CVE-2025-9569
📋 TL;DR
This is a reflected cross-site scripting (XSS) vulnerability in Sunnet's eHRD software that allows unauthenticated attackers to execute arbitrary JavaScript in users' browsers through phishing attacks. Organizations using vulnerable versions of Sunnet eHRD are affected, particularly those with internet-facing deployments.
💻 Affected Systems
- Sunnet eHRD
📦 What is this software?
Ehrd Ctms by Sun.net
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform account takeover, redirect users to malicious sites, or perform actions on behalf of authenticated users.
Likely Case
Attackers use phishing emails to trick users into clicking malicious links, leading to session hijacking or credential theft.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute malicious scripts.
🎯 Exploit Status
Exploitation requires social engineering to trick users into clicking malicious URLs
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10357-7de41-2.html
Restart Required: No
Instructions:
1. Contact Sunnet for security patches. 2. Apply patches to all eHRD instances. 3. Test in non-production environment first. 4. Deploy to production systems.
🔧 Temporary Workarounds
Implement Web Application Firewall (WAF)
allDeploy a WAF with XSS protection rules to block malicious requests
Enable Content Security Policy (CSP)
allImplement CSP headers to restrict script execution sources
🧯 If You Can't Patch
- Isolate the eHRD system behind a reverse proxy with strict input validation
- Implement network segmentation and restrict access to only necessary users
🔍 How to Verify
Check if Vulnerable:
Test for XSS by injecting script payloads into URL parameters and observing if they executeCheck Version:
Check eHRD version through web interface or configuration filesVerify Fix Applied:
Retest XSS payloads after patching to confirm they are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual long URL parameters containing script tags or JavaScript code
- Multiple failed login attempts from same IP
Network Indicators:
- HTTP requests with suspicious parameters containing <script> tags or JavaScript functions
SIEM Query:
source="web_logs" AND (url="*<script>*" OR url="*javascript:*" OR url="*onerror=*" OR url="*onload=*")