CVE-2021-43754
📋 TL;DR
Adobe Prelude versions 22.1.1 and earlier contain an out-of-bounds write vulnerability that allows attackers to execute arbitrary code by tricking users into opening malicious files. This affects all users running vulnerable versions of Adobe Prelude. Successful exploitation requires user interaction to open a specially crafted file.
💻 Affected Systems
- Adobe Prelude
📦 What is this software?
Prelude by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Local privilege escalation or malware installation on the affected workstation, compromising user data and system integrity.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially only crashing the application.
🎯 Exploit Status
Exploitation requires user interaction to open malicious files. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 22.1.2 or later
Vendor Advisory: https://helpx.adobe.com/security/products/prelude/apsb21-114.html
Restart Required: Yes
Instructions:
1. Open Adobe Creative Cloud application. 2. Navigate to 'Apps' tab. 3. Find Adobe Prelude and click 'Update'. 4. Alternatively, download latest version from Adobe website. 5. Restart system after installation.
🔧 Temporary Workarounds
Restrict file opening
allConfigure application to only open trusted files or disable automatic file opening
Application sandboxing
allRun Adobe Prelude in restricted environment or virtual machine
🧯 If You Can't Patch
- Restrict user privileges to standard user accounts (not administrator)
- Implement application whitelisting to prevent execution of unauthorized code
🔍 How to Verify
Check if Vulnerable:
Check Adobe Prelude version in Help > About Adobe Prelude. If version is 22.1.1 or earlier, system is vulnerable.Check Version:
On Windows: Check version in Control Panel > Programs. On macOS: Check in Applications folder or use 'mdls' command on application bundle.Verify Fix Applied:
Verify version is 22.1.2 or later in Help > About Adobe Prelude. Test opening various file types to ensure stability.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected child processes spawned from Adobe Prelude
Network Indicators:
- Unusual outbound connections from Adobe Prelude process
SIEM Query:
Process creation where parent process contains 'prelude' AND (process contains 'cmd' OR process contains 'powershell' OR process contains 'bash')