IBM WebSphere Application Server Liberty: Execute Arbitrary Code/Commands -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3341
  Security Bulletin: Code execution vulnerability with OpenID connect in
           WebSphere Application Server Liberty (CVE-2018-1851)
                              31 October 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM WebSphere Application Server Liberty
Publisher:         IBM
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1851  

Reference:         ESB-2018.3238.2

Original Bulletin: 
   https://www.ibm.com/support/docview.wss?uid=ibm10735105

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Security Bulletin: Code execution vulnerability with OpenID connect in
WebSphere Application Server Liberty (CVE-2018-1851)

Document information

More support for: WebSphere Application Server

Software version: Liberty

Operating system(s): Platform Independent

Software edition: Liberty

Reference #: 0735105

Modified date: 30 October 2018

Security Bulletin

Summary

There is a potential code execution vulnerability in OpenID connect in
WebSphere Application Server Liberty.

Vulnerability Details

CVEID: CVE-2018-1851
DESCRIPTION: IBM WebSphere Application Server OpenID Connect could allow a
remote attacker to execute arbitrary code on the system, caused by improper
deserialization. By sending a specially-crafted request to the RP service, an
attacker could exploit this vulnerability to execute arbitrary code.
CVSS Base Score: 7.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
150999 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

Affected Products and Versions

This vulnerability affects the following versions and releases of IBM WebSphere
Application Server:

  o Liberty

Remediation/Fixes

The recommended solution is to apply the interim fix, Fix Pack or PTF
containing APARs PH03418 for each named product as soon as practical.

For WebSphere Application Server Liberty:
. Upgrade to minimal fix pack levels as required by interim fixes and then
apply Interim Fix PH03418
- --OR--
. Apply Fix Pack 18.0.0.3 or later.

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support
alerts like this.

Important Note

IBM strongly suggests that all System z customers be subscribed to the System z
Security Portal to receive the latest critical System z security and integrity
service. If you are not subscribed, see the instructions on the System z
Security web site. Security and integrity APARs and associated fixes will be
posted to this portal. IBM suggests reviewing the CVSS scores and applying all
security or integrity fixes as soon as possible to minimize any potential risk.

Reference

Complete CVSS v3 Guide
On-line Calculator v3

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

30 October 2018: original document published

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF
ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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