Security Bulletin
Summary
IBM WebSphere Application Server Liberty 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
CVEID: CVE-2023-44487
DESCRIPTION: Multiple vendors are vulnerable to a denial of service, caused by a Rapid Reset flaw in the HTTP/2 protocol. By sending numerous HTTP/2 requests and RST_STREAM frames over multiple streams, a remote attacker could consume excessive server side resources.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/268044 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 | 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. 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. To determine if the HTTP/2 protocol is enabled with Liberty Servlet features see HTTP/2 Support for Liberty.
For IBM WebSphere Application Server Liberty 18.0.0.2 - 23.0.0.11 using the servlet-3.1, servlet-4.0, servlet-5.0, or servlet-6.0 feature(s) with the HTTP/2 protocol enabled:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH57878
--OR--
· Apply Liberty Fix Pack 23.0.0.12 or later (targeted availability 4Q2023).
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
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.
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.
Document Location
Worldwide
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Document Information
Modified date:
15 November 2023
UID
ibm17076252