CVE-2025-36365 is an authorization bypass vulnerability identified in IBM Db2 for Linux, UNIX, and Windows, specifically affecting versions 11.5.0 through 11.5.9 and 12.1.0 through 12.1.3. The flaw occurs under a particular configuration involving cataloged remote storage aliases, where an authenticated user can manipulate a user-controlled key to bypass authorization checks. This vulnerability is classified under CWE-639, which pertains to authorization bypass through user-controlled keys or tokens. The attack vector is network-based, requiring the attacker to have low-level privileges on the system but no additional user interaction. The vulnerability allows unauthorized execution of commands, potentially leading to unauthorized access to sensitive data or modification of database contents, impacting confidentiality and integrity. The CVSS v3.1 base score is 6.8, reflecting medium severity due to the high impact on confidentiality and integrity, but with high attack complexity and no impact on availability. No known exploits have been reported in the wild, but the vulnerability poses a significant risk in environments where Db2 is used with cataloged remote storage aliases configured. The vulnerability highlights the importance of secure configuration management and access control in database environments.

The primary impact of CVE-2025-36365 is unauthorized command execution by authenticated users with low privileges, leading to potential unauthorized access to sensitive data and unauthorized modification of database contents. This compromises the confidentiality and integrity of the data managed by IBM Db2 instances. Although availability is not directly affected, the breach of data confidentiality and integrity can have severe consequences for organizations, including data leaks, compliance violations, and loss of trust. Organizations relying on Db2 for critical business operations, especially those using cataloged remote storage aliases, face increased risk of insider threats or lateral movement by attackers who have gained low-level access. The medium severity score reflects the balance between the high impact on data security and the relatively high attack complexity and requirement for authenticated access. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as threat actors may develop exploits over time.

To mitigate CVE-2025-36365, organizations should: 1) Review and audit configurations involving cataloged remote storage aliases in IBM Db2 to ensure they do not allow user-controlled keys that can bypass authorization. 2) Apply any available patches or updates from IBM promptly once released, as no patch links are currently provided. 3) Implement strict access controls limiting which authenticated users can configure or access remote storage aliases. 4) Monitor database logs and user activities for unusual command executions or access patterns that could indicate exploitation attempts. 5) Employ network segmentation and least privilege principles to reduce the attack surface and limit the potential for lateral movement. 6) Conduct regular security assessments and penetration testing focused on authorization mechanisms within Db2 environments. 7) Educate database administrators and security teams about this vulnerability and the importance of secure configuration management. These measures go beyond generic advice by focusing on the specific configuration vectors and operational practices relevant to this vulnerability.