CVE-2022-50787
📋 TL;DR
CVE-2022-50787 is an unauthenticated stored cross-site scripting vulnerability in SOUND4 IMPACT/FIRST/PULSE/Eco software versions 2.x. Attackers can inject malicious scripts via the username parameter, which executes in victim browsers without authentication. Organizations using affected SOUND4 products are vulnerable to session hijacking and client-side attacks.
💻 Affected Systems
- SOUND4 IMPACT
- SOUND4 FIRST
- SOUND4 PULSE
- SOUND4 Eco
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator credentials, take full control of the system, pivot to internal networks, and deploy ransomware or exfiltrate sensitive data.
Likely Case
Session hijacking leading to unauthorized access, data theft, or defacement of the application interface.
If Mitigated
Limited impact with proper input validation, output encoding, and web application firewalls blocking malicious payloads.
🎯 Exploit Status
Exploitation requires minimal technical skill - attackers can use publicly available proof-of-concept scripts. The stored XSS persists across sessions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified by vendor
Vendor Advisory: https://www.sound4.com/
Restart Required: No
Instructions:
1. Check vendor website for security updates 2. Apply any available patches 3. Validate fix by testing username parameter injection
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy WAF rules to block XSS payloads in username parameter
# Example ModSecurity rule: SecRule ARGS:username "@detectXSS" "id:1001,phase:2,deny,status:403"
Input Validation Filter
allImplement server-side filtering to sanitize username input
# Example PHP: $username = htmlspecialchars($_POST['username'], ENT_QUOTES, 'UTF-8');
🧯 If You Can't Patch
- Isolate affected systems behind network segmentation to limit attack surface
- Implement strict content security policy (CSP) headers to mitigate script execution
🔍 How to Verify
Check if Vulnerable:
Test by submitting a username with XSS payload like <script>alert('test')</script> and check if it persistsCheck Version:
Check application interface or configuration files for version informationVerify Fix Applied:
Attempt the same XSS payload and verify it's properly sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- Unusual username entries containing script tags or JavaScript code
- Multiple failed login attempts with malicious usernames
Network Indicators:
- HTTP requests with script tags in username parameter
- Unusual outbound connections from application server
SIEM Query:
source="web_logs" AND (username="*<script>*" OR username="*javascript:*")🔗 References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/247920
- https://packetstormsecurity.com/files/170258/SOUND4-IMPACT-FIRST-PULSE-Eco-2.x-Persistent-Cross-Site-Scripting.html
- https://www.sound4.com/
- https://www.vulncheck.com/advisories/sound-impactfirstpulseeco-x-unauthenticated-stored-cross-site-scripting
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5731.php
