CVE-2023-45168
📋 TL;DR
This vulnerability allows a non-privileged local user on IBM AIX and VIOS systems to exploit the invscout command to execute arbitrary commands with elevated privileges. It affects IBM AIX 7.2, 7.3, and VIOS 3.1 systems. This is a local privilege escalation vulnerability that could lead to full system compromise.
💻 Affected Systems
- IBM AIX
- IBM VIOS
📦 What is this software?
Aix by Ibm
Aix by Ibm
⚠️ Risk & Real-World Impact
Worst Case
A local attacker gains root privileges and takes complete control of the system, potentially accessing sensitive data, installing persistent backdoors, or pivoting to other systems.
Likely Case
A local user with standard privileges escalates to root and performs unauthorized actions on the affected system.
If Mitigated
With proper access controls and monitoring, exploitation would be detected and contained before significant damage occurs.
🎯 Exploit Status
Exploitation requires local user access but appears to be straightforward based on the vulnerability description. No public exploit code has been identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply the security fix from IBM's advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/7086090
Restart Required: Yes
Instructions:
1. Review IBM advisory at https://www.ibm.com/support/pages/node/7086090
2. Download and apply the appropriate fix for your AIX/VIOS version
3. Reboot the system as required
4. Verify the fix is properly installed
🔧 Temporary Workarounds
Remove invscout execute permissions
linuxTemporarily remove execute permissions from the invscout command to prevent exploitation
chmod -x /usr/sbin/invscout
Restrict invscout access
linuxRemove invscout from non-privileged users' PATH or restrict access via permissions
chmod 750 /usr/sbin/invscout
chown root:system /usr/sbin/invscout
🧯 If You Can't Patch
- Implement strict access controls to limit local user accounts on affected systems
- Monitor for suspicious invscout command execution and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check if invscout exists and is executable: ls -la /usr/sbin/invscoutCheck Version:
lslpp -L | grep invscoutVerify Fix Applied:
Check the version of invscout and verify it matches the patched version from IBM's advisory📡 Detection & Monitoring
Log Indicators:
- Unusual invscout command execution by non-privileged users
- Sudden privilege escalation events
- Suspicious command execution following invscout
Network Indicators:
- None - this is a local exploit
SIEM Query:
Search for invscout execution events followed by privilege changes or suspicious command execution