CVE-2019-8211
📋 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 through arbitrary code execution with the privileges of the current user, potentially leading to data theft, ransomware deployment, or lateral movement within networks.
Likely Case
Attackers trick users into opening malicious PDF files, leading to malware installation, credential theft, or system compromise.
If Mitigated
With proper patching and security controls, the risk is limited to isolated incidents that can be contained through endpoint protection and user awareness.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious PDF file. The use-after-free vulnerability makes reliable exploitation relatively straightforward for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Acrobat DC/Reader DC: 2019.012.20056 or later; Acrobat 2017/Reader 2017: 2017.011.30156 or later; Acrobat 2015/Reader 2015: 2015.006.30511 or later
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb19-49.html
Restart Required: No
Instructions:
1. Open Adobe Acrobat or Reader. 2. Go to Help > Check for Updates. 3. Follow the prompts to install available updates. 4. Alternatively, download the latest version from Adobe's website and install it.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allPrevents JavaScript-based exploitation vectors that might be used in conjunction with this vulnerability
In Adobe Reader: Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allOpen PDFs in Protected View to limit potential damage from malicious files
In Adobe Reader: File > Properties > Security > Enable Protected View for files from potentially unsafe locations
🧯 If You Can't Patch
- Implement application whitelisting to block unauthorized executables
- Use network segmentation to isolate systems running vulnerable versions
- Deploy endpoint detection and response (EDR) solutions to detect exploitation attempts
- Educate users about the risks of opening PDFs from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check Adobe Acrobat/Reader version: Open the application, go to Help > About Adobe Acrobat/Reader. Compare version numbers against affected ranges.Check Version:
On Windows: wmic product where "name like 'Adobe Acrobat%' or name like 'Adobe Reader%'" get name, versionVerify Fix Applied:
Verify version is updated to patched versions: Acrobat DC/Reader DC: 2019.012.20056+, Acrobat 2017/Reader 2017: 2017.011.30156+, Acrobat 2015/Reader 2015: 2015.006.30511+📡 Detection & Monitoring
Log Indicators:
- Adobe Acrobat/Reader crash logs with memory access violations
- Unexpected process creation from AcroRd32.exe or Acrobat.exe
- Suspicious PDF file access patterns
Network Indicators:
- Downloads of PDF files from suspicious sources
- Outbound connections from Adobe processes to unknown IPs
SIEM Query:
process_name:('AcroRd32.exe' OR 'Acrobat.exe') AND (event_id:1000 OR event_id:1001) AND exception_code:0xc0000005