Bug 1778265 (CVE-2019-14910)

Summary:	CVE-2019-14910 Keycloak: LDAP authentication accepts invalid passwords when using StartTLS
Product:	[Other] Security Response	Reporter:	Jonathan Christison <jochrist>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aboyko, chazlett, drieden, krathod, pdrozd, pjindal, security-response-team, sparks, sthorger
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in keycloak 7.x where an invalid password is accepted for user authentication when LDAP user federation and STARTTLS is used instead of SSL/TLS from the LDAP server. This can allow an attacker to log into a system using any entry for a password authentication and still gain access to the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-12-03 19:04:59 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:
Bug Blocks:	1778267

Description Jonathan Christison 2019-11-29 16:43:36 UTC

When using Keycloak LDAP user federation with StartTLS any password, valid or invalid will be accepted

Mitigation: 
* If possible use SSL (ldaps) instead
* Disable StartTLS

Comment 3 Paramvir jindal 2019-12-02 10:02:00 UTC

Acknowledgments:

Name: Tero Saarni

Comment 6 Product Security DevOps Team 2019-12-03 19:04:59 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-2019-14910

Comment 10 Eric Christensen 2019-12-06 13:28:02 UTC

Statement:

This flaw does not affect Red Hat's Single Sign On (RHSSO) product and, thus, no patch will be forthcoming.

Comment 11 Eric Christensen 2019-12-06 13:28:04 UTC

Mitigation:

Disabling STARTTLS will fix the authentication flaw but leave the connection to the LDAP server unencrypted. Utilizing LDAPS will add a layer of encryption back to the LDAP connection but only at the SSLv3 level which also poses problems in and of itself.