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Category:   Application (Security)  >   Red Hat Single Sign-On Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Single Sign-On) Red Hat JBoss EAP XML Deserialization Flaw in SLF4J Component Lets Remote Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1040834
SecurityTracker URL:  http://securitytracker.com/id/1040834
CVE Reference:   CVE-2018-8088   (Links to External Site)
Date:  May 4 2018
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Red Hat JBoss Enterprise Application Platform (EAP). A remote user can execute arbitrary code on the target system. Red Hat Single Sign-On is affected.

A remote user can send specially crafted XML data to trigger a deserialization error in the Simple Logging Facade for Java (SLF4J) EventData constructor and execute arbitrary code on the target system.

Chris McCown reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix for Red Hat Single Sign-On.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:1323

Vendor URL:  access.redhat.com/errata/RHSA-2018:1323 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5, 6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Apr 4 2018 Red Hat JBoss EAP XML Deserialization Flaw in SLF4J Component Lets Remote Users Execute Arbitrary Code on the Target System



 Source Message Contents

Subject:  [RHSA-2018:1323-01] Important: Red Hat Single Sign-On 7.2.2 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: Red Hat Single Sign-On 7.2.2 security update
Advisory ID:       RHSA-2018:1323-01
Product:           Red Hat Single Sign-On
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1323
Issue date:        2018-05-04
CVE Names:         CVE-2018-8088 
=====================================================================

1. Summary:

Red Hat Single Sign-On 7.2.2 is now available for download from the
Customer Portal.

Red Hat Product Security has rated this update as having a security impact
of Important. 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. Description:

Red Hat Single Sign-On 7.2 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 7.2.2 serves as a replacement for
Red Hat Single Sign-On 7.2.1, and includes several bug fixes and
enhancements. For further information, refer to the Release Notes linked to
in the References section.

Security Fix(es):

* slf4j: Deserialisation vulnerability in EventData constructor can allow
for arbitrary code execution (CVE-2018-8088)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Red Hat would like to thank Chris McCown for reporting this issue.

3. Solution:

Before applying the update, back up your existing installation, including
all applications, configuration files, databases and database settings, and
so on.

The References section of this erratum contains a download link (you must
log in to download the update).

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

1548909 - CVE-2018-8088 slf4j: Deserialisation vulnerability in EventData constructor can allow for arbitrary code execution

5. References:

https://access.redhat.com/security/cve/CVE-2018-8088
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?downloadType=securityPatches&product=core.service.rhsso&version=7.2
https://access.redhat.com/documentation/en-us/red_hat_single_sign_on/?version=7.2

6. Contact:

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

Copyright 2018 Red Hat, Inc.
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