CVE-2023-47145: IBM Db2 Privilege Escalation Vulnerability

CVE-2023-47145 Overview

CVE-2023-47145 is a local privilege escalation vulnerability affecting IBM Db2 for Windows, including Db2 Connect Server. The vulnerability exists in versions 10.5, 11.1, and 11.5, allowing a local user with low privileges to escalate their access to SYSTEM-level permissions by exploiting the MSI repair functionality. This vulnerability has been assigned IBM X-Force ID 270402.

Critical Impact

A local attacker can leverage the MSI repair mechanism to gain complete SYSTEM-level access on affected Windows systems, potentially leading to full system compromise, data exfiltration, and lateral movement within enterprise environments.

Affected Products

• IBM Db2 for Windows 10.5
• IBM Db2 for Windows 11.1
• IBM Db2 for Windows 11.5
• IBM Db2 Connect Server (all affected versions)

Discovery Timeline

• January 7, 2024 - CVE-2023-47145 published to NVD
• June 11, 2025 - Last updated in NVD database

Technical Details for CVE-2023-47145

Vulnerability Analysis

This privilege escalation vulnerability resides in the MSI (Microsoft Installer) repair functionality of IBM Db2 for Windows installations. The flaw allows authenticated local users with limited privileges to abuse the repair mechanism to execute code with elevated SYSTEM privileges.

The vulnerability is categorized under CWE-269 (Improper Privilege Management), indicating a fundamental flaw in how the application manages user privileges during the MSI repair process. When a user initiates a repair operation, the installer performs certain actions with elevated privileges that can be exploited to gain unauthorized system access.

The attack requires local access to the system and a valid low-privileged user account, making it particularly dangerous in enterprise environments where multiple users share database servers or workstations with Db2 installed.

Root Cause

The root cause of CVE-2023-47145 lies in improper privilege management within the MSI repair functionality. During the repair process, the Windows Installer service executes with SYSTEM privileges, and the IBM Db2 installer fails to properly validate or restrict certain operations that can be manipulated by a local user. This allows an attacker to hijack the repair process to execute arbitrary code with elevated privileges.

Attack Vector

The attack vector is local, requiring the attacker to have authenticated access to a Windows system where IBM Db2 is installed. The attacker can then invoke the MSI repair functionality through standard Windows mechanisms such as the Programs and Features control panel, the msiexec command-line utility, or by directly calling the repair function.

The exploitation does not require user interaction from administrators and can be performed entirely with low-privilege credentials. Once the repair process is initiated, the attacker can leverage the elevated context to plant malicious payloads or manipulate system components that are processed during the repair operation.

The vulnerability mechanism exploits the trust relationship between the Windows Installer service and the IBM Db2 MSI package. Technical details are available in the IBM X-Force Vulnerability #270402 advisory.

Detection Methods for CVE-2023-47145

Indicators of Compromise

• Unusual invocations of msiexec.exe with repair flags (/f, /fa, /fm) targeting IBM Db2 product codes
• Unexpected SYSTEM-level processes spawned during or after Db2 MSI repair operations
• Audit logs showing low-privileged users initiating software repair operations on Db2 installations
• Creation of suspicious files or registry modifications during MSI repair activity

Detection Strategies

• Monitor Windows Event Logs for MsiInstaller events (Event ID 1033, 1035) involving IBM Db2 product repairs
• Implement endpoint detection rules to alert on msiexec.exe repair operations targeting Db2 MSI packages
• Deploy behavioral analysis to detect privilege escalation patterns following MSI repair invocations
• Configure application whitelisting to restrict MSI repair operations to authorized administrators only

Monitoring Recommendations

• Enable verbose Windows Installer logging and centralize logs to SIEM for analysis
• Implement file integrity monitoring on critical Db2 installation directories
• Monitor for unexpected child processes spawned by the Windows Installer service during Db2-related operations
• Track user privilege changes and new service installations following any Db2 maintenance activities

How to Mitigate CVE-2023-47145

Immediate Actions Required

• Apply the security patches provided by IBM for affected Db2 versions immediately
• Restrict local access to systems running IBM Db2 to only authorized personnel
• Review and limit which users have permissions to run MSI repair operations
• Audit systems for signs of exploitation using the detection methods above

Patch Information

IBM has released security updates to address this vulnerability. Administrators should review the IBM Support Document #7105500 for detailed patch information and upgrade instructions. NetApp customers using Db2 in their environments should also consult the NetApp Security Advisory NTAP-20240307-0003 for additional guidance.

Organizations should prioritize patching based on the exposure of their Db2 installations. Systems accessible by multiple local users or in shared environments should be patched first.

Workarounds

• Restrict MSI repair functionality through Group Policy by limiting access to Windows Installer repair features for standard users
• Implement application control policies to prevent unauthorized execution of msiexec.exe with repair parameters
• Reduce the attack surface by removing local user accounts from systems where Db2 is installed when feasible
• Consider network segmentation to isolate database servers from general-purpose workstations

Applying administrative access controls through Windows security policies can help limit the ability of low-privileged users to invoke MSI repair operations. Organizations should consult their security teams to implement appropriate access restrictions while maintaining necessary administrative capabilities.