CVE-2025-8775
📋 TL;DR
This critical vulnerability in Qiyuesuo Electronic Signature Platform allows remote attackers to upload arbitrary files without restrictions via the /api/code/upload endpoint. This affects all versions up to 4.34 of the platform, potentially enabling code execution or system compromise. Organizations using vulnerable versions are at immediate risk.
💻 Affected Systems
- Qiyuesuo Electronic Signature Platform
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system takeover, data theft, ransomware deployment, or lateral movement within the network.
Likely Case
File upload leading to web shell deployment, data exfiltration, or service disruption.
If Mitigated
Upload attempts blocked at network perimeter or detected by security controls before exploitation.
🎯 Exploit Status
Exploit details are publicly available on GitHub, making this easily exploitable by attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
Upgrade to version 4.35 or later when available. Monitor vendor communications for official patch.
🔧 Temporary Workarounds
Block /api/code/upload endpoint
allRestrict access to the vulnerable endpoint using web application firewall or network controls.
WAF rule: Block requests to */api/code/upload*
Implement file upload validation
allAdd server-side validation for file types, extensions, and content.
🧯 If You Can't Patch
- Isolate the Qiyuesuo system in a restricted network segment
- Implement strict network access controls and monitor for suspicious upload attempts
🔍 How to Verify
Check if Vulnerable:
Check if version is ≤4.34 in admin panel or via version API endpoint.Check Version:
Check admin interface or system configuration for version information.Verify Fix Applied:
Test file upload to /api/code/upload endpoint - should be rejected or properly validated.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /api/code/upload
- Large or suspicious files in upload directories
- Web shell deployment attempts
Network Indicators:
- POST requests to /api/code/upload with executable files
- Unusual outbound connections from the Qiyuesuo server
SIEM Query:
source="qiyuesuo" AND (url="/api/code/upload" OR file_upload=true)