CVE-2024-28213
📋 TL;DR
nGrinder versions before 3.5.9 contain a Java deserialization vulnerability that allows unauthenticated remote attackers to execute arbitrary code by sending malicious serialized objects. This affects all nGrinder deployments using vulnerable versions, potentially compromising the entire system.
💻 Affected Systems
- nGrinder
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with full system compromise, allowing attackers to install malware, exfiltrate data, or pivot to other systems.
Likely Case
Remote code execution leading to service disruption, data theft, or ransomware deployment.
If Mitigated
Attack blocked at network perimeter or by authentication requirements, limiting impact to denial of service attempts.
🎯 Exploit Status
Java deserialization vulnerabilities are well-understood with many existing exploit chains available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.5.9
Vendor Advisory: https://cve.naver.com/detail/cve-2024-28213.html
Restart Required: Yes
Instructions:
1. Download nGrinder 3.5.9 or later from official repository. 2. Stop the nGrinder service. 3. Replace the existing installation with the patched version. 4. Restart the nGrinder service.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to nGrinder web interface to trusted IP addresses only.
iptables -A INPUT -p tcp --dport 8080 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP
Reverse Proxy with Authentication
allPlace nGrinder behind a reverse proxy that requires authentication before reaching the vulnerable endpoint.
🧯 If You Can't Patch
- Isolate nGrinder instance in a separate network segment with strict egress filtering
- Implement application-level firewall rules to block serialized object payloads
🔍 How to Verify
Check if Vulnerable:
Check nGrinder version via web interface or configuration files. If version is below 3.5.9, system is vulnerable.Check Version:
Check nGrinder web interface or examine version.txt in installation directory.Verify Fix Applied:
Confirm nGrinder version is 3.5.9 or higher and test that serialized object payloads are rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual Java deserialization errors
- Unexpected process creation from nGrinder
- Large serialized object payloads in requests
Network Indicators:
- HTTP POST requests with serialized Java objects to nGrinder endpoints
- Unusual outbound connections from nGrinder server
SIEM Query:
source="ngrinder.log" AND ("Serialization" OR "Deserialization" OR "java.io.ObjectInputStream")