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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1359
  Security Bulletin: WebSphere Application Server is vulnerable to an XML
      External Entity (XXE) Injection vulnerability (CVE-2021-20454)
                               21 April 2021

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

Product:           WebSphere Application Server
Publisher:         IBM
Operating System:  IBM i
                   Linux variants
                   AIX
                   HP-UX
                   Solaris
                   Windows
                   z/OS
Impact/Access:     Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-20454  

Original Bulletin: 
   https://www.ibm.com/support/pages/node/6445481

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than IBMi. It is recommended that administrators 
         running WebSphere Application Server check for an updated version of
         the software for their operating system.

- --------------------------BEGIN INCLUDED TEXT--------------------

WebSphere Application Server is vulnerable to an XML External Entity (XXE)
Injection vulnerability (CVE-2021-20454)

Document Information

Document number    : 6445481
Modified date      : 20 April 2021
Product            : WebSphere Application Server
Software version   : 7.0, 8.0, 8.5, 9.0
Operating system(s): AIX
                     HP-UX
                     IBM i
                     Linux
                     Solaris
                     Windows
                     z/OS
Edition            : Advanced,Base,Developer,Enterprise,Express,Network Deployment,Single Server

Summary

WebSphere Application Server is vulnerable to an XML External Entity (XXE)
Injection vulnerability. This has been addressed.

Vulnerability Details

CVEID: CVE-2021-20454
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: 8.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
196649 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L)

Affected Products and Versions

+----------------------------+----------+
|Affected Product(s)         |Version(s)|
+----------------------------+----------+
|WebSphere Application Server|9.0       |
+----------------------------+----------+
|WebSphere Application Server|8.5       |
+----------------------------+----------+
|WebSphere Application Server|8.0       |
+----------------------------+----------+
|WebSphere Application Server|7.0       |
+----------------------------+----------+

Remediation/Fixes

For WebSphere Application Server traditional and WebSphere Application Server
Hypervisor Edition:

For V9.0.0.0 through 9.0.5.7:
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH34048
- --OR--
. Apply Fix Pack 9.0.5.8 or later (targeted availability 2Q2021).

For V8.5.0.0 through 8.5.5.19:
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH34048
- --OR--
. Apply Fix Pack 8.5.5.20 or later (targeted availability 3Q2021).

For V8.0.0.0 through 8.0.0.15:
. Upgrade to 8.0.0.15 and then apply Interim Fix PH34048

For V7.0.0.0 through 7.0.0.45:
. Upgrade to 7.0.0.45 and then apply Interim Fix PH34048

Additional interim fixes may be available and linked off the interim fix
download page.

WebSphere Application Server V7.0 and V8.0 are no longer in full support; IBM
recommends upgrading to a fixed, supported version/release/platform of the
product.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Complete CVSS v3 Guide
On-line Calculator v3

Off

Acknowledgement

This vulnerability was reported to IBM by r00t4dm at Cloud-Penetrating Arrow
Lab, Longofo of Knownsec 404 Team

Change History

20 Apr 2021: Initial Publication

Document Location

Worldwide

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