CVE-2022-44520
📋 TL;DR
CVE-2022-44520 is a use-after-free vulnerability in Adobe Acrobat Reader DC that could allow an attacker to execute arbitrary code on a victim's system. The vulnerability affects multiple versions of Acrobat Reader DC across different release tracks. Exploitation requires user interaction where the victim opens a malicious PDF file.
💻 Affected Systems
- Adobe Acrobat Reader DC
📦 What is this software?
Acrobat by Adobe
Acrobat by Adobe
Acrobat by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malicious code execution leading to credential theft, malware installation, or data exfiltration from the affected system.
If Mitigated
Limited impact with proper application sandboxing and security controls preventing successful exploitation or containing the damage.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious PDF). The use-after-free vulnerability requires specific memory manipulation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 22.001.20085 (Continuous Track), 20.005.30314 (Classic 2020 Track), 17.012.30206 (Classic 2017 Track)
Vendor Advisory: https://helpx.adobe.com/security/products/acrobat/apsb22-16.html
Restart Required: Yes
Instructions:
1. Open Adobe Acrobat Reader DC. 2. Go to Help > Check for Updates. 3. Follow the prompts to download and install the latest version. 4. Restart the application when prompted.
🔧 Temporary Workarounds
Disable JavaScript in Adobe Reader
allPrevents JavaScript-based exploitation vectors that might be used in conjunction with this vulnerability
Edit > Preferences > JavaScript > Uncheck 'Enable Acrobat JavaScript'
Use Protected View
allForces PDF files to open in Protected View mode which restricts certain functionality
Edit > Preferences > Security (Enhanced) > Check 'Enable Protected View at startup'
🧯 If You Can't Patch
- Restrict PDF file opening to trusted sources only using application control policies
- Implement network segmentation to limit lateral movement if exploitation occurs
🔍 How to Verify
Check if Vulnerable:
Check Adobe Acrobat Reader DC version via Help > About Adobe Acrobat Reader DC and compare with affected versionsCheck Version:
On Windows: wmic product where name="Adobe Acrobat Reader DC" get versionVerify Fix Applied:
Verify version is updated to 22.001.20085 or higher (Continuous), 20.005.30314 or higher (Classic 2020), or 17.012.30206 or higher (Classic 2017)📡 Detection & Monitoring
Log Indicators:
- Application crashes of Acrobat Reader with memory access violations
- Unexpected child processes spawned from Acrobat Reader
Network Indicators:
- Outbound connections from Acrobat Reader to unexpected destinations
- DNS requests for suspicious domains following PDF file opening
SIEM Query:
process_name:"AcroRd32.exe" AND (event_id:1000 OR event_id:1001) AND faulting_module NOT IN (expected_modules)