CVE-2019-0922
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected systems by exploiting a memory corruption flaw in Microsoft Edge's Chakra JavaScript engine. Attackers can craft malicious web content that triggers the vulnerability when visited by users. All systems running vulnerable versions of Microsoft Edge are affected.
💻 Affected Systems
- Microsoft Edge
📦 What is this software?
Chakracore by Microsoft
Edge by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install programs, view/change/delete data, or create new accounts with full user rights.
Likely Case
Attackers execute malicious code in the context of the current user, potentially stealing sensitive data, installing malware, or performing other malicious actions.
If Mitigated
With proper patching and security controls, the vulnerability is eliminated; with workarounds, risk is significantly reduced but not completely removed.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website) but no authentication. No public proof-of-concept was disclosed at the time of advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Microsoft Edge version with April 2019 security updates (specific build numbers in advisory)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0922
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install all available security updates. 4. Restart system if prompted.
🔧 Temporary Workarounds
Disable JavaScript in Microsoft Edge
windowsPrevents execution of JavaScript that could trigger the vulnerability
Settings → View advanced settings → Turn off JavaScript
Use alternative browser
windowsSwitch to a different browser until Edge is patched
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized code execution
- Use network segmentation to isolate vulnerable systems and restrict internet access
🔍 How to Verify
Check if Vulnerable:
Check Microsoft Edge version: edge://settings/help → compare with patched versions in advisoryCheck Version:
edge://settings/help or Get-AppxPackage Microsoft.MicrosoftEdge | Select VersionVerify Fix Applied:
Verify Windows Update history shows April 2019 security updates installed and Edge version matches patched version📡 Detection & Monitoring
Log Indicators:
- Unexpected Edge crashes
- Suspicious process creation from Edge
- Unusual network connections from Edge
Network Indicators:
- Traffic to known malicious domains hosting exploit code
- Unusual JavaScript execution patterns
SIEM Query:
Process Creation where ParentImage contains 'MicrosoftEdge.exe' and CommandLine contains suspicious patterns