Security Bulletin: IBM HTTP Server is vulnerable to information disclosure due to IBM GSKit (CVE-2023-32342)

Summary

IBM HTTP Server used by IBM WebSphere Application Server is vulnerable to information disclosure due to IBM GSKit which is used for SSL connections. This has been addressed in the remediation section.

Vulnerability Details

CVEID:CVE-2023-32342
**DESCRIPTION:**IBM GSKit could allow a remote attacker to obtain sensitive information, caused by a timing-based side channel in the RSA Decryption implementation. By sending an overly large number of trial messages for decryption, an attacker could exploit this vulnerability to obtain sensitive information.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/255828 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)

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 PH52546.

For IBM HTTP Server used by IBM WebSphere Application Server:

For V9.0.0.0 through 9.0.5.15:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH52546
--OR–
· Apply Fix Pack 9.0.5.16 or later (targeted availability 2Q2023).

For V8.5.0.0 through 8.5.5.23:
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH52546
--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