Bug 1603420 (CVE-2018-14345)

Summary:	CVE-2018-14345 sddm: Password not checked for users with an already existing session if ReuseSession=true
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jgrulich, me, m, pierluigi.fiorini, rdieter
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:	2019-06-10 10:33:40 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1603423, 1603424
Bug Blocks:

Description Andrej Nemec 2018-07-19 14:48:20 UTC

An issue was discovered in SDDM through 0.17.0. If configured with ReuseSession=true, the password is not checked for users with an already existing session. Any user with access to the system D-Bus can therefore unlock any graphical session. This is related to daemon/Display.cpp and helper/backend/PamBackend.cpp.

Upstream patch:

https://github.com/sddm/sddm/commit/147cec383892d143b5e02daa70f1e7def50f5d98

Comment 1 Andrej Nemec 2018-07-19 14:48:54 UTC

Created sddm tracking bugs for this issue:

Affects: epel-7 [bug 1603424]
Affects: fedora-all [bug 1603423]

Comment 2 Product Security DevOps Team 2019-06-10 10:33:40 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.