Security Bulletin: IBM HTTP Server is vulnerable to a denial of service due to libexpat (CVE-2023-52425)

Summary

IBM HTTP Server, which is used by IBM WebSphere Application Server, is vulnerable to a denial of service due to libexpat using a specially crafted request.

Vulnerability Details

**CVEID:**CVE-2023-52425 DESCRIPTION: libexpat is vulnerable to a denial of service, caused by improper system resource allocation. By sending a specially crafted request using an overly large token, a remote attacker could exploit this vulnerability to cause a denial of service.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/281438 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

This vulnerability affects the following version and release of IBM HTTP Server (powered by Apache) component in all editions of IBM WebSphere Application Server and bundling products.

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains APAR PH59697.

For IBM HTTP Server used by IBM WebSphere Application Server:

For V9.0.0.0 through 9.0.5.18:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH59697
--OR–
· Apply Fix Pack 9.0.5.19 or later (targeted availability 1Q2024).

For V8.5.0.0 through 8.5.5.25:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH59697
--OR–
· Apply Fix Pack 8.5.5.26 or later (targeted availability 3Q2024).

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