CVE-2024-56346
📋 TL;DR
This critical vulnerability in IBM AIX's nimesis NIM master service allows remote attackers to execute arbitrary commands on affected systems due to improper process controls. Systems running IBM AIX 7.2 or 7.3 with the vulnerable NIM service are at risk of complete compromise.
💻 Affected Systems
- IBM AIX
📦 What is this software?
Aix by Ibm
Aix by Ibm
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root privileges, enabling data theft, ransomware deployment, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to privilege escalation, credential harvesting, and installation of malicious payloads on vulnerable AIX systems.
If Mitigated
Limited impact if service is not exposed to untrusted networks and proper network segmentation is implemented.
🎯 Exploit Status
CVSS 10.0 indicates trivial exploitation with no authentication required. Remote attackers can trigger the vulnerability without user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply the security fix from IBM's advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/7186621
Restart Required: Yes
Instructions:
1. Download the appropriate fix from IBM Fix Central. 2. Apply the fix using smitty or installp command. 3. Restart affected services or reboot system as required.
🔧 Temporary Workarounds
Disable NIM Master Service
aixTemporarily disable the vulnerable nimesis NIM master service if not required
stopsrc -s nimesis
chssys -s nimesis -d
Network Access Control
allRestrict network access to NIM service ports using firewall rules
iptables -A INPUT -p tcp --dport [NIM_PORT] -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate AIX systems from untrusted networks
- Deploy host-based intrusion detection and monitor for suspicious process execution
🔍 How to Verify
Check if Vulnerable:
Check if AIX version is 7.2 or 7.3 and nimesis service is running: lssrc -s nimesisCheck Version:
oslevel -sVerify Fix Applied:
Verify fix installation: lslpp -L | grep -i nimesis and check service status📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from nimesis service
- Failed authentication attempts to NIM service
- Suspicious network connections to NIM ports
Network Indicators:
- Unexpected traffic to NIM service ports (typically 1058/tcp)
- Anomalous outbound connections from AIX systems
SIEM Query:
source="aix_logs" AND (process="nimesis" OR port=1058) AND (event_type="process_execution" OR event_type="network_connection")