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Hi, I'm Sharon, a product manager at Chaitin Tech. We build SafeLine, an open-source Web Application Firewall built for real-world threats. While SafeLine focuses on HTTP-layer protection, our emergency response center monitors and responds to RCE and authentication vulnerabilities across the stack to help developers stay safe.
On September 17, 2025, Yonyou Security Center disclosed a critical arbitrary file upload vulnerability affecting all versions of U8 Cloud ERP. The flaw resides in the IPFxxFileService module, which fails to properly validate file paths, allowing attackers to upload arbitrary files to web-accessible directories. This can ultimately lead to remote code execution (RCE) and full server compromise.
Vulnerability Overview
Root Cause
The issue is caused by insufficient path validation in IPFxxFileService. An attacker can craft malicious upload requests to drop files directly into directories that are accessible via the web server.
Impact
- Remote Code Execution (RCE): Attackers can run arbitrary system commands.
- Full Server Takeover: The vulnerable ERP server may be completely controlled.
- Data Breach & Business Risks: Sensitive information could be leaked, and business operations disrupted.
Risk Rating: High
Attack Vector: Remote, network-based
Authentication Required: None
User Interaction: None
Configuration: Default setup vulnerable
Exploit Maturity: No public PoC/Exploit yet
Fix Complexity: Low (official patch available)
Affected Versions
- All versions of Yonyou U8 Cloud
Mitigation & Fix
Patch Available: Yonyou has released a security patch. All users should update immediately.
👉 Official Patch Link-
Temporary Workarounds:
- Avoid exposing the ERP system directly to the internet.
Reproduction
Product Support & Detection
- Yuntu – Supports fingerprinting for this product and PoC detection.
- Dongjian – Will support custom PoC detection from September 18, 2025.
- Quanxi – Ruleset update for detection expected on September 18, 2025.
- Wufeng – Already supports product fingerprinting, PoC detection coming September 18, 2025.
Timeline
- 2025-09-17 – Yonyou Security Center released official security advisory.
- 2025-09-18 – Chaitin Security Emergency Response Center published additional details.
Key Takeaway
If your organization runs Yonyou U8 Cloud, patch immediately. The flaw is trivial to exploit once public PoCs surface, and attackers could gain full control of your ERP infrastructure.
Join the SafeLine Community
If you continue to experience issues, feel free to contact SafeLine support for further assistance.
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