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[RHSA-2017:2904-01] Moderate: rh-sso7-keycloak security update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Moderate: rh-sso7-keycloak security update
Advisory ID:       RHSA-2017:2904-01
Product:           Red Hat Single Sign-On
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2904
Issue date:        2017-10-17
CVE Names:         CVE-2017-12158 CVE-2017-12159 CVE-2017-12160 

1. Summary:

An update for rh-sso7-keycloak is now available for Red Hat Single Sign-On
7.1 for RHEL 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Single Sign-On 7.1 for RHEL 6 Server - noarch

3. Description:

Red Hat Single Sign-On is a standalone server, based on the Keycloak
project, that provides authentication and standards-based single sign-on
capabilities for web and mobile applications.

This release of Red Hat Single Sign-On 7.1.3 serves as a replacement for
Red Hat Single Sign-On 7.1.2, and includes several bug fixes and
enhancements. For further information, refer to the Release Notes linked to
in the References section.

Security Fix(es):

* It was found that keycloak would accept a HOST header URL in the admin
console and use it to determine web resource locations. An attacker could
use this flaw against an authenticated user to attain reflected XSS via a
malicious server. (CVE-2017-12158)

* It was found that the cookie used for CSRF prevention in Keycloak was not
unique to each session. An attacker could use this flaw to gain access to
an authenticated user session, leading to possible information disclosure
or further attacks. (CVE-2017-12159)

* It was found that libpam4j did not properly validate user accounts when
authenticating. A user with a valid password for a disabled account would
be able to bypass security restrictions and possibly access sensitive
information. (CVE-2017-12197)

* It was found that Keycloak oauth would permit an authenticated resource
to obtain an access/refresh token pair from the authentication server,
permitting indefinite usage in the case of permission revocation. An
attacker on an already compromised resource could use this flaw to grant
himself continued permissions and possibly conduct further attacks.

Red Hat would like to thank Mykhailo Stadnyk (Playtech) for reporting
CVE-2017-12158; Prapti Mittal for reporting CVE-2017-12159; and Bart
Toersche (Simacan) for reporting CVE-2017-12160. The CVE-2017-12197 issue
was discovered by Christian Heimes (Red Hat).

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:


5. Bugs fixed (https://bugzilla.redhat.com/):

1484111 - CVE-2017-12159 keycloak: CSRF token fixation
1484154 - CVE-2017-12160 keycloak: resource privilege extension via access token in oauth
1489161 - CVE-2017-12158 keycloak: reflected XSS using HOST header
1503103 - CVE-2017-12197 libpam4j: Account check bypass

6. JIRA issues fixed (https://issues.jboss.org/):

RHSSO-1121 - Tracker bug for the RH-SSO 7.1.3 release for RHEL-6

7. Package List:

Red Hat Single Sign-On 7.1 for RHEL 6 Server:



These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

8. References:


9. Contact:

The Red Hat security contact is <secalert redhat com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
Version: GnuPG v1


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