CVE-2021-28608
📋 TL;DR
CVE-2021-28608 is a heap-based buffer overflow vulnerability in Adobe After Effects that allows arbitrary code execution when a malicious file is opened. Attackers can exploit this to run code with the victim's user privileges. Users of Adobe After Effects versions 18.2 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, or lateral movement within the network.
Likely Case
Local privilege escalation leading to malware installation, data exfiltration, or persistence mechanisms being established on the compromised system.
If Mitigated
Limited impact due to user awareness training preventing malicious file execution, with potential application crash but no code execution.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious file. No public exploit code was available at disclosure time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 18.2.1 and later
Vendor Advisory: https://helpx.adobe.com/security/products/after_effects/apsb21-49.html
Restart Required: Yes
Instructions:
1. Open Adobe After Effects. 2. Go to Help > Updates. 3. Install available updates to version 18.2.1 or later. 4. Restart the application.
🔧 Temporary Workarounds
Restrict file execution
allConfigure application control policies to restrict execution of After Effects files from untrusted sources.
User awareness training
allTrain users to only open After Effects files from trusted sources and verify file integrity.
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unapproved After Effects files.
- Use network segmentation to isolate systems running vulnerable versions from critical assets.
🔍 How to Verify
Check if Vulnerable:
Check Adobe After Effects version in Help > About After Effects. If version is 18.2 or earlier, the system is vulnerable.Check Version:
Not applicable - check through application interfaceVerify Fix Applied:
Verify version is 18.2.1 or later in Help > About After Effects.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unusual file access patterns for .aep files
- Process creation from After Effects with suspicious command lines
Network Indicators:
- Outbound connections from After Effects process to suspicious IPs
- DNS queries for known malicious domains from affected systems
SIEM Query:
Process:name='AfterFX.exe' AND (EventID=1000 OR EventID=1001) AND Description CONTAINS 'ACCESS_VIOLATION'