Bug 1706013 (CVE-2019-11503)

Summary:	CVE-2019-11503 snapd: remote attacker able to bypass security restriction
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	go-sig, me, ngompa13
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	snapd 2.39	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:55:01 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:	1706018, 1706019, 1706020, 1706021
Bug Blocks:

Description Dhananjay Arunesh 2019-05-03 12:02:00 UTC

snap-confine as included in snapd before 2.39 did not guard against symlink races when performing the chdir() to the current working directory of the calling user, aka a "cwd restore permission bypass."

Reference:
https://www.openwall.com/lists/oss-security/2019/04/18/4
https://github.com/snapcore/snapd/pull/6642

Comment 1 Dhananjay Arunesh 2019-05-03 12:04:42 UTC

Created snapd tracking bugs for this issue:

Affects: fedora-all [bug 1706018]


Created snapd-glib tracking bugs for this issue:

Affects: fedora-all [bug 1706019]

Comment 2 Dhananjay Arunesh 2019-05-03 12:05:18 UTC

Created snapd tracking bugs for this issue:

Affects: epel-7 [bug 1706020]


Created snapd-glib tracking bugs for this issue:

Affects: epel-7 [bug 1706021]

Comment 3 Product Security DevOps Team 2019-06-10 10:55:01 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.