CVE-2024-52857
📋 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 the compromised fields, their browsers execute the attacker's code. Organizations running Adobe Experience Manager versions 6.5.21 or earlier are affected.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack user sessions, deface websites, or redirect users to malicious sites, potentially leading to complete system compromise.
Likely Case
Attackers would typically steal session cookies or user credentials, enabling unauthorized access to the Experience Manager system and potentially other connected systems.
If Mitigated
With proper input validation and output encoding, the vulnerability would be prevented, though the vulnerable code would still exist in the system.
🎯 Exploit Status
Exploitation requires access to vulnerable form fields, which typically requires some level of user privileges.
🛠️ 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. Follow Adobe's upgrade documentation for your specific deployment type (AEM as a Cloud Service, AEM on-premise, or AMS). 3. Test the upgrade in a staging environment first. 4. Apply the upgrade to production systems during a maintenance window. 5. Restart all AEM instances after the upgrade.
🔧 Temporary Workarounds
Input Validation Filter
allImplement custom servlet filters to sanitize user input in form fields
Implement custom Java servlet filter with input validation logic
Content Security Policy
allImplement strict Content Security Policy headers to limit script execution
Add 'Content-Security-Policy' header with script-src directives
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Disable or restrict access to vulnerable form fields and components
🔍 How to Verify
Check if Vulnerable:
Check AEM version via OSGi console or CRXDE. If version is 6.5.21 or earlier, the system is vulnerable.Check Version:
curl -u admin:admin http://localhost:4502/system/console/status-productinfo.json | grep versionVerify Fix Applied:
After patching, verify the version is 6.5.22 or later and test form fields with XSS payloads to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form submission endpoints
- Requests containing script tags or JavaScript in form fields
- Multiple failed login attempts following form submissions
Network Indicators:
- HTTP requests with suspicious parameters containing script tags or JavaScript
- Outbound connections to unknown domains following form submissions
SIEM Query:
source="aem-access.log" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")