CVE-2025-11900
📋 TL;DR
CVE-2025-11900 is an unauthenticated remote OS command injection vulnerability in HGiga's iSherlock software. Attackers can execute arbitrary commands on affected servers with full system privileges. All organizations using vulnerable iSherlock versions are affected.
💻 Affected Systems
- HGiga iSherlock
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data theft, ransomware deployment, lateral movement across networks, and persistent backdoor installation.
Likely Case
Initial foothold for attackers to deploy malware, steal sensitive data, or use compromised systems for further attacks.
If Mitigated
Limited impact due to network segmentation, proper input validation, and restricted service accounts.
🎯 Exploit Status
OS command injection vulnerabilities typically have simple exploitation patterns; weaponization is likely given the high CVSS score and unauthenticated nature.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references; check vendor advisory for specific patched version
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10441-00aaf-2.html
Restart Required: Yes
Instructions:
1. Contact HGiga support for patch details. 2. Download the latest patched version. 3. Backup current configuration. 4. Apply patch following vendor instructions. 5. Restart iSherlock services. 6. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to iSherlock management interface
iptables -A INPUT -p tcp --dport [iSherlock-port] -s [trusted-ips] -j ACCEPT
iptables -A INPUT -p tcp --dport [iSherlock-port] -j DROP
Web Application Firewall
allDeploy WAF with command injection rules to block exploitation attempts
🧯 If You Can't Patch
- Isolate iSherlock instances in separate network segments with strict firewall rules
- Implement strict input validation and sanitization at the application layer
🔍 How to Verify
Check if Vulnerable:
Check iSherlock version against vendor advisory; test with controlled command injection payloads in non-production environmentCheck Version:
Check iSherlock web interface or configuration files for version informationVerify Fix Applied:
Verify patched version is installed and test that command injection attempts are properly rejected📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Suspicious process creation from iSherlock service account
- Multiple failed authentication attempts followed by successful access
Network Indicators:
- Unusual outbound connections from iSherlock server
- Traffic patterns suggesting command-and-control communication
- Unexpected port scanning from iSherlock host
SIEM Query:
source="iSherlock" AND (command="cmd.exe" OR command="/bin/sh" OR command="powershell")