CVE-2023-0925
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to execute arbitrary code on webMethods OneData servers by exploiting insecure Java RMI deserialization. Attackers can send malicious serialized objects to the RMI registry port (2099) and RMI interface ports, leading to complete system compromise. Organizations running webMethods OneData version 10.11 with default configurations are affected.
💻 Affected Systems
- Software AG webMethods OneData
📦 What is this software?
Webmethods by Softwareag
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with SYSTEM/root privileges, enabling data theft, ransomware deployment, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to data exfiltration, credential harvesting, and installation of cryptocurrency miners or botnet malware.
If Mitigated
Limited impact if network segmentation, strict firewall rules, and proper authentication controls prevent access to RMI ports.
🎯 Exploit Status
Java RMI deserialization exploits are well-documented and tooling exists (ysoserial, etc.). The CVSS 9.8 score indicates trivial exploitation with high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 10.12 or later
Vendor Advisory: https://www.softwareag.com/en_corporate/platform/integration-apis/webmethods-integration.html
Restart Required: Yes
Instructions:
1. Download webMethods OneData version 10.12 or later from Software AG support portal. 2. Backup current configuration and data. 3. Stop all webMethods OneData services. 4. Apply the update following vendor documentation. 5. Restart services and verify functionality.
🔧 Temporary Workarounds
Block RMI Ports with Firewall
allPrevent external and internal access to Java RMI ports (2099 and dynamically assigned high ports)
# Windows: netsh advfirewall firewall add rule name="Block RMI Ports" dir=in action=block protocol=TCP localport=2099,49152-65535
# Linux: iptables -A INPUT -p tcp --dport 2099 -j DROP && iptables -A INPUT -p tcp --dport 49152:65535 -j DROP
Disable RMI Registry
allConfigure webMethods OneData to disable the Java RMI registry if not required
Modify Java startup parameters: -Djava.rmi.server.hostname=localhost -Dcom.sun.management.jmxremote.port=0 -Dcom.sun.management.jmxremote.ssl=true -Dcom.sun.management.jmxremote.authenticate=true
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems from untrusted networks
- Deploy intrusion prevention systems (IPS) with rules to detect and block Java RMI deserialization attacks
🔍 How to Verify
Check if Vulnerable:
Check if port 2099 is listening and accessible: nmap -p 2099 <target_ip> or telnet <target_ip> 2099. Also verify webMethods OneData version is 10.11.Check Version:
Check webMethods OneData installation directory for version files or consult administrative console. On Windows: reg query "HKLM\SOFTWARE\Software AG\webMethods OneData" /v VersionVerify Fix Applied:
Confirm version is 10.12 or later and port 2099 is either closed or properly secured with authentication. Test RMI access with a safe serialization payload.📡 Detection & Monitoring
Log Indicators:
- Java RMI registry access logs showing deserialization errors
- Unexpected Java process spawning or network connections from webMethods processes
- Security logs showing SYSTEM/root privilege escalation
Network Indicators:
- TCP connections to port 2099 followed by connections to high ports (49152-65535)
- Network traffic containing Java serialized object patterns
- Outbound connections from webMethods server to suspicious IPs
SIEM Query:
source="webmethods.log" AND ("RMI" OR "deserialization" OR "2099") OR destination_port=2099 AND protocol=TCP