CVE-2023-44359
📋 TL;DR
Adobe Acrobat Reader versions 23.006.20360 and earlier, and 20.005.30524 and earlier, contain a use-after-free vulnerability that could allow arbitrary code execution when a user opens a malicious PDF file. This affects all users running vulnerable versions of Adobe Acrobat Reader on any operating system. Successful exploitation requires user interaction to open a specially crafted file.
💻 Affected Systems
- Adobe Acrobat Reader DC
- Adobe Acrobat Reader
📦 What is this software?
Acrobat 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 within the network.
Likely Case
Malicious code execution leading to malware installation, credential theft, or unauthorized access to local files and resources.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially containing the exploit to the application context.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code was available at disclosure time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 23.006.20380 (Continuous Track), 20.005.30539 (Classic Track)
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
allPrevents JavaScript execution which may be used in exploitation chains
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View for untrusted files
allForces untrusted PDFs to open in sandboxed Protected View mode
File > Preferences > Security (Enhanced) > Check 'Enable Protected View at startup'
🧯 If You Can't Patch
- Implement application control to block execution of vulnerable Adobe Reader versions
- Use network segmentation to restrict PDF file downloads from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check Adobe Reader version in 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 higher (Continuous) or 20.005.30539 or higher (Classic)📡 Detection & Monitoring
Log Indicators:
- Adobe Reader crash logs with memory access violations
- Windows Event Logs showing unexpected process creation from AcroRd32.exe
Network Indicators:
- Unexpected outbound connections from Adobe Reader process
- PDF file downloads from suspicious sources
SIEM Query:
process_name:"AcroRd32.exe" AND (event_id:1000 OR event_id:1001) AND exception_code:0xc0000005