CVE-2025-3026
📋 TL;DR
This vulnerability in EJBCA Enterprise 8.0 allows attackers to manipulate HTTP Host headers to redirect clients to malicious servers. By exploiting this header injection flaw, attackers could intercept or manipulate client communications. Only EJBCA Enterprise 8.0 users are affected.
💻 Affected Systems
- EJBCA Enterprise
📦 What is this software?
Ejbca by Primekey
⚠️ Risk & Real-World Impact
Worst Case
Attackers redirect all client requests to malicious servers, intercepting sensitive certificate management operations and potentially stealing credentials or issuing fraudulent certificates.
Likely Case
Targeted redirection attacks against specific users to capture authentication credentials or manipulate certificate issuance requests.
If Mitigated
Limited impact with proper network segmentation and monitoring, though some client redirection attempts may still succeed.
🎯 Exploit Status
Exploitation requires modifying HTTP headers, which is straightforward with standard web testing tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-ejbca
Restart Required: No
Instructions:
1. Check vendor advisory for updates. 2. Upgrade to a patched version when available. 3. Apply workarounds immediately.
🔧 Temporary Workarounds
Host Header Validation
allConfigure web server or application firewall to validate and sanitize Host headers.
# Apache: Use mod_rewrite to validate Host header
# Nginx: Use $http_host validation in config
Reverse Proxy Configuration
allDeploy reverse proxy that strips or validates Host headers before reaching EJBCA.
# Example nginx config snippet:
proxy_set_header Host $host;
# Ensure only valid hosts are passed
🧯 If You Can't Patch
- Implement strict network segmentation to isolate EJBCA from untrusted networks.
- Deploy web application firewall with Host header injection protection rules.
🔍 How to Verify
Check if Vulnerable:
Test by sending HTTP requests with modified Host headers to EJBCA endpoints and checking if links reflect the injected host.Check Version:
Check EJBCA version via web interface or configuration files.Verify Fix Applied:
After applying workarounds, repeat Host header manipulation tests to confirm redirection no longer occurs.📡 Detection & Monitoring
Log Indicators:
- Unusual Host header values in web server logs
- Multiple failed redirect attempts
Network Indicators:
- HTTP requests with manipulated Host headers
- Unexpected external redirects from EJBCA
SIEM Query:
source="ejbca.log" AND (Host:*malicious* OR Host:*unexpected*)