CVE-2023-44336
📋 TL;DR
This CVE describes a use-after-free vulnerability in Adobe Acrobat Reader that could allow arbitrary code execution when a user opens a malicious PDF file. Attackers could exploit this to run code with the victim's user privileges. All users running affected versions of Adobe Acrobat Reader are at risk.
💻 Affected Systems
- Adobe Acrobat Reader DC
- Adobe Acrobat Reader
📦 What is this software?
Acrobat by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer and user privileges, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malware installation leading to data exfiltration, credential theft, or system disruption for individual users who open malicious PDF files.
If Mitigated
Limited impact with proper security controls like application sandboxing, least privilege user accounts, and network segmentation preventing lateral movement.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public proof-of-concept has been disclosed as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Acrobat Reader DC 23.006.20380 or later, Acrobat Reader 20.005.30539 or later
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb23-54.html
Restart Required: Yes
Instructions:
1. Open Adobe Acrobat Reader. 2. Go to Help > Check for Updates. 3. Follow prompts to install available updates. 4. Restart the application when prompted.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allDisabling JavaScript can prevent exploitation of many PDF-based vulnerabilities
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allEnable Protected View for files from potentially unsafe locations
Edit > Preferences > Security (Enhanced) > Enable Protected View for all files from potentially unsafe locations
🧯 If You Can't Patch
- Implement application whitelisting to block unauthorized PDF readers
- Use network segmentation to isolate systems running vulnerable versions
🔍 How to Verify
Check if Vulnerable:
Check Adobe Acrobat Reader version via Help > About Adobe Acrobat Reader DCCheck Version:
Windows: wmic product where name='Adobe Acrobat Reader DC' get version
macOS: /Applications/Adobe\ Acrobat\ Reader\ DC.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify version is 23.006.20380 or later for DC, or 20.005.30539 or later for Acrobat Reader📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from AcroRd32.exe or Acrobat.exe
- Multiple failed PDF file openings
- Unexpected network connections from Adobe Reader processes
Network Indicators:
- Outbound connections to suspicious domains from systems running Adobe Reader
- Unusual PDF file downloads followed by process execution
SIEM Query:
source='*windows*' AND (process_name='AcroRd32.exe' OR process_name='Acrobat.exe') AND (parent_process!='explorer.exe' OR command_line CONTAINS 'malicious.pdf')