CVE-2024-35284
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute reflected cross-site scripting (XSS) attacks against users of Mitel MiContact Center Business's legacy chat component. Attackers can inject malicious scripts that execute in victims' browsers when they visit specially crafted URLs. Organizations running vulnerable versions of MiContact Center Business are affected.
💻 Affected Systems
- Mitel MiContact Center Business
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, credentials, or sensitive data from authenticated users, potentially leading to account takeover, data exfiltration, or further system compromise.
Likely Case
Attackers would typically use this to steal session cookies or credentials from users who click malicious links, enabling unauthorized access to the contact center system.
If Mitigated
With proper web application firewalls, input validation, and user education about suspicious links, impact is limited to unsuccessful exploitation attempts.
🎯 Exploit Status
Reflected XSS typically requires social engineering to trick users into clicking malicious links. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.0.0.5 and later
Vendor Advisory: https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-24-0012
Restart Required: Yes
Instructions:
1. Download patch from Mitel support portal. 2. Backup current configuration. 3. Apply patch following Mitel documentation. 4. Restart MiContact Center Business services. 5. Verify functionality.
🔧 Temporary Workarounds
Disable Legacy Chat Component
allTemporarily disable the vulnerable legacy chat component until patching can be completed.
Consult Mitel documentation for component-specific disable procedures
Implement WAF Rules
allConfigure web application firewall to block XSS payloads targeting the chat endpoint.
Add WAF rule: Block requests containing common XSS patterns to /chat/* endpoints
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution from untrusted sources
- Deploy network segmentation to isolate MiContact Center Business from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check if MiContact Center Business version is 10.0.0.4 or earlier and legacy chat component is enabled.Check Version:
Check version in MiContact Center Business administration interface or consult system documentation.Verify Fix Applied:
Verify system version is 10.0.0.5 or later and test chat functionality with XSS payloads that should be blocked.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to chat endpoints containing script tags or JavaScript code
- Unusual chat component errors
Network Indicators:
- HTTP requests with XSS payload patterns to /chat/* endpoints
- Suspicious redirects from chat URLs
SIEM Query:
source="web_logs" AND (url="*/chat/*" AND (content="<script>" OR content="javascript:" OR content="onerror=" OR content="onload="))