CVE-2024-52859
📋 TL;DR
Adobe Experience Manager versions 6.5.21 and earlier contain a stored Cross-Site Scripting (XSS) vulnerability where attackers can inject malicious JavaScript into form fields. When users visit pages containing the compromised fields, their browsers execute the malicious scripts, potentially leading to session hijacking or data theft. This affects all organizations running vulnerable Adobe Experience Manager instances.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain administrative access to the AEM instance, modify content, install backdoors, or pivot to internal networks.
Likely Case
Attackers inject malicious scripts to steal user session cookies, redirect users to phishing sites, or perform actions on behalf of authenticated users.
If Mitigated
With proper input validation and output encoding, the vulnerability would be prevented, though the underlying code flaw remains until patched.
🎯 Exploit Status
Exploitation requires the ability to submit data to vulnerable form fields, which typically requires some level of access (though possibly low-privileged). The XSS payload executes when users view the compromised content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.5.22 or later
Vendor Advisory: https://helpx.adobe.com/security/products/experience-manager/apsb24-69.html
Restart Required: Yes
Instructions:
1. Download Adobe Experience Manager 6.5.22 or later from Adobe's distribution portal. 2. Apply the service pack following Adobe's installation instructions. 3. Restart the AEM instance. 4. Verify the update was successful.
🔧 Temporary Workarounds
Implement Content Security Policy (CSP)
allAdd a Content Security Policy header to restrict script execution from untrusted sources
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to HTTP response headers
Input Validation Filter
allImplement server-side input validation to sanitize form field inputs
Configure AEM's XSS protection filters or implement custom servlet filters to sanitize user input
🧯 If You Can't Patch
- Implement strict input validation and output encoding for all user-controllable form fields
- Deploy a Web Application Firewall (WAF) with XSS protection rules enabled
🔍 How to Verify
Check if Vulnerable:
Check AEM version via the Welcome screen or system console. If version is 6.5.21 or earlier, the system is vulnerable.Check Version:
Access AEM Welcome screen at /libs/cq/core/content/welcome.html or check CRXDE Lite at /crx/deVerify Fix Applied:
After patching, verify the AEM version is 6.5.22 or later and test form fields with basic XSS payloads to ensure they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form submission endpoints
- Requests containing common XSS payload patterns in parameters
Network Indicators:
- HTTP requests with JavaScript payloads in form parameters
- Unexpected outbound connections from user browsers after visiting AEM pages
SIEM Query:
source="aem_access.log" AND (http_method="POST" AND (uri_path="*/j_security_check" OR uri_path="*/bin/*") AND (param="<script>" OR param="javascript:"))