CVE-2021-28571
📋 TL;DR
CVE-2021-28571 is a command injection vulnerability in Adobe After Effects that allows arbitrary code execution when chained with JavaScript debugging tools. Attackers can exploit this by tricking users into opening malicious files, potentially compromising the victim's system. Users of Adobe After Effects version 18.1 and earlier are affected.
💻 Affected Systems
- Adobe After Effects
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer, data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Local privilege escalation leading to data exfiltration, installation of persistent malware, or credential harvesting from the compromised user account.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially only affecting user-specific files and settings.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and chaining with JavaScript debugging tools, making it moderately complex.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 18.2 and later
Vendor Advisory: https://helpx.adobe.com/ee/security/products/after_effects/apsb21-33.html
Restart Required: Yes
Instructions:
1. Open Adobe Creative Cloud application 2. Navigate to 'Apps' section 3. Find Adobe After Effects 4. Click 'Update' if available 5. Restart computer after installation
🔧 Temporary Workarounds
Disable JavaScript debugging tools
allRemove or disable JavaScript development/debugging tools that could be chained with this vulnerability
Restrict file execution
allConfigure system to prevent execution of untrusted After Effects project files
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized processes
- Use endpoint detection and response (EDR) tools to monitor for suspicious command execution patterns
🔍 How to Verify
Check if Vulnerable:
Check Adobe After Effects version in Help > About After Effects menuCheck Version:
On Windows: wmic product where name='Adobe After Effects' get version
On macOS: /Applications/Adobe\ After\ Effects\ */Adobe\ After\ Effects.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify version is 18.2 or higher in Help > About After Effects menu📡 Detection & Monitoring
Log Indicators:
- Unusual process spawning from After Effects
- Suspicious command execution patterns
- JavaScript debugging tool activity
Network Indicators:
- Unexpected outbound connections from After Effects process
- Command and control traffic following file opening
SIEM Query:
process_name:"AfterFX.exe" AND (process_spawn:* OR cmdline:*powershell* OR cmdline:*cmd.exe*)