CVE-2025-33109: IBM i Privilege Escalation Vulnerability

CVE-2025-33109 Overview

CVE-2025-33109 is a privilege escalation vulnerability affecting IBM i operating system versions 7.2 through 7.6. The vulnerability stems from an invalid database authority check that allows attackers to execute database procedures or functions without having the required permissions. This flaw can also be exploited to cause denial of service conditions for certain database actions.

Critical Impact

Attackers with low-privileged network access can escalate privileges to execute unauthorized database operations and potentially cause service disruptions across IBM i systems.

Affected Products

• IBM i 7.2
• IBM i 7.3
• IBM i 7.4
• IBM i 7.5
• IBM i 7.6

Discovery Timeline

• 2025-07-24 - CVE-2025-33109 published to NVD
• 2025-08-11 - Last updated in NVD database

Technical Details for CVE-2025-33109

Vulnerability Analysis

This vulnerability falls under CWE-250 (Execution with Unnecessary Privileges), where the IBM i database system fails to properly validate user authority before allowing execution of database procedures and functions. The flaw exists in the authority checking mechanism that should verify a user has appropriate permissions before granting access to database operations.

When a user attempts to execute a database procedure or function, the system's authorization logic contains a defect that bypasses certain permission checks. This allows authenticated users with minimal privileges to invoke database procedures and functions that should be restricted to higher-privileged accounts. The vulnerability can be exploited remotely over the network, requiring only low-level authentication to the IBM i system.

Root Cause

The root cause is an invalid database authority check within the IBM i operating system. The authorization validation logic fails to properly verify all required permissions before allowing execution of database procedures and functions. This improper access control allows users to exceed their intended privilege level when interacting with the database subsystem.

Attack Vector

The vulnerability is exploitable over the network by authenticated users with low privileges. An attacker with basic network access to an IBM i system can craft requests to execute database procedures or functions without possessing the normally required database authorities. The attack does not require user interaction and affects the confidentiality, integrity, and availability of the system.

The exploitation involves calling database procedures or functions through standard database interfaces while the flawed authorization check incorrectly grants access. Additionally, the vulnerability can be leveraged to trigger denial of service conditions by disrupting normal database operations.

Detection Methods for CVE-2025-33109

Indicators of Compromise

• Unusual database procedure or function executions by users who should not have access
• Unexpected errors or failures in database authorization logs
• Anomalous database activity patterns from low-privileged user accounts
• Service disruptions affecting database operations without clear operational cause

Detection Strategies

• Monitor IBM i audit journals for database procedure executions by unauthorized users
• Review authority failures and unexpected permission grants in system logs
• Implement alerting for database operations performed by users without documented access requirements
• Analyze database activity patterns to identify privilege escalation attempts

Monitoring Recommendations

• Enable detailed auditing on IBM i systems for database procedure and function calls
• Configure alerts for database authority violations and anomalies
• Regularly review user access levels and compare against actual database activity
• Monitor for denial of service indicators affecting database subsystems

How to Mitigate CVE-2025-33109

Immediate Actions Required

• Apply the latest security patches from IBM for all affected IBM i versions (7.2, 7.3, 7.4, 7.5, 7.6)
• Review and restrict database procedure and function access to only required users
• Audit current database authority assignments and remove unnecessary privileges
• Implement network segmentation to limit access to IBM i systems from untrusted networks

Patch Information

IBM has released security updates to address this vulnerability. Detailed patch information and download links are available in the IBM Security Advisory. Organizations should prioritize patching due to the network-exploitable nature of this privilege escalation vulnerability.

Workarounds

• Restrict network access to IBM i database interfaces to trusted hosts only
• Implement strict least-privilege policies for database user accounts
• Enable enhanced auditing to detect exploitation attempts before patches can be applied
• Consider disabling or restricting access to non-essential database procedures and functions until patching is complete

# Review current database authorities (example command structure)
# Consult IBM documentation for specific commands on your IBM i version
# DSPOBJAUT OBJ(library/procedure) OBJTYPE(*PGM)
# Review system audit journal entries for authorization events