Bug 2056065 (CVE-2021-4120)

Summary:	CVE-2021-4120 snapd: Insufficient validation of snap content interface and layout paths
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	go-sig, maciek.borzecki, me, ngompa13
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	snapd 2.54.3	Doc Type:	If docs needed, set a value
Doc Text:	snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-03-02 21:32:22 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:	2056066, 2056067
Bug Blocks:

Description Mauro Matteo Cascella 2022-02-18 16:47:10 UTC

snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement.

References:
http://www.openwall.com/lists/oss-security/2022/02/18/2
https://bugs.launchpad.net/snapd/+bug/1949368

Comment 1 Mauro Matteo Cascella 2022-02-18 16:47:27 UTC

Created snapd tracking bugs for this issue:

Affects: epel-all [bug 2056066]
Affects: fedora-all [bug 2056067]

Comment 2 Product Security DevOps Team 2022-03-02 21:32:20 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.