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AUSCERT External Security Bulletin Redistribution
ESB-2023.6805
IBM WebSphere Application Server Liberty, which is bundled with IBM
WebSphere Hybrid Edition, is vulnerable to denial of service due to HTTP/2
Rapid Reset vulnerability (CVE-2023-44487)
16 November 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM WebSphere Hybrid Edition
Publisher: IBM
Operating System: Windows
AIX
macOS
IBM i
HP-UX
z/OS
Resolution: Patch/Upgrade
CVE Names: CVE-2023-44487
Original Bulletin:
https://www.ibm.com/support/pages/node/7077065
Comment: CVSS (Max): 7.5 CVE-2023-44487 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: NIST
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The following are listed in the CISA Known Exploited Vulnerabilities (KEV) Catalog:
CISA KEV CVE(s): CVE-2023-44487
CISA KEV URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
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Security Bulletin: IBM WebSphere Application Server Liberty, which is bundled
with IBM WebSphere Hybrid Edition, is vulnerable to denial of service due to
HTTP/2 Rapid Reset vulnerability (CVE-2023-44487)
Document Information
Document number : 7077065
Modified date : 15 November 2023
Product : IBM WebSphere Hybrid Edition
Component : -
Software version : 5.1
Operating system(s): Windows
AIX
Mac OS
z/OS
IBM i
HP-UX
Security Bulletin
Summary
IBM WebSphere Application Server Liberty, which is bundled with IBM WebSphere
Hybrid Edition, is vulnerable to a denial of service with the servlet-3.1,
servlet-4.0, servlet-5.0, or servlet-6.0 feature with the HTTP/2 protocol
enabled.
Vulnerability Details
Refer to the security bulletin(s) listed in the Remediation/Fixes section
Affected Products and Versions
+----------------------------------+----------------------------------------+
|Affected Product(s) and Version(s)|Affecting Product(s) and Version(s) |
+----------------------------------+----------------------------------------+
|IBM WebSphere Hybrid Edition |IBM WebSphere Application Server Liberty|
| | |
| o 5.1 | o 18.0.0.2-23.0.0.11 |
+----------------------------------+----------------------------------------+
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now by applying a
currently available interim fix or fix pack that contains the APAR PH57878 as
described in Security Bulletin: IBM WebSphere Application Server Liberty is
vulnerable to a denial of service (CVE-2023-44487)
Workarounds and Mitigations
None
Acknowledgement
Change History
15 Nov 2023: Initial Publication
*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. In addition to other efforts to
address potential vulnerabilities, IBM periodically updates the record of
components contained in our product offerings. As part of that effort, if IBM
identifies previously unidentified packages in a product/service inventory, we
address relevant vulnerabilities regardless of CVE date. Inclusion of an older
CVEID does not demonstrate that the referenced product has been used by IBM
since that date, nor that IBM was aware of a vulnerability as of that date. We
are making clients aware of relevant vulnerabilities as we become aware of
them. "Affected Products and Versions" referenced in IBM Security Bulletins are
intended to be only products and versions that are supported by IBM and have
not passed their end-of-support or warranty date. Thus, failure to reference
unsupported or extended-support products and versions in this Security Bulletin
does not constitute a determination by IBM that they are unaffected by the
vulnerability. Reference to one or more unsupported versions in this Security
Bulletin shall not create an obligation for IBM to provide fixes for any
unsupported or extended-support products or versions.
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