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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3182
           Security Bulletin: Denial of service vulnerability in
           WebSphere Application Server Liberty (CVE-2020-4590)
                             17 September 2020

===========================================================================

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

Product:           IBM WebSphere Application Server Liberty
Publisher:         IBM
Operating System:  Linux variants
                   Windows
                   Mac OS
                   AIX
                   HP-UX
                   Solaris
                   IBM i
                   z/OS
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-4590  

Original Bulletin: 
   https://www.ibm.com/support/pages/node/6333623

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

Denial of service vulnerability in WebSphere Application Server Liberty
(CVE-2020-4590)

Security Bulletin


Document Information

Product: WebSphere Application Server
Software version: Liberty
Operating system(s): AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS, Mac OS
Document number: 6333623
Modified date: 16 September 2020


Summary

WebSphere Application Server Liberty is vulnerable to a denial of service. This
has been addressed.

Vulnerability Details

CVEID: CVE-2020-4590
DESCRIPTION: IBM WebSphere Application Server Liberty running oauth-2.0 or
openidConnectServer-1.0 server features is vulnerable to a denial of service
attack conducted by an authenticated client.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
184650 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

+------------------------------------+-------------------+
|Affected Product(s)                 |Version(s)         |
+------------------------------------+-------------------+
|WebSphere Application Server Liberty|17.0.0.3 - 20.0.0.9|
+------------------------------------+-------------------+

Remediation/Fixes

The recommended solution is to apply the interim fix or Fix Pack containing
APAR PH29368 for each named product as soon as practical.

For WebSphere Application Server Liberty 17.0.0.3 - 20.0.0.9 using the
oauth-2.0 or openidConnectServer-1.0 features:
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH29368
- --OR--
. Apply Liberty Fix Pack 20.0.0.10 or later (targeted availability 4 Q2020 ).

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

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

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