CVE-2024-41877
📋 TL;DR
Adobe Experience Manager versions 6.5.19 and earlier contain a stored Cross-Site Scripting (XSS) vulnerability where attackers can inject malicious scripts into form fields. When users browse pages containing these compromised fields, their browsers execute the malicious JavaScript. 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 session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems through drive-by downloads.
Likely Case
Session hijacking, credential theft, defacement of web pages, or data exfiltration from user browsers accessing the compromised pages.
If Mitigated
With proper input validation and output encoding, the vulnerability would be prevented, though the underlying code flaw remains until patched.
🎯 Exploit Status
Exploitation requires the ability to submit data to vulnerable form fields, which typically requires some level of access or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.5.20 or later
Vendor Advisory: https://helpx.adobe.com/security/products/experience-manager/apsb24-05.html
Restart Required: Yes
Instructions:
1. Download Adobe Experience Manager 6.5.20 or later from Adobe's official distribution. 2. Follow Adobe's upgrade documentation for your deployment type (on-premise or cloud). 3. Apply the update to all affected instances. 4. Restart the AEM service to complete the installation.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize user input in form fields before processing.
Configure AEM's XSS Protection API or implement custom servlet filters
Content Security Policy
allImplement Content Security Policy headers to restrict script execution sources.
Add 'Content-Security-Policy' header with appropriate directives
🧯 If You Can't Patch
- Restrict access to vulnerable form fields through authentication and authorization controls
- Implement web application firewall rules to block XSS payload patterns
🔍 How to Verify
Check if Vulnerable:
Check Adobe Experience Manager version via AEM Web Console (/system/console) or by examining the CRX package manager for installed versions.Check Version:
curl -k https://<aem-host>:<port>/system/console/status-productinfo 2>/dev/null | grep 'Adobe Experience Manager'Verify Fix Applied:
After patching, verify the version shows 6.5.20 or later and test form fields with XSS payloads to confirm they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form endpoints with script-like content
- Error logs showing XSS filter violations
Network Indicators:
- HTTP requests containing common XSS payload patterns in form data
SIEM Query:
source="aem_access.log" AND (uri_path="*/form/*" OR uri_path="*/content/*") AND (http_method="POST" OR http_method="PUT") AND (request_body MATCHES "<script>" OR request_body MATCHES "javascript:")