CVE-2024-52842
📋 TL;DR
Adobe Experience Manager versions 6.5.21 and earlier contain a stored Cross-Site Scripting vulnerability where attackers can inject malicious JavaScript into form fields. When users visit pages containing these compromised fields, the scripts execute in their browsers. This affects organizations using vulnerable Adobe Experience Manager instances for content management.
💻 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, potentially leading to full system compromise if combined with other vulnerabilities.
Likely Case
Attackers inject malicious scripts to steal user session cookies or credentials, potentially gaining unauthorized access to the content management system.
If Mitigated
With proper input validation and output encoding, the vulnerability would be prevented, and impact would be limited to unsuccessful injection attempts.
🎯 Exploit Status
Exploitation requires the attacker to have access to create or modify content in vulnerable form fields, typically requiring some level of authenticated access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Adobe Experience Manager 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 official distribution channels. 2. Backup your current AEM instance and all custom configurations. 3. Apply the update following Adobe's official upgrade procedures. 4. Restart the AEM service. 5. Verify the update was successful by checking the version.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side input validation and output encoding for all form fields to prevent XSS payloads from being stored and executed.
Content Security Policy
allImplement a strict Content Security Policy header to restrict script execution sources and prevent inline script execution.
🧯 If You Can't Patch
- Implement web application firewall rules to detect and block XSS payloads in form submissions
- Restrict user permissions to minimize who can create or modify content in vulnerable form fields
🔍 How to Verify
Check if Vulnerable:
Check your Adobe Experience Manager version via the AEM welcome screen or by examining the crx-quickstart folder version file. If version is 6.5.21 or earlier, you are vulnerable.Check Version:
Check the version.txt file in the crx-quickstart folder or access the AEM welcome screen at /system/console/status-productinfoVerify Fix Applied:
After patching, verify the version shows 6.5.22 or later and test form fields with basic XSS payloads to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual content creation/modification patterns in form fields
- JavaScript payloads in form submission logs
- Multiple failed login attempts followed by content modifications
Network Indicators:
- HTTP requests containing JavaScript payloads in form parameters
- Unusual outbound connections from user browsers after visiting specific pages
SIEM Query:
source="aem_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=") AND (event_type="form_submission" OR event_type="content_modification")