raw sockets are not available to all users most people think of "networked" sockets, not this NFC protocol.

In addition, no shipping versions of RHEL support this protocol.

Comment 4 Product Security DevOps Team 2019-12-04 07:04:51 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-2019-17056