CVE-2023-27558
📋 TL;DR
This vulnerability allows local attackers to escalate privileges on IBM Db2 for Windows systems by exploiting unquoted service paths. Attackers can place malicious executables in service paths to execute code with higher privileges. Affects IBM Db2 versions 10.5, 11.1, and 11.5 on Windows systems.
💻 Affected Systems
- IBM Db2
📦 What is this software?
Db2 by Ibm
Db2 by Ibm
Db2 by Ibm
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM/administrator privileges, enabling installation of persistent malware, data theft, and lateral movement.
Likely Case
Local privilege escalation allowing attackers to gain administrative control over the Db2 database server and potentially the host system.
If Mitigated
Limited impact with proper access controls, monitoring, and service hardening in place.
🎯 Exploit Status
Exploitation requires local access to the system. Unquoted service path vulnerabilities are well-understood and easily exploitable by attackers with local access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fixes from IBM security advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/7010571
Restart Required: Yes
Instructions:
1. Review IBM advisory for specific patch versions. 2. Apply IBM-provided fixes for affected Db2 versions. 3. Restart affected Db2 services. 4. Verify service paths are properly quoted.
🔧 Temporary Workarounds
Quote Service Paths
windowsManually add quotes around service executable paths in Windows Registry
sc config "ServiceName" binPath= ""C:\Program Files\IBM\SQLLIB\BIN\db2syscs.exe""
Restart the service after modification
Restrict Write Permissions
windowsRemove write permissions from directories in the service path
icacls "C:\Program Files" /deny "Users":(OI)(CI)W
icacls "C:\Program Files (x86)" /deny "Users":(OI)(CI)W
🧯 If You Can't Patch
- Implement strict access controls to limit local user access to Db2 servers
- Monitor for suspicious file creation in system directories and service execution
🔍 How to Verify
Check if Vulnerable:
Check Windows services for Db2-related services with unquoted paths using: sc qc "ServiceName" | findstr BINARY_PATH_NAMECheck Version:
db2level command or check Windows Registry: HKEY_LOCAL_MACHINE\SOFTWARE\IBM\DB2\InstalledCopiesVerify Fix Applied:
Verify service paths are quoted: sc qc "ServiceName" | findstr BINARY_PATH_NAME should show quoted paths📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs: Service Control Manager events (7036, 7040) showing service path modifications
- Security logs: Unauthorized file creation in system directories
- Application logs: Unexpected service restarts or failures
Network Indicators:
- N/A - Local privilege escalation only
SIEM Query:
EventID=4688 AND (NewProcessName="*\temp\*" OR NewProcessName="*\program files\*") AND ParentProcessName="services.exe"🔗 References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/249194
- https://security.netapp.com/advisory/ntap-20230818-0017/
- https://www.ibm.com/support/pages/node/7010571
- https://exchange.xforce.ibmcloud.com/vulnerabilities/249194
- https://security.netapp.com/advisory/ntap-20230818-0017/
- https://www.ibm.com/support/pages/node/7010571
