CVE-2020-8107
📋 TL;DR
This vulnerability allows attackers to tamper with Bitdefender antivirus settings by loading a specially crafted DLL file into ProductAgentUI.exe. It affects Bitdefender Antivirus Plus, Internet Security, and Total Security versions before 24.0.26.136. Attackers could potentially disable security features or modify product behavior.
💻 Affected Systems
- Bitdefender Antivirus Plus
- Bitdefender Internet Security
- Bitdefender Total Security
📦 What is this software?
Antivirus Plus by Bitdefender
Internet Security by Bitdefender
Total Security by Bitdefender
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of antivirus protection allowing malware to run undetected, disable real-time scanning, or modify security policies to enable further attacks.
Likely Case
Local privilege escalation allowing attackers to modify antivirus settings, potentially disabling protection features or enabling malicious activities.
If Mitigated
Limited impact if proper access controls prevent DLL loading from untrusted locations and antivirus is kept updated.
🎯 Exploit Status
Requires ability to place malicious DLL on target system and trigger its loading. Likely requires some level of local access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 24.0.26.136 or later
Vendor Advisory: https://www.bitdefender.com/support/security-advisories/process-control-vulnerability-bitdefender-antivirus-plus-va-8709/
Restart Required: Yes
Instructions:
1. Open Bitdefender interface. 2. Check for updates in settings. 3. Install available updates. 4. Restart computer if prompted. 5. Verify version is 24.0.26.136 or higher.
🔧 Temporary Workarounds
Restrict DLL loading permissions
windowsConfigure Windows to prevent loading of DLLs from untrusted locations
Use Windows Group Policy to restrict DLL loading paths
Configure AppLocker rules to block untrusted DLLs
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized users from placing files in application directories
- Monitor for suspicious DLL loading events using Windows Event Log monitoring
🔍 How to Verify
Check if Vulnerable:
Check Bitdefender version in the application interface or Windows Programs and Features. If version is lower than 24.0.26.136, system is vulnerable.Check Version:
wmic product where "name like 'Bitdefender%'" get versionVerify Fix Applied:
Verify Bitdefender version shows 24.0.26.136 or higher in the application interface.📡 Detection & Monitoring
Log Indicators:
- Windows Event Log entries showing DLL loading from unusual locations
- Bitdefender logs showing configuration changes
Network Indicators:
- No specific network indicators as this is a local exploit
SIEM Query:
EventID=7 OR EventID=11 from Sysmon showing DLL loading in Bitdefender directories from non-standard paths