CVE-2025-12344
📋 TL;DR
This vulnerability in Yonyou U8 Cloud allows attackers to upload arbitrary files without authentication by manipulating request headers. It affects all versions up to 5.1sp and can be exploited remotely, potentially leading to system compromise.
💻 Affected Systems
- Yonyou U8 Cloud
⚠️ 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 takeover through remote code execution via malicious file upload, leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Unauthorized file upload leading to web shell installation, data exfiltration, or service disruption.
If Mitigated
Limited impact with proper network segmentation, WAF rules, and file upload restrictions in place.
🎯 Exploit Status
Exploit details are publicly available on GitHub. Attack requires manipulating ts/sign parameters in request headers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - vendor did not respond to disclosure
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to version after 5.1sp if available, or implement workarounds.
🔧 Temporary Workarounds
Block vulnerable endpoint
allBlock access to /service/NCloudGatewayServlet at network or application firewall level
# Example iptables rule: iptables -A INPUT -p tcp --dport [PORT] -m string --string "/service/NCloudGatewayServlet" --algo bm -j DROP
Implement WAF rules
allAdd rules to detect and block manipulation of ts/sign parameters in request headers
# Example ModSecurity rule: SecRule REQUEST_HEADERS:ts "@rx .*" "id:1001,phase:1,deny,msg:'CVE-2025-12344 exploit attempt'"
# Example ModSecurity rule: SecRule REQUEST_HEADERS:sign "@rx .*" "id:1002,phase:1,deny,msg:'CVE-2025-12344 exploit attempt'"
🧯 If You Can't Patch
- Isolate affected systems in separate network segments with strict firewall rules
- Implement application-level input validation for all file upload functionality
🔍 How to Verify
Check if Vulnerable:
Test if /service/NCloudGatewayServlet endpoint accepts manipulated ts/sign headers leading to file upload. Use disclosed exploit PoC with caution in test environment.Check Version:
Check Yonyou U8 Cloud version in administration interface or configuration files. Typically found in /WEB-INF/version.properties or similar.Verify Fix Applied:
Verify that manipulating ts/sign headers no longer allows unauthorized file uploads. Test with controlled payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /service/NCloudGatewayServlet
- File uploads with suspicious extensions (.jsp, .php, .asp) via NCloudGatewayServlet
- Requests with manipulated ts/sign headers
Network Indicators:
- Unusual traffic patterns to /service/NCloudGatewayServlet endpoint
- Outbound connections from server after file upload attempts
SIEM Query:
source="web_logs" AND uri="/service/NCloudGatewayServlet" AND (header_ts="*" OR header_sign="*")