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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3619
        Potential XML External Entity (XXE) Injection Vulnerability
                      in WebSphere Application Server
                             21 November 2018

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

Product:           IBM WebSphere Application Server
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   IBM i
                   Linux variants
                   Solaris
                   Windows
                   z/OS
Impact/Access:     Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1905  

Original Bulletin: 
   https://www.ibm.com/support/docview.wss?uid=ibm10738721

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Security Bulletin: Potential XML External Entity (XXE) Injection Vulnerability
in WebSphere Application Server (CVE-2018-1905)

Security Bulletin

Document information

More support for: WebSphere Application Server

Software version: 9.0

Operating system(s): AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS

Software edition: Advanced, Base, Developer, Enterprise, Express, Network
Deployment, Single Server

Reference #: 0738721

Modified date: 20 November 2018

Summary

There is a potential XXE injection vulnerability in the Knowledge Center used
by WebSphere Application Server.

Vulnerability Details

CVEID: CVE-2018-1905
DESCRIPTION: IBM WebSphere Application Server is vulnerable to a XML External
Entity Injection (XXE) attack when processing XML data. A remote attacker could
exploit this vulnerability to expose sensitive information or consume memory
resources.
CVSS Base Score: 7.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
152534 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L)

Affected Products and Versions

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

  o Version 9.0

Remediation/Fixes

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

For WebSphere Application Server traditional:

For V9.0.0.0 through 9.0.0.9:
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH04192
- --OR--
. Apply Fix Pack 9.0.0.10 or later (targeted availability 4Q 2018).

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

Acknowledgement

The vulnerability was reported to IBM by Benoit Cote-Jodoin from GoSecure

Change History

20 November 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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