CVE-2019-8098
📋 TL;DR
This CVE describes an out-of-bounds write 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 across multiple release tracks are affected. Successful exploitation requires a user to open a malicious PDF file.
💻 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 persistent backdoor installation.
Likely Case
Local privilege escalation or malware installation when a user opens a malicious PDF document, potentially leading to credential theft or lateral movement within the network.
If Mitigated
Limited impact if systems are patched, users have limited privileges, and PDF files are opened in sandboxed environments or alternative viewers.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious PDF). No public proof-of-concept has been disclosed, but the high CVSS score suggests reliable exploitation is possible.
🛠️ 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. Navigate to Help > Check for Updates. 3. Follow prompts to download and install available updates. 4. Restart the application when prompted. Alternatively, download updates directly from Adobe's website.
🔧 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 to open untrusted PDFs in a restricted mode.
Edit > Preferences > Security (Enhanced) > Enable Protected View at startup
🧯 If You Can't Patch
- Restrict user privileges to prevent system-wide compromise if exploitation occurs.
- Implement application whitelisting to block unauthorized executables from running.
- Use alternative PDF viewers for untrusted documents.
- Block PDF files from untrusted sources at network perimeter.
🔍 How to Verify
Check if Vulnerable:
Open Adobe Acrobat or Reader, go to Help > About Adobe Acrobat/Reader, and compare version number against affected ranges.Check Version:
On Windows: wmic product where name like "Adobe Acrobat%" get version; On macOS: /usr/bin/mdls -name kMDItemVersion /Applications/Adobe\ Acrobat*/*.appVerify Fix Applied:
Verify version is 2019.012.20036 or later (DC), 2017.011.30144 or later (2017), or 2015.006.30499 or later (2015).📡 Detection & Monitoring
Log Indicators:
- Application crashes in Adobe Acrobat/Reader logs
- Unexpected child processes spawned from Acrobat/Reader
- Unusual file writes or registry modifications by Acrobat/Reader
Network Indicators:
- Outbound connections from Acrobat/Reader to unexpected destinations
- DNS requests for suspicious domains following PDF opening
SIEM Query:
source="*acrobat*" OR process_name="AcroRd32.exe" OR process_name="Acrobat.exe" AND (event_id=1000 OR event_id=1001) OR child_process_creation