CVE-2021-28466
📋 TL;DR
CVE-2021-28466 is a remote code execution vulnerability in Microsoft's Raw Image Extension that allows attackers to execute arbitrary code by tricking users into opening a specially crafted raw image file. This affects Windows users who have the Raw Image Extension installed, particularly those who open untrusted image files from email or web sources.
💻 Affected Systems
- Microsoft Raw Image Extension
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's machine, enabling data theft, ransomware deployment, or lateral movement within networks.
Likely Case
Malware installation leading to data exfiltration, credential theft, or system disruption for individual users who open malicious raw image files.
If Mitigated
Limited impact with proper user education and security controls preventing execution of malicious files, though some productivity disruption may occur.
🎯 Exploit Status
Exploitation requires user interaction to open malicious file; no public exploit code available as of last analysis
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Updated via Microsoft Store (automatic updates)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28466
Restart Required: No
Instructions:
1. Open Microsoft Store 2. Click 'Library' 3. Click 'Get updates' 4. Install updates for Raw Image Extension
🔧 Temporary Workarounds
Disable Raw Image Extension
windowsUninstall or disable the Raw Image Extension to prevent exploitation
Start > Settings > Apps > Apps & features > Raw Image Extension > Uninstall
Block raw image file extensions
windowsUse Group Policy or security software to block opening of raw image files
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized programs
- Educate users about risks of opening untrusted image files and implement email/web filtering for suspicious attachments
🔍 How to Verify
Check if Vulnerable:
Check Raw Image Extension version in Microsoft Store > Library > UpdatesCheck Version:
Not applicable - extension updated via Microsoft StoreVerify Fix Applied:
Verify Raw Image Extension shows as up to date in Microsoft Store📡 Detection & Monitoring
Log Indicators:
- Process creation events from RawImageExtension.exe with suspicious parameters
- Windows Defender or antivirus alerts for raw image files
Network Indicators:
- Outbound connections from RawImageExtension.exe to suspicious IPs
- DNS queries for known malicious domains
SIEM Query:
ProcessName="RawImageExtension.exe" AND (CommandLine CONTAINS "malicious" OR ParentProcessName="explorer.exe")