CVE-2025-69206
📋 TL;DR
This CVE describes a Server-Side Request Forgery (SSRF) vulnerability in Hemmelig's webhook URL validation that allows authenticated users to bypass IP filtering using DNS rebinding or open redirect services. This enables attackers to make the server initiate HTTP requests to internal network resources. Only authenticated users of Hemmelig versions before 7.3.3 are affected.
💻 Affected Systems
- Hemmelig
📦 What is this software?
Hemmelig by Hemmelig
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access sensitive internal services, exfiltrate data from internal networks, or pivot to other systems within the organization's infrastructure.
Likely Case
Information disclosure from internal services, reconnaissance of internal network topology, or limited data exfiltration from accessible internal endpoints.
If Mitigated
Minimal impact if network segmentation prevents the server from accessing sensitive internal resources and proper authentication controls are in place.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of DNS rebinding or open redirect techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.3.3
Vendor Advisory: https://github.com/HemmeligOrg/Hemmelig.app/security/advisories/GHSA-vvxf-wj5w-6gj5
Restart Required: Yes
Instructions:
1. Update Hemmelig to version 7.3.3 or later. 2. Restart the Hemmelig service. 3. Verify the patch is applied by checking the version.
🔧 Temporary Workarounds
Disable Secret Requests webhook feature
allTemporarily disable the vulnerable webhook functionality until patching can be completed.
Configure Hemmelig to disable webhook functionality in Secret Requests feature
Network segmentation
allRestrict the Hemmelig server's network access to prevent reaching internal resources.
Configure firewall rules to block outbound HTTP/HTTPS from Hemmelig server to internal networks
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the Hemmelig server from sensitive internal resources
- Monitor for unusual outbound HTTP requests from the Hemmelig server to internal IP ranges
🔍 How to Verify
Check if Vulnerable:
Check if Hemmelig version is below 7.3.3 and webhook functionality is enabled in Secret Requests.Check Version:
Check Hemmelig application version in admin interface or configuration filesVerify Fix Applied:
Confirm Hemmelig version is 7.3.3 or higher and test webhook validation with internal IP addresses.📡 Detection & Monitoring
Log Indicators:
- Unusual webhook requests to internal IP addresses
- Failed webhook validation attempts
- HTTP requests from server to internal network ranges
Network Indicators:
- HTTP traffic from Hemmelig server to internal IP ranges
- DNS queries for potentially malicious domains
SIEM Query:
source="hemmelig" AND (dest_ip IN private_ranges OR url CONTAINS "internal" OR url CONTAINS "localhost")