CVE-2018-11009
📋 TL;DR
A buffer overflow vulnerability in K7AntiVirus Premium allows attackers to execute arbitrary code by sending specially crafted data. This affects users running vulnerable versions of the antivirus software, potentially compromising their systems.
💻 Affected Systems
- K7AntiVirus Premium
📦 What is this software?
Antivrius by K7computing
Enterprise Security by K7computing
Total Security by K7computing
Ultimate Security by K7computing
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution, allowing attackers to install malware, steal data, or create persistent backdoors.
Likely Case
Local privilege escalation or denial of service, enabling attackers to gain higher privileges or crash the antivirus service.
If Mitigated
Limited impact if antivirus is patched or running with proper security controls like ASLR and DEP.
🎯 Exploit Status
Requires local access or ability to deliver malicious payload; buffer overflow exploitation requires specific conditions
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 15.01.00.53
Vendor Advisory: https://support.k7computing.com/index.php?/selfhelp/view-article/Advisory-issued-on-6th-January-2021
Restart Required: Yes
Instructions:
1. Open K7AntiVirus Premium. 2. Check for updates in settings. 3. Install available updates. 4. Restart computer to complete installation.
🔧 Temporary Workarounds
Disable vulnerable component
windowsTemporarily disable real-time scanning if patching is delayed
Enable DEP and ASLR
windowsEnable Data Execution Prevention and Address Space Layout Randomization to mitigate exploitation
🧯 If You Can't Patch
- Isolate affected systems from network to prevent lateral movement
- Implement application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check K7AntiVirus Premium version in program settings or Control Panel > Programs and FeaturesCheck Version:
wmic product where name="K7AntiVirus Premium" get versionVerify Fix Applied:
Verify version is newer than 15.01.00.53 and check for successful update in update history📡 Detection & Monitoring
Log Indicators:
- K7AntiVirus service crashes
- Unexpected process termination
- Memory access violations in event logs
Network Indicators:
- Unusual outbound connections from antivirus process
- Suspicious file writes by K7 processes
SIEM Query:
EventID=1000 OR EventID=1001 Source="K7*" OR ProcessName="K7*" AND (ExceptionCode="c0000005" OR ExceptionCode="c0000409")