CVE-2025-3218
📋 TL;DR
IBM i Netserver has authentication and authorization validation flaws that could allow attackers to brute force credentials or bypass access controls. This affects IBM i operating systems versions 7.2 through 7.6. Attackers could gain unauthorized access to the server.
💻 Affected Systems
- IBM i Netserver
📦 What is this software?
I by Ibm
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⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative access, data theft, and lateral movement within the network.
Likely Case
Unauthorized access to sensitive files and services on the IBM i server, potentially leading to data exfiltration.
If Mitigated
Limited impact with proper network segmentation, strong authentication policies, and monitoring in place.
🎯 Exploit Status
Exploitation requires network access to Netserver ports and involves authentication attacks. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply IBM i PTF Group SF99738 Level 30 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/7232750
Restart Required: Yes
Instructions:
1. Check current PTF level with DSPPTF
2. Apply PTF Group SF99738 Level 30 or later via GO PTF
3. Restart the IBM i system to activate fixes
🔧 Temporary Workarounds
Disable IBM i Netserver
ibmiTemporarily disable the vulnerable service if not required
ENDTCPSVR SERVER(*NETSVR)
Restrict Network Access
allLimit Netserver access to trusted networks only
Use IBM i firewall rules or network ACLs to restrict access to ports 445, 139, 138, 137
🧯 If You Can't Patch
- Implement network segmentation to isolate IBM i systems
- Enable detailed logging and monitoring for authentication attempts on Netserver
🔍 How to Verify
Check if Vulnerable:
Check IBM i version with WRKACTJOB and verify Netserver is active with NETSTAT *CNNCheck Version:
DSPPTFVerify Fix Applied:
Verify PTF Group SF99738 Level 30 or later is installed with DSPPTF📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts in QHST log
- Unusual file access patterns via Netserver
Network Indicators:
- Brute force attempts on ports 445/139
- Unexpected SMB traffic to IBM i systems
SIEM Query:
source="QHST" AND (event="authentication failure" OR event="access denied") AND dest_port IN (445, 139)