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             AUSCERT External Security Bulletin Redistribution

                               ESB-2022.4841
 Security Bulletin: IBM WebSphere Application Server Liberty is vulnerable
         to a Denial of Service due to Neko HTML (CVE-2022-24839)
                             29 September 2022

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

Product:           WebSphere Application Server
Publisher:         IBM
Operating System:  AIX
                   IBM i
                   Linux variants
                   Windows
                   macOS
                   z/OS
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-24839  

Original Bulletin: 
   https://www.ibm.com/support/pages/node/6824871

Comment: CVSS (Max):  7.5 CVE-2022-24839 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
         CVSS Source: IBM
         Calculator:  https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

IBM WebSphere Application Server Liberty is vulnerable to a Denial of Service
due to Neko HTML (CVE-2022-24839)

Document Information

Document number    : 6824871
Modified date      : 28 September 2022
Product            : WebSphere Application Server
Component          : Liberty
Software version   : Liberty
Operating system(s): AIX
                     IBM i
                     Linux
                     Windows
                     z/OS
                     Mac OS
Edition            : Liberty

Summary

There is a vulnerability in the Neko HTML library used by IBM WebSphere
Application Server Liberty with the openid-2.0 feature enabled. This has been
addressed.

Vulnerability Details

CVEID: CVE-2022-24839
DESCRIPTION: Sparkle Motion Nokogiri is vulnerable to a denial of service,
caused by a java.lang.OutOfMemoryError exception when parsing ill-formed HTML
markup in the fork of org.cyberneko.html. By sending a specially-crafted
request, a remote attacker could exploit this vulnerability to cause a denial
of service condition.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
224089 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

+----------------------------------------+--------------------+
|Affected Product(s)                     |Version(s)          |
+----------------------------------------+--------------------+
|IBM WebSphere Application Server Liberty|17.0.0.3 - 22.0.0.10|
+----------------------------------------+--------------------+

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now by applying a
currently available interim fix or fix pack that contains the APAR PH48810 . To
determine if a feature is enabled for IBM WebSphere Application Server Liberty,
refer to How to determine if Liberty is using a specific feature .

For IBM WebSphere Application Server Liberty 17.0.0.3 - 22.0.0.10 using the
openid-2.0 feature(s):
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH48810
- --OR--
. Apply Liberty Fix Pack 22.0.0.11 or later (targeted availability 4Q2022).

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

Workarounds and Mitigations

None

To determine if a feature is enabled for IBM WebSphere Application Server
Liberty, refer to How to determine if Liberty is using a specific feature .

Change History

28 Sep 2022: Initial Publication

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