CVE-2020-1092
📋 TL;DR
This is a remote code execution vulnerability in Internet Explorer where improper memory access allows attackers to execute arbitrary code. It affects users running vulnerable versions of Internet Explorer on Windows systems. An attacker could exploit this by tricking a user into viewing a specially crafted webpage.
💻 Affected Systems
- Internet Explorer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer, installing malware, stealing data, or joining systems to botnets.
Likely Case
Malware installation leading to data theft, ransomware deployment, or credential harvesting from the compromised system.
If Mitigated
Limited impact with proper security controls like application whitelisting, memory protection, and restricted user privileges preventing full system compromise.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious webpage) but no authentication. Memory corruption vulnerabilities typically require some sophistication to weaponize reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates for Internet Explorer released in May 2020
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1092
Restart Required: Yes
Instructions:
1. Apply the May 2020 Internet Explorer security update from Windows Update. 2. Alternatively, download and install the specific KB patch for your Windows version from Microsoft Update Catalog. 3. Restart the system after installation.
🔧 Temporary Workarounds
Disable Internet Explorer
windowsCompletely disable Internet Explorer and use alternative browsers like Microsoft Edge, Chrome, or Firefox.
Optional: Use Group Policy to disable IE or set default browser to Edge
Enable Enhanced Protected Mode
windowsEnable Internet Explorer Enhanced Protected Mode to add additional security layers.
Internet Options > Advanced tab > Enable Enhanced Protected Mode
🧯 If You Can't Patch
- Implement application control policies to block unauthorized code execution
- Restrict Internet Explorer usage to trusted sites only via Group Policy
🔍 How to Verify
Check if Vulnerable:
Check Internet Explorer version and compare with patched versions. Unpatched IE 9, 10, or 11 on affected Windows versions indicates vulnerability.Check Version:
Open Internet Explorer > Help > About Internet ExplorerVerify Fix Applied:
Verify that the May 2020 security update for Internet Explorer is installed via Windows Update history or by checking system patches.📡 Detection & Monitoring
Log Indicators:
- Internet Explorer crash logs with memory access violations
- Unexpected process creation from iexplore.exe
- Suspicious script execution in browser context
Network Indicators:
- Outbound connections to suspicious domains from Internet Explorer process
- Unusual HTTP requests to malicious domains
SIEM Query:
Process Creation where Parent Process contains 'iexplore.exe' AND Command Line contains suspicious patterns