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             AUSCERT External Security Bulletin Redistribution

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


        AusCERT Security Bulletin Summary

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

Original Bulletin: 

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

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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
                     Mac OS
Edition            : Liberty


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

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| -|


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 - 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 or later (targeted availability 4Q2022).

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

Workarounds and Mitigations


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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