CVE-2023-44338
📋 TL;DR
Adobe Acrobat Reader versions 23.006.20360 and earlier, and 20.005.30524 and earlier, contain an out-of-bounds read vulnerability when parsing malicious PDF files. An attacker can exploit this to execute arbitrary code with the privileges of the current user. Exploitation requires user interaction through opening a 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 logged-in user, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Limited code execution in user context leading to data exfiltration, credential theft, or installation of additional malware.
If Mitigated
Application crash or denial of service if memory protections prevent successful code execution.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 23.006.20380 for continuous track, 20.005.30539 for 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
allDisabling JavaScript reduces attack surface as many PDF exploits rely on JavaScript execution.
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allEnable Protected View for files from potentially untrusted sources.
Edit > Preferences > Security (Enhanced) > Enable Protected View at startup
🧯 If You Can't Patch
- Restrict user permissions to limit impact of successful exploitation
- Implement application whitelisting to prevent execution of unauthorized binaries
🔍 How to Verify
Check if Vulnerable:
Check Adobe Acrobat Reader version via Help > About Adobe Acrobat Reader DCCheck Version:
On Windows: wmic product where name="Adobe Acrobat Reader DC" get versionVerify Fix Applied:
Verify version is 23.006.20380 or higher (continuous) or 20.005.30539 or higher (classic)📡 Detection & Monitoring
Log Indicators:
- Application crashes of acrobat.exe or AcroRd32.exe
- Unusual process creation from Adobe Reader
Network Indicators:
- Outbound connections from Adobe Reader process to suspicious domains
SIEM Query:
process_name:acrobat.exe AND (event_id:1000 OR event_id:1001) OR process_parent_name:acrobat.exe AND process_name:cmd.exe