CVE-2024-52840
📋 TL;DR
This DOM-based XSS vulnerability in Adobe Experience Manager allows attackers to inject malicious scripts that execute in victims' browsers when they visit manipulated URLs or input malicious data. It affects users of Adobe Experience Manager versions 6.5.21 and earlier. Attackers can potentially steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full control of victim's browser session, steals sensitive data, performs unauthorized actions as the user, and potentially pivots to internal systems.
Likely Case
Session hijacking, credential theft, or defacement of web pages through script injection.
If Mitigated
Limited impact due to proper input validation, output encoding, and Content Security Policy implementation.
🎯 Exploit Status
Requires user interaction (victim must click malicious link or input data). DOM-based XSS requires specific conditions to trigger.
🛠️ 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 official distribution. 2. Follow Adobe's upgrade documentation for your deployment type (AEM as a Cloud Service or on-premise). 3. Apply the update to all affected instances. 4. Restart AEM services.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd strict CSP headers to prevent script execution from untrusted sources.
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to web server configuration
Input Validation Filter
allImplement server-side validation for all user inputs and URL parameters.
Configure AEM filters to sanitize user inputs before processing
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) with XSS protection rules
- Disable or restrict access to vulnerable components if possible
🔍 How to Verify
Check if Vulnerable:
Check AEM version via AEM Web Console (/system/console) or by examining the AEM installation directory.Check Version:
curl -k https://<aem-host>:<port>/system/console/status-productinfo 2>/dev/null | grep 'Adobe Experience Manager'Verify Fix Applied:
Verify version is 6.5.22 or later and test vulnerable endpoints with XSS payloads that should be blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual URL parameters with script tags or JavaScript code
- Multiple failed XSS attempts in access logs
Network Indicators:
- HTTP requests containing suspicious script patterns in parameters
- Unexpected redirects to external domains
SIEM Query:
source="aem_access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")