CVE-2021-28586
📋 TL;DR
CVE-2021-28586 is an out-of-bounds write vulnerability in Adobe After Effects that could allow arbitrary code execution when a user opens a malicious file. This affects After Effects 18.0 and earlier versions, putting users who open untrusted project files at risk.
💻 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 user's system and potentially pivoting to other systems.
Likely Case
Local privilege escalation leading to data theft, ransomware deployment, or persistence mechanisms installation.
If Mitigated
Limited impact with proper user training and file validation controls preventing malicious file execution.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code was available at disclosure time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: After Effects 18.1 and later
Vendor Advisory: https://helpx.adobe.com/security/products/after_effects/apsb21-33.html
Restart Required: Yes
Instructions:
1. Open Adobe Creative Cloud application. 2. Navigate to 'Apps' section. 3. Find After Effects and click 'Update'. 4. Follow prompts to install version 18.1 or later. 5. Restart computer after installation.
🔧 Temporary Workarounds
Restrict file opening
allConfigure After Effects to only open trusted files from known sources
Application sandboxing
allRun After Effects in a sandboxed environment to limit potential damage
🧯 If You Can't Patch
- Implement strict file validation policies to prevent opening untrusted After Effects project files
- Use application whitelisting to restrict After Effects execution to trusted environments only
🔍 How to Verify
Check if Vulnerable:
Check After Effects version: Open After Effects, go to Help > About After Effects. If version is 18.0 or earlier, system is vulnerable.Check 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 After Effects version is 18.1 or later in Help > About After Effects.📡 Detection & Monitoring
Log Indicators:
- Unexpected After Effects crashes
- Suspicious file opening events in application logs
- Unusual process spawning from After Effects
Network Indicators:
- Outbound connections from After Effects to unknown IPs
- DNS requests for suspicious domains after file opening
SIEM Query:
source="*after_effects*" AND (event_type="crash" OR file_path="*.aep" OR process_name="AfterFX.exe")