CVE-2023-45166
📋 TL;DR
A local privilege escalation vulnerability in IBM AIX and VIOS allows non-privileged local users to exploit the piodmgrsu command to gain elevated privileges. This affects IBM AIX 7.2, 7.3, and VIOS 3.1 systems. Attackers can leverage this to obtain root-level access on vulnerable systems.
💻 Affected Systems
- IBM AIX
- IBM VIOS
📦 What is this software?
Aix by Ibm
Aix by Ibm
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root access, allowing attackers to install persistent backdoors, exfiltrate sensitive data, or pivot to other systems.
Likely Case
Local attackers gain root privileges, enabling them to bypass security controls, access restricted data, and modify system configurations.
If Mitigated
Limited impact if proper access controls and monitoring are in place, though privilege escalation still poses significant risk.
🎯 Exploit Status
Requires local user access but appears to be straightforward exploitation based on the CVSS score and description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply the latest security updates from IBM
Vendor Advisory: https://www.ibm.com/support/pages/node/7095022
Restart Required: Yes
Instructions:
1. Check current AIX/VIOS version. 2. Download and apply the appropriate security update from IBM Fix Central. 3. Reboot the system to ensure patches are fully applied.
🔧 Temporary Workarounds
Restrict piodmgrsu command access
linuxRemove execute permissions from piodmgrsu for non-privileged users
chmod 750 /usr/sbin/piodmgrsu
Implement strict access controls
allUse role-based access control to limit who can execute privileged commands
🧯 If You Can't Patch
- Implement strict user access controls and monitor for suspicious privilege escalation attempts
- Isolate affected systems from critical network segments and implement additional monitoring
🔍 How to Verify
Check if Vulnerable:
Check if piodmgrsu command exists and is accessible to non-root users: ls -la /usr/sbin/piodmgrsuCheck Version:
oslevel -sVerify Fix Applied:
Verify the security update has been applied using oslevel -s command and check piodmgrsu permissions📡 Detection & Monitoring
Log Indicators:
- Unusual piodmgrsu command execution by non-privileged users
- Sudden privilege escalation events
- Failed sudo/su attempts followed by successful piodmgrsu execution
Network Indicators:
- None - this is a local exploit
SIEM Query:
search 'piodmgrsu' AND (user!=root OR uid!=0)