Security Bulletin: IBM HTTP Server is vulnerable to a denial of service (CVE-2023-26281)

Summary

IBM HTTP Server, which is used by IBM WebSphere Application Server, is vulnerable to a denial of service using a specially crafted URL. This has been addressed in the remediation section below.

Vulnerability Details

CVEID:CVE-2023-26281
**DESCRIPTION:**IBM HTTP Server used by IBM WebSphere Application Server could allow a remote user to cause a denial of service using a specially crafted URL.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/248296 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains APAR PH52754.

For IBM HTTP Server used by IBM WebSphere Application Server:

For V8.5.5.22 through 8.5.5.23:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH52754
--OR–
· Apply Fix Pack 8.5.5.24 or later (targeted availability 3Q2023).

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

Important Note

IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and
integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will
be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential
risk.

Workarounds and Mitigations

None