CVE-2019-8036
📋 TL;DR
This CVE describes a use-after-free vulnerability in Adobe Acrobat and Reader that could allow attackers to execute arbitrary code on affected systems. Users who open malicious PDF files with vulnerable versions are at risk. 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 with attacker gaining full control over the victim's computer, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malicious PDF files delivered via phishing emails or compromised websites lead to remote code execution, allowing attackers to install malware, steal credentials, or establish persistence.
If Mitigated
With proper controls like application whitelisting, network segmentation, and user training, exploitation attempts would be blocked or contained to isolated systems.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious PDF) but no authentication. The vulnerability is in memory management, making reliable exploitation straightforward for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Acrobat DC/Reader DC: 2019.012.20036 and later; Acrobat 2017/Reader 2017: 2017.011.30144 and later; Acrobat 2015/Reader 2015: 2015.006.30499 and later
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb19-41.html
Restart Required: No
Instructions:
1. Open Adobe Acrobat or Reader. 2. Go to Help > Check for Updates. 3. Follow prompts to install available updates. 4. Alternatively, download and install the latest version from Adobe's website.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allPrevents JavaScript-based exploitation vectors that might leverage this vulnerability
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allOpens PDFs in a sandboxed environment that limits potential damage
File > Properties > Security > Enable Protected View for files from potentially unsafe locations
🧯 If You Can't Patch
- Block PDF files at email gateways and web proxies
- Implement application whitelisting to prevent unauthorized executables from running
🔍 How to Verify
Check if Vulnerable:
Check Help > About Adobe Acrobat/Reader and compare version numbers against affected rangesCheck Version:
On Windows: wmic product where name like "%Adobe Acrobat%" get version; On macOS: /usr/bin/mdls -name kMDItemVersion /Applications/Adobe\ Acrobat\ Reader\ DC.appVerify Fix Applied:
Verify version is equal to or higher than the patched versions listed in the fix section📡 Detection & Monitoring
Log Indicators:
- Adobe crash reports with memory access violations
- Windows Event Logs showing AcroRd32.exe crashes with exception codes like 0xC0000005
Network Indicators:
- Unusual outbound connections from Acrobat/Reader processes
- PDF downloads from suspicious sources
SIEM Query:
process_name="AcroRd32.exe" AND (event_id=1000 OR exception_code=0xC0000005)