CVE-2025-3125
📋 TL;DR
An arbitrary file upload vulnerability in WSO2 products allows authenticated admin users to upload malicious files to server locations they control, potentially leading to remote code execution. This affects multiple WSO2 products with the vulnerable CarbonAppUploader admin service endpoint. Only systems with admin users who could be compromised are at risk.
💻 Affected Systems
- WSO2 API Manager
- WSO2 Identity Server
- WSO2 Enterprise Integrator
- WSO2 Micro Integrator
- WSO2 Streaming Integrator
- WSO2 Micro Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise through remote code execution, allowing data theft, lateral movement, and persistent backdoor installation.
Likely Case
Privilege escalation leading to application takeover, data exfiltration, or deployment of web shells for ongoing access.
If Mitigated
Limited impact due to strong admin credential protection, network segmentation, and file upload restrictions.
🎯 Exploit Status
Exploitation requires admin credentials but is straightforward once obtained; file upload to controlled location bypasses validation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply security updates per WSO2 advisory WSO2-2025-3961
Vendor Advisory: https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2025/WSO2-2025-3961/
Restart Required: Yes
Instructions:
1. Review WSO2 advisory WSO2-2025-3961. 2. Download and apply the relevant security patch for your product and version. 3. Restart the WSO2 server. 4. Verify the fix by checking the version and testing upload functionality.
🔧 Temporary Workarounds
Restrict Admin Service Access
allDisable or restrict access to the CarbonAppUploader admin service endpoint via network controls or configuration.
Modify carbon.xml to restrict admin service access or use firewall rules to block unnecessary endpoints.
Strengthen Admin Credentials
allEnforce strong, unique passwords for admin accounts and enable multi-factor authentication if supported.
Change admin passwords using strong, complex credentials; implement account lockout policies.
🧯 If You Can't Patch
- Implement network segmentation to isolate WSO2 servers from critical systems.
- Monitor and audit admin account activity for suspicious login attempts or file uploads.
🔍 How to Verify
Check if Vulnerable:
Check if running affected WSO2 product versions and if CarbonAppUploader endpoint is accessible to admin users.Check Version:
Check product version via WSO2 management console or server logs.Verify Fix Applied:
Verify patch application by checking version against fixed releases in advisory and testing that malicious file uploads are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads via CarbonAppUploader endpoint
- Admin login from unexpected IPs
- Execution of suspicious files on server
Network Indicators:
- HTTP POST requests to /services/CarbonAppUploader with file uploads
- Outbound connections from server post-upload
SIEM Query:
source="wso2-logs" AND (uri_path="/services/CarbonAppUploader" OR event="file_upload")