CVE-2024-41842
📋 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 all 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 administrator session cookies, perform actions as authenticated users, deface websites, or redirect users to malicious sites.
Likely Case
Attackers with content authoring access could inject malicious scripts that affect other users viewing compromised pages, potentially stealing session data or performing limited unauthorized actions.
If Mitigated
With proper input validation and output encoding, the risk is reduced to minimal, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Exploitation requires authenticated access with content authoring permissions. The vulnerability is in form fields where user input is not properly sanitized.
🛠️ 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. Follow Adobe's upgrade documentation for your deployment type (AEM as a Cloud Service or on-premise). 3. Apply the service pack or cumulative fix pack. 4. Restart the AEM instance. 5. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation Filter
allImplement custom servlet filters to sanitize input in vulnerable form fields before processing.
Implement custom Java servlet filter with input validation logic for form submissions
Content Security Policy
allImplement strict Content Security Policy headers to limit script execution.
Add 'Content-Security-Policy: script-src 'self'' to HTTP response headers
🧯 If You Can't Patch
- Restrict content authoring permissions to trusted users only
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check AEM version via OSGi console (http://localhost:4502/system/console/bundles) or CRXDE Lite. If version is 6.5.20 or earlier, the system is vulnerable.Check Version:
curl -u admin:admin http://localhost:4502/system/console/bundles | grep 'Adobe Experience Manager'Verify Fix Applied:
After patching, verify version is 6.5.21 or later. Test form fields with basic XSS payloads like <script>alert('test')</script> to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual content modifications in form fields
- Suspicious script tags in content submissions
- Multiple failed XSS attempts in request logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in form parameters
- Unusual content authoring activity patterns
SIEM Query:
source="aem-access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")