CVE-2024-36218
📋 TL;DR
This stored Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager allows attackers to inject malicious JavaScript into vulnerable form fields. When users visit pages containing these compromised fields, their browsers execute the attacker's code. This affects Adobe Experience Manager versions 6.5.20 and earlier.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal user session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on victim systems.
Likely Case
Session hijacking, credential theft, or defacement of web pages through injected content.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
Exploitation requires access to vulnerable form fields, which typically requires some level of access to the AEM interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.5.21 or later
Vendor Advisory: https://helpx.adobe.com/security/products/experience-manager/apsb24-28.html
Restart Required: Yes
Instructions:
1. Download Adobe Experience Manager 6.5.21 or later from Adobe's distribution portal. 2. Apply the service pack following Adobe's installation instructions. 3. Restart all AEM instances. 4. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement strict input validation and proper output encoding for all form fields
Content Security Policy
allImplement Content Security Policy headers to restrict script execution
🧯 If You Can't Patch
- Implement strict input validation and output encoding for all user inputs
- Deploy Web Application Firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check AEM version via the Welcome screen or OSGi console. If version is 6.5.20 or earlier, the system is vulnerable.Check Version:
Check via AEM Welcome screen or use CRXDE Lite to examine /libs/cq/core/content/welcome.htmlVerify Fix Applied:
Verify AEM version is 6.5.21 or later. Test form fields for XSS by attempting to inject script tags and verifying they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form endpoints
- Requests containing script tags or JavaScript in form fields
- Error logs showing XSS filter bypass attempts
Network Indicators:
- HTTP requests with suspicious payloads in form parameters
- Outbound connections to unknown domains following form submissions
SIEM Query:
source="aem_logs" AND ("script" OR "javascript:" OR "onerror=" OR "onload=") AND method="POST"