IBM Db2 Denial-of-Service Vulnerability via Crafted Queries

A denial-of-service vulnerability has been identified in IBM Db2 versions 11.5.0 through 11.5.9 and 12.1.0 through 12.1.4 for Linux, UNIX, and Windows, including Db2 Connect Server. This vulnerability allows an authenticated user to disrupt service by exploiting improper handling of special elements in data query logic, particularly with queries that involve multiple subqueries.

Impact

Exploitation of this vulnerability leads to a denial-of-service condition, causing the database server to become unresponsive or unavailable.

Remediation

Users can upgrade to the special build containing the interim fix for this issue. For Db2 version 11.5, this special build is available through Fix Central. For Db2 version 12.1, the special build can also be obtained from Fix Central. Specific build numbers and download links are provided in the IBM Security Bulletin.