CVE-2019-8017
📋 TL;DR
This vulnerability in Adobe Acrobat and Reader allows attackers to execute arbitrary code by exploiting an untrusted pointer dereference. Successful exploitation could lead to complete system compromise. All users running affected versions of Adobe Acrobat or Reader are at risk.
💻 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
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Arbitrary code execution with the privileges of the current user, enabling malware installation, data exfiltration, or system disruption.
If Mitigated
Limited impact if systems are fully patched, have application whitelisting, or run with minimal user privileges.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious PDF file). The CVSS score of 9.8 indicates critical severity with low attack complexity.
🛠️ 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: Yes
Instructions:
1. Open Adobe Acrobat or Reader. 2. Go to Help > Check for Updates. 3. Follow the prompts to download and install available updates. 4. Restart the application when prompted. 5. Verify the update by checking Help > About Adobe Acrobat/Reader.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allDisabling JavaScript can prevent exploitation of this vulnerability as many PDF-based attacks rely on JavaScript execution.
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allEnable Protected View to open untrusted PDF files in a restricted mode that prevents code execution.
Edit > Preferences > Security (Enhanced) > Enable Protected View at startup
🧯 If You Can't Patch
- Restrict PDF file handling to alternative PDF viewers that are not vulnerable
- Implement application whitelisting to prevent execution of unauthorized code
🔍 How to Verify
Check if Vulnerable:
Check the version in Adobe Acrobat/Reader under Help > About Adobe Acrobat/Reader and compare with affected version ranges.Check Version:
On Windows: wmic product where "name like 'Adobe Acrobat%' or name like 'Adobe Reader%'" get version; On macOS: /usr/libexec/PlistBuddy -c 'Print :CFBundleShortVersionString' /Applications/Adobe\ Acrobat\ Reader\ DC.app/Contents/Info.plistVerify Fix Applied:
Verify the version is at or above the patched versions listed in the fix information.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes of Acrobat/Reader
- Suspicious child processes spawned from Acrobat/Reader
- Unusual file writes or registry modifications by Acrobat/Reader
Network Indicators:
- Outbound connections from Acrobat/Reader to suspicious IPs
- DNS requests for known malicious domains from Acrobat/Reader process
SIEM Query:
process_name:"AcroRd32.exe" OR process_name:"Acrobat.exe" AND (event_type:"process_creation" AND parent_process_name:"AcroRd32.exe" OR parent_process_name:"Acrobat.exe")