CVE-2020-24445
📋 TL;DR
This stored Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager allows attackers to inject malicious JavaScript into vulnerable form fields. When victims browse pages containing these compromised fields, their browsers execute the attacker's scripts. This affects AEM Cloud Service and AEM versions 6.5.6.0 and below.
💻 Affected Systems
- Adobe Experience Manager (AEM)
📦 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 typically steal session cookies or authentication tokens to impersonate users, perform unauthorized actions, or steal sensitive data from user sessions.
If Mitigated
With proper input validation and output encoding, the vulnerability is prevented, though legacy systems without patches remain at risk.
🎯 Exploit Status
XSS vulnerabilities are commonly exploited, though specific exploit details for this CVE aren't publicly documented. Attackers need access to vulnerable form fields.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: AEM 6.5.7.0 and later
Vendor Advisory: https://helpx.adobe.com/security/products/experience-manager/apsb20-72.html
Restart Required: Yes
Instructions:
1. Download the latest AEM service pack from Adobe's distribution portal. 2. Install the service pack following Adobe's installation guide. 3. Restart the AEM instance. 4. Verify the installation was successful.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize all user inputs before processing.
Configure AEM's XSS protection filter in the OSGi console
Content Security Policy
allImplement Content Security Policy headers to restrict script execution.
Add 'Content-Security-Policy' header to web server configuration
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Disable or restrict access to vulnerable form fields in AEM
🔍 How to Verify
Check if Vulnerable:
Check AEM version via the welcome screen or OSGi console. If version is 6.5.6.0 or below, the system is vulnerable.Check Version:
Navigate to /system/console/bundles in AEM or check the welcome screenVerify Fix Applied:
After patching, verify the version is 6.5.7.0 or higher and test form fields for XSS by attempting to inject basic script payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form endpoints with script tags
- Multiple failed XSS attempts in access logs
Network Indicators:
- HTTP requests containing script injection patterns
- Unexpected JavaScript execution in user sessions
SIEM Query:
source="aem_access.log" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")