CVE-2021-40775
📋 TL;DR
This vulnerability in Adobe Prelude allows attackers to execute arbitrary code by tricking users into opening malicious SVG files. It affects users running Adobe Prelude version 10.1 or earlier. Successful exploitation requires user interaction through opening a specially crafted file.
💻 Affected Systems
- Adobe Prelude
📦 What is this software?
Prelude by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Complete 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 leading to malware installation, data exfiltration, or persistence mechanisms being established on the affected system.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially resulting in application crash rather than code execution.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and knowledge of memory corruption techniques. No public exploits have been reported.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.1.1 or later
Vendor Advisory: https://helpx.adobe.com/security/products/prelude/apsb21-96.html
Restart Required: Yes
Instructions:
1. Open Adobe Creative Cloud application. 2. Navigate to 'Apps' section. 3. Find Adobe Prelude and click 'Update'. 4. Alternatively, download the latest version from Adobe's website. 5. Install the update and restart the application.
🔧 Temporary Workarounds
Disable SVG file handling
allPrevent Prelude from processing SVG files by modifying file associations
Windows: assoc .svg=txtfile
macOS: defaults write com.apple.LaunchServices LSHandlers -array-add '{LSHandlerContentType=public.svg;LSHandlerRoleAll=com.apple.TextEdit;}'
Application sandboxing
macOSRun Adobe Prelude in restricted mode or sandboxed environment
macOS: sandbox-exec -n no-network -p '(version 1)(allow default)(deny network*)' /Applications/Adobe\ Prelude/Adobe\ Prelude.app/Contents/MacOS/Adobe\ Prelude
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized code
- Restrict user privileges to standard user accounts without administrative rights
🔍 How to Verify
Check if Vulnerable:
Check Adobe Prelude version in Help > About Adobe Prelude menuCheck Version:
Windows: wmic product where name="Adobe Prelude" get version
macOS: /Applications/Adobe\ Prelude/Adobe\ Prelude.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify version is 10.1.1 or higher in Help > About Adobe Prelude📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected child processes spawned from Adobe Prelude
- File access to SVG files followed by abnormal process behavior
Network Indicators:
- Outbound connections from Adobe Prelude process to unknown IPs post-file opening
- DNS requests to suspicious domains from Adobe Prelude process
SIEM Query:
process_name:"Adobe Prelude.exe" AND (event_id:1000 OR event_id:1001) OR process_name:"Adobe Prelude.exe" AND child_process_creation:true