CVE-2020-9612
📋 TL;DR
This CVE describes a heap overflow vulnerability in Adobe Acrobat and Reader that could allow attackers to execute arbitrary code on affected systems. Users running vulnerable versions of Adobe Acrobat or Reader are at risk when opening malicious PDF files. The vulnerability affects multiple versions across different release tracks.
💻 Affected Systems
- Adobe Acrobat DC
- Adobe Acrobat Reader DC
- Adobe Acrobat 2017
- Adobe Acrobat Reader 2017
- Adobe Acrobat 2015
- Adobe Acrobat Reader 2015
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through arbitrary code execution, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Malicious PDF files delivered via phishing emails or compromised websites lead to system compromise of individual workstations.
If Mitigated
With proper security controls, exploitation attempts are blocked by endpoint protection, and user awareness prevents opening suspicious PDFs.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious PDF file. No public proof-of-concept has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Acrobat DC/Reader DC: 2020.009.20063 or later; Acrobat 2017/Reader 2017: 2017.011.30169 or later; Acrobat 2015/Reader 2015: 2015.006.30523 or later
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb20-24.html
Restart Required: Yes
Instructions:
1. Open Adobe Acrobat or Reader. 2. Navigate to Help > Check for Updates. 3. Follow prompts to download and install available updates. 4. Restart the application when prompted.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allPrevents JavaScript-based exploitation vectors in PDF files
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allOpens PDFs in sandboxed mode to limit potential damage
File > Properties > Security > Enable Protected View for all files
🧯 If You Can't Patch
- Restrict PDF file handling to alternative PDF viewers that are not vulnerable
- Implement application whitelisting to block execution of Adobe Acrobat/Reader
🔍 How to Verify
Check if Vulnerable:
Check Adobe Acrobat/Reader version via Help > About Adobe Acrobat/Reader and compare against affected versions.Check Version:
On Windows: wmic product where name like "Adobe Acrobat%" get version; On macOS: /Applications/Adobe\ Acrobat\ Reader\ DC.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify version is updated to patched versions: Acrobat DC/Reader DC 2020.009.20063+, Acrobat 2017/Reader 2017 2017.011.30169+, or Acrobat 2015/Reader 2015 2015.006.30523+.📡 Detection & Monitoring
Log Indicators:
- Application crashes in Adobe Acrobat/Reader logs
- Unexpected process creation from Acrobat/Reader processes
- Security software alerts for heap overflow attempts
Network Indicators:
- PDF file downloads from suspicious sources
- Outbound connections from Acrobat/Reader to unknown IPs post-PDF opening
SIEM Query:
source="*acrobat*" AND (event_type="crash" OR process_name="cmd.exe" OR process_name="powershell.exe")