CVE-2023-21621
📋 TL;DR
This vulnerability in Adobe FrameMaker allows arbitrary code execution when a user opens a malicious file. Attackers can exploit improper input validation to run code with the victim's privileges. Users of FrameMaker 2020 Update 4 and earlier, and FrameMaker 2022 and earlier are affected.
💻 Affected Systems
- Adobe FrameMaker
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer in the context of the current user's privileges.
Likely Case
Malicious document leads to malware installation, data theft, or ransomware deployment when opened by a user.
If Mitigated
No impact if users don't open untrusted FrameMaker files and proper application whitelisting is enforced.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No authentication bypass needed as user already has file access.
🛠️ 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 latest update. 4. Restart FrameMaker after installation completes.
🔧 Temporary Workarounds
Block FrameMaker file extensions
allPrevent opening of FrameMaker files via email filters or endpoint controls
Run with reduced privileges
windowsConfigure FrameMaker to run with limited user privileges instead of administrator rights
🧯 If You Can't Patch
- Implement application control to block FrameMaker execution entirely
- Educate users to never open FrameMaker files from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check FrameMaker version via Help > About FrameMaker. If version is 2020 Update 4 or earlier, or 2022 or earlier, system is vulnerable.Check Version:
In FrameMaker: Help > About FrameMakerVerify Fix Applied:
Verify version is 2020 Update 5 or later, or 2022 Update 1 or later after applying patch.📡 Detection & Monitoring
Log Indicators:
- Unexpected FrameMaker process crashes
- FrameMaker spawning unusual child processes
Network Indicators:
- FrameMaker making unexpected outbound connections after opening files
SIEM Query:
process_name:"FrameMaker.exe" AND (event_id:1 OR parent_process:unusual)