CVE-2020-1483
📋 TL;DR
This is a remote code execution vulnerability in Microsoft Outlook where specially crafted files can trigger memory handling errors, allowing attackers to run arbitrary code as the current user. Users who open malicious email attachments or files from compromised websites are at risk, with administrative users facing complete system compromise.
💻 Affected Systems
- Microsoft Outlook
📦 What is this software?
365 Apps by Microsoft
Office by Microsoft
Outlook by Microsoft
Outlook by Microsoft
Outlook by Microsoft
Outlook by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, allowing installation of malware, data theft, and creation of new accounts.
Likely Case
Limited user account compromise leading to data access and lateral movement within the network.
If Mitigated
No impact if users don't open malicious files or if security controls block suspicious attachments.
🎯 Exploit Status
Requires user interaction (opening malicious file) and memory corruption exploitation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Microsoft security update for affected Outlook versions
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1483
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install all available security updates. 4. Restart computer if prompted.
🔧 Temporary Workarounds
Disable Preview Pane
windowsPrevents automatic file preview that could trigger the vulnerability
In Outlook: View tab > Change View > Reading Pane > Off
Block Suspicious Attachments
allConfigure email security to block potentially malicious file types
🧯 If You Can't Patch
- Implement strict email filtering to block suspicious attachments
- Train users to never open unexpected email attachments
🔍 How to Verify
Check if Vulnerable:
Check if Outlook version matches affected versions in Microsoft advisoryCheck Version:
In Outlook: File > Office Account > About OutlookVerify Fix Applied:
Verify Windows Update shows security update installed and Outlook version is patched📡 Detection & Monitoring
Log Indicators:
- Outlook crash logs, unexpected process execution from Outlook
Network Indicators:
- Unusual outbound connections from Outlook process
SIEM Query:
Process creation where parent process contains 'outlook.exe' and command line contains suspicious parameters