CVE-2024-34141
📋 TL;DR
A stored Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager allows low-privileged attackers to inject malicious JavaScript into vulnerable form fields. When victims browse pages containing these fields, their browsers execute the attacker's scripts. This affects 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 low privileges could steal session data from other users, perform limited unauthorized actions, or deploy basic malware.
If Mitigated
With proper input validation and output encoding, the vulnerability would be prevented, though the underlying code flaw remains.
🎯 Exploit Status
Exploitation requires authenticated low-privileged access to vulnerable form fields.
🛠️ 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 official distribution. 2. Follow Adobe's upgrade documentation for your deployment type (on-premise or cloud). 3. Restart the AEM instance after applying the update.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement strict input validation and output encoding for all form fields to prevent XSS payloads from being stored and executed.
Content Security Policy (CSP)
allDeploy a strict Content Security Policy to mitigate the impact of successful XSS attacks by restricting script execution sources.
🧯 If You Can't Patch
- Restrict low-privileged user access to vulnerable form fields and components.
- Implement web application firewall (WAF) rules to block common XSS payload patterns.
🔍 How to Verify
Check if Vulnerable:
Check Adobe Experience Manager version via the AEM welcome screen or system console. If version is 6.5.20 or earlier, the system is vulnerable.Check Version:
Access AEM welcome page at http://[host]:[port]/welcome.html or check CRXDE Lite at /system/console/status-productinfoVerify Fix Applied:
After patching, verify the version is 6.5.21 or later and test form fields for XSS payload acceptance.📡 Detection & Monitoring
Log Indicators:
- Unusual form submissions with script tags or JavaScript code in field values
- Multiple failed login attempts followed by form submissions
Network Indicators:
- HTTP POST requests containing script tags or JavaScript in form parameters
- Unusual outbound connections from AEM server after form submissions
SIEM Query:
source="aem_access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")