CVE-2025-56520
📋 TL;DR
Dify v1.6.0 contains a Server-Side Request Forgery (SSRF) vulnerability in the RemoteFileUploadApi component that allows attackers to make unauthorized requests from the server to internal or external systems. This affects all Dify installations running version 1.6.0. Attackers can potentially access internal services that should not be exposed.
💻 Affected Systems
- Dify
📦 What is this software?
Dify by Dify
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, or pivot to other internal systems by making the vulnerable server proxy requests to internal network resources.
Likely Case
Attackers scan internal networks, access metadata services, or interact with internal APIs that shouldn't be exposed externally.
If Mitigated
Limited to scanning internal network ranges or accessing services with additional authentication requirements.
🎯 Exploit Status
Exploitation requires understanding of the RemoteFileUploadApi endpoint and ability to craft SSRF payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.6.1 or later
Vendor Advisory: https://github.com/langgenius/dify/issues/22532
Restart Required: No
Instructions:
1. Update Dify to version 1.6.1 or later. 2. Verify the update by checking the version. 3. Test the RemoteFileUploadApi functionality.
🔧 Temporary Workarounds
Disable RemoteFileUploadApi
allTemporarily disable the vulnerable component until patching is possible
Modify Dify configuration to disable remote file upload functionality
Network Segmentation
allRestrict outbound network access from Dify servers
Configure firewall rules to limit Dify server outbound connections
🧯 If You Can't Patch
- Implement strict network segmentation to limit Dify server outbound connections
- Deploy a web application firewall (WAF) with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Check if running Dify version 1.6.0 by examining the application version in the admin interface or configuration filesCheck Version:
Check Dify admin dashboard or review package.json/version files in installation directoryVerify Fix Applied:
Verify Dify version is 1.6.1 or later and test RemoteFileUploadApi with SSRF payloads📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from Dify server
- Requests to internal IP addresses or metadata services
- Failed file upload attempts with unusual URLs
Network Indicators:
- Dify server making unexpected outbound HTTP requests
- Requests to internal network ranges from Dify server
SIEM Query:
source="dify" AND (url CONTAINS "169.254.169.254" OR url CONTAINS "localhost" OR url CONTAINS "127.0.0.1" OR url CONTAINS "internal")