CVE-2023-21619
📋 TL;DR
CVE-2023-21619 is an out-of-bounds write vulnerability in Adobe FrameMaker that could allow arbitrary code execution when a user opens a malicious file. This affects FrameMaker 2020 Update 4 and earlier, and FrameMaker 2022 and earlier versions. Attackers could exploit this to run code with the privileges of the current user.
💻 Affected Systems
- Adobe FrameMaker
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the logged-in user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive documents and system resources, with potential for malware installation.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially preventing code execution or limiting damage scope.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code available at time of advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FrameMaker 2020 Update 5, FrameMaker 2022 Update 1
Vendor Advisory: https://helpx.adobe.com/security/products/framemaker/apsb23-06.html
Restart Required: Yes
Instructions:
1. Open Adobe FrameMaker. 2. Go to Help > Check for Updates. 3. Follow prompts to install FrameMaker 2020 Update 5 or FrameMaker 2022 Update 1. 4. Restart FrameMaker after installation completes.
🔧 Temporary Workarounds
Disable FrameMaker file associations
allPrevent FrameMaker from automatically opening potentially malicious files
Windows: Use Default Programs settings to change .fm/.book file associations
macOS: Use Finder > Get Info to change file associations
Application sandboxing
allRun FrameMaker in restricted environment to limit potential damage
Windows: Use AppLocker or Windows Sandbox
macOS: Use sandbox-exec or create restricted user account
🧯 If You Can't Patch
- Implement strict email filtering to block malicious attachments
- Educate users about risks of opening untrusted FrameMaker files
🔍 How to Verify
Check if Vulnerable:
Check FrameMaker version in Help > About FrameMaker. If version is earlier than 2020 Update 5 or 2022 Update 1, system is vulnerable.Check Version:
Windows: framemaker.exe --version (if available) or check in Help > About. macOS: Check FrameMaker > About FrameMaker.Verify Fix Applied:
Verify version shows 2020 Update 5 or 2022 Update 1 in Help > About FrameMaker.📡 Detection & Monitoring
Log Indicators:
- Unexpected FrameMaker crashes
- Suspicious file opens from untrusted sources
- Process creation from FrameMaker with unusual parameters
Network Indicators:
- Outbound connections from FrameMaker process to unknown IPs
- DNS requests for suspicious domains after file open
SIEM Query:
Process:FrameMaker.exe AND (EventID:1000 OR ParentProcess:explorer.exe) AND CommandLine:*.fm