CVE-2025-9567
📋 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 actions as authenticated users, redirect to malicious sites, or install malware through drive-by downloads.
Likely Case
Attackers will use phishing emails to trick users into clicking malicious links, leading to session hijacking, credential theft, or defacement of the application.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute JavaScript, limiting impact to error messages or benign payload display.
🎯 Exploit Status
Exploitation requires social engineering to trick users into clicking malicious URLs but doesn't require authentication to the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references; check vendor advisory for exact version
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10357-7de41-2.html
Restart Required: No
Instructions:
1. Contact Sunnet for the security patch. 2. Apply the patch to all eHRD instances. 3. Test the application functionality after patching.
🔧 Temporary Workarounds
Implement Web Application Firewall (WAF)
allDeploy a WAF with XSS protection rules to block malicious payloads before they reach the application.
Enable Content Security Policy (CSP)
allImplement CSP headers to restrict script execution sources and mitigate XSS impact.
🧯 If You Can't Patch
- Isolate the eHRD application behind a reverse proxy with strict input validation and XSS filtering.
- Implement user awareness training about phishing risks and suspicious links in emails.
🔍 How to Verify
Check if Vulnerable:
Test for XSS by injecting script payloads into URL parameters and observing if they execute in the browser.Check Version:
Check the eHRD application version through its admin interface or configuration files.Verify Fix Applied:
Retest XSS payloads after patching; they should be properly encoded and not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual long URLs with script tags or JavaScript code in query parameters
- Multiple failed login attempts following suspicious URL access
Network Indicators:
- HTTP requests containing <script>, javascript:, or other XSS payload patterns in URL parameters
SIEM Query:
source="web_server_logs" AND (url="*<script>*" OR url="*javascript:*" OR url="*onerror=*" OR url="*onload=*")