Bug 1678313 (CVE-2019-3890)

Summary:	CVE-2019-3890 evolution-ews: all certificate errors ignored if error is ignored during initial account setup in gnome-online-accounts
Product:	[Other] Security Response	Reporter:	msiddiqu
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mcrha
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	evolution-ewx 3.31.3	Doc Type:	If docs needed, set a value
Doc Text:	It was discovered evolution-ews does not check the validity of SSL certificates. An attacker could abuse this flaw to get confidential information by tricking the user into connecting to a fake server without the user noticing the difference.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-06 00:52:14 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:	1678314, 1696760, 1696761, 1696762, 1696763
Bug Blocks:	1678315

Description msiddiqu 2019-02-18 13:35:20 UTC

Evolution Exchange Web Services can silently ignore *all* certificate errors if configured to ignore an initial error in gnome-online-accounts creation. This renders transport security worse than zero as it does not even indicate (logs or UI) that a questionable certificate was presented, leaving the connection open to being viewed and modified.

Upstream issue:

https://gitlab.gnome.org/GNOME/evolution-ews/issues/36

Comment 1 msiddiqu 2019-02-18 13:35:33 UTC

Created evolution-ews tracking bugs for this issue:

Affects: fedora-all [bug 1678314]

Comment 2 Milan Crha 2019-02-18 14:29:01 UTC

Thanks for a bug report. The upstream bug had been marked as a duplicate of an older bug there. I'd prefer not to duplicate the work here, also because the upstream changes are not tested yet and because the change requires changes on the evolution-data-server side as well. I'd commit it to the stable version already otherwise.

Comment 9 Riccardo Schirone 2019-04-05 14:45:41 UTC

Upstream patch:
https://gitlab.gnome.org/GNOME/evolution-ews/commit/915226eca9454b8b3e5adb6f2fff9698451778de
https://gitlab.gnome.org/GNOME/evolution-data-server/commit/6672b8236139bd6ef41ecb915f4c72e2a052dba5

Comment 10 Riccardo Schirone 2019-04-05 14:48:28 UTC

Upstream issue:
https://gitlab.gnome.org/GNOME/evolution-ews/issues/27

Comment 11 Riccardo Schirone 2019-04-05 15:02:39 UTC

According to https://gitlab.gnome.org/GNOME/evolution-ews/issues/27, evolution-ews does not validate SSL certificate at all.

Comment 13 errata-xmlrpc 2019-11-05 22:05:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3699 https://access.redhat.com/errata/RHSA-2019:3699

Comment 14 Product Security DevOps Team 2019-11-06 00:52:14 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-2019-3890

Comment 15 errata-xmlrpc 2020-03-31 19:21:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1080 https://access.redhat.com/errata/RHSA-2020:1080