CVE-2024-36174
📋 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, defacement of web pages, or redirection to phishing sites.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
Exploitation requires the attacker to have content creation/modification privileges in AEM. The vulnerability is in form field handling.
🛠️ 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 guide. 3. Restart the AEM instance. 4. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement strict input validation and output encoding for all form fields
Implement server-side validation using AEM's XSS API: org.apache.sling.xss.XSSAPI
Content Security Policy
allImplement strict Content Security Policy headers to limit script execution
Add CSP headers via AEM dispatcher configuration or web server
🧯 If You Can't Patch
- Implement strict input validation and output encoding for all user-controllable form fields
- Apply Content Security Policy (CSP) headers to restrict script execution sources
- Limit user permissions to only necessary content creation/modification capabilities
- Monitor and audit form submissions for suspicious content
🔍 How to Verify
Check if Vulnerable:
Check AEM version via the welcome screen or system console. Versions 6.5.20 and earlier are vulnerable.Check Version:
Navigate to AEM welcome screen or check /system/console/status-productinfo endpointVerify Fix Applied:
Verify AEM version is 6.5.21 or later. Test form fields with XSS payloads to ensure they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual content modifications
- Form submissions containing script tags or JavaScript
- Multiple failed XSS attempts
Network Indicators:
- Unexpected script loads from external domains
- Suspicious POST requests to form endpoints
SIEM Query:
source="aem_logs" AND ("script" OR "javascript" OR "onload" OR "onerror") AND ("form" OR "field")