CVE-2024-36143
📋 TL;DR
Adobe Experience Manager versions 6.5.20 and earlier contain a stored XSS vulnerability where attackers can inject malicious JavaScript into form fields. When users visit pages containing the compromised fields, their browsers execute the attacker's code. This affects all organizations running vulnerable AEM versions.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, perform actions as authenticated users, deface websites, or redirect users to malicious sites.
Likely Case
Attackers inject malicious scripts to steal user session data or credentials from authenticated users visiting compromised pages.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching user browsers.
🎯 Exploit Status
Requires attacker to have access to vulnerable form fields, which typically requires some level of access or social engineering.
🛠️ 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 AEM 6.5.21 or later from Adobe Distribution. 2. Apply the Service Pack following Adobe's upgrade documentation. 3. Restart AEM instances. 4. Verify successful upgrade.
🔧 Temporary Workarounds
Input Validation Filter
allImplement custom servlet filters to sanitize form field inputs before processing
Implement Java servlet filter with OWASP Java Encoder library for input sanitization
Content Security Policy
allImplement strict CSP headers to prevent script execution from untrusted sources
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to HTTP headers
🧯 If You Can't Patch
- Implement WAF rules to block XSS payloads in form submissions
- Disable or restrict access to vulnerable form fields until patching is possible
🔍 How to Verify
Check if Vulnerable:
Check AEM version via CRXDE Lite or OSGi console. If version is 6.5.20 or earlier, system is vulnerable.Check Version:
curl -u admin:password http://localhost:4502/system/console/status-productinfo | grep 'Adobe Experience Manager'Verify Fix Applied:
After patching, verify version is 6.5.21 or later and test form fields with XSS payloads to ensure they're sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual form submissions with script tags or JavaScript code
- Multiple failed XSS attempts in request logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in form parameters
- Unusual outbound connections from user browsers after form submissions
SIEM Query:
source="aem_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")