CVE-2024-12756
📋 TL;DR
An HTML injection vulnerability in Avaya Spaces allows attackers to inject malicious HTML content into web pages, potentially leading to information disclosure or page content manipulation. This affects users of Avaya Spaces collaboration platform who view compromised content.
💻 Affected Systems
- Avaya Spaces
📦 What is this software?
Spaces by Avaya
⚠️ Risk & Real-World Impact
Worst Case
Attackers could inject malicious scripts to steal session cookies, credentials, or sensitive user data, potentially leading to account takeover and data breaches.
Likely Case
Attackers modify page content to display misleading information, phishing forms, or deface pages, potentially tricking users into revealing information.
If Mitigated
With proper input validation and output encoding, injected HTML would be rendered as plain text rather than executable code.
🎯 Exploit Status
Requires ability to inject HTML into vulnerable fields; may require some user interaction
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in advisory; refer to vendor documentation
Vendor Advisory: https://support.avaya.com/css/public/documents/101091836
Restart Required: No
Instructions:
1. Review Avaya advisory 101091836
2. Apply latest Avaya Spaces updates
3. Verify patch installation
4. Test functionality
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement strict input validation and output encoding for all user-controllable fields
🧯 If You Can't Patch
- Implement WAF rules to detect and block HTML injection patterns
- Restrict user permissions to minimize injection opportunities
🔍 How to Verify
Check if Vulnerable:
Test user-controllable fields for HTML injection by attempting to inject basic HTML tags and observing if they renderCheck Version:
Check Avaya Spaces version in admin console or via vendor documentationVerify Fix Applied:
Retest injection attempts after patching; HTML should be displayed as plain text, not rendered📡 Detection & Monitoring
Log Indicators:
- Unusual HTML/script patterns in user input fields
- Multiple failed injection attempts
Network Indicators:
- HTTP requests containing suspicious HTML/script payloads
SIEM Query:
source="avaya_spaces" AND (http_request:*<script* OR http_request:*javascript:* OR http_request:*onclick=*)