CVE-2023-43449
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary code on HummerRisk systems via a crafted request to the LicenseService component. It affects all organizations running vulnerable versions of HummerRisk. Attackers with valid credentials can achieve remote code execution.
💻 Affected Systems
- HummerRisk
📦 What is this software?
Hummerrisk by Hummerrisk
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to data theft, lateral movement, ransomware deployment, or complete environment takeover.
Likely Case
Attackers with authenticated access execute malicious code to steal sensitive data, install backdoors, or disrupt operations.
If Mitigated
Limited impact due to network segmentation, strict access controls, and monitoring preventing successful exploitation.
🎯 Exploit Status
Exploitation requires authenticated access but appears straightforward based on the CWE-94 (Code Injection) classification.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after v1.4.1
Vendor Advisory: https://github.com/HummerRisk/HummerRisk/issues/446
Restart Required: Yes
Instructions:
1. Upgrade HummerRisk to version 1.4.2 or later. 2. Restart all HummerRisk services. 3. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict access to the LicenseService endpoint to only trusted IP addresses.
Use firewall rules to block external access to /service/LicenseService
Authentication Hardening
allImplement multi-factor authentication and strict access controls to limit authenticated users.
🧯 If You Can't Patch
- Isolate HummerRisk systems in a segmented network with strict egress filtering.
- Implement application-level WAF rules to block suspicious requests to LicenseService endpoints.
🔍 How to Verify
Check if Vulnerable:
Check HummerRisk version via web interface or configuration files. If version is between 1.10 and 1.4.1 inclusive, system is vulnerable.Check Version:
Check HummerRisk web interface or configuration files for version information.Verify Fix Applied:
Confirm version is 1.4.2 or later and test that LicenseService requests no longer accept arbitrary code execution payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to /service/LicenseService
- Suspicious command execution in system logs
- Authentication logs showing unexpected user access
Network Indicators:
- HTTP POST requests to LicenseService with unusual payloads
- Outbound connections from HummerRisk to unexpected destinations
SIEM Query:
source="hummerrisk" AND (uri_path="/service/LicenseService" AND (payload_contains="exec" OR payload_contains="system" OR payload_contains="Runtime.getRuntime"))