CVE-2019-1104
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected systems by exploiting memory corruption in Microsoft browsers. Attackers can craft malicious web content that triggers the vulnerability when visited. Users of vulnerable Microsoft browsers are affected.
💻 Affected Systems
- Microsoft Edge
- Internet Explorer
📦 What is this software?
Edge by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the victim's system, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Browser compromise leading to session hijacking, credential theft, and installation of malware or spyware on the victim's machine.
If Mitigated
Limited impact with browser sandboxing containing the exploit to browser process only, preventing full system compromise.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website) but no authentication. Memory corruption vulnerabilities typically require sophisticated exploitation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 2019 security updates (KB4507458 for Windows 10, KB4507456 for Windows 8.1, etc.)
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1104
Restart Required: Yes
Instructions:
1. Open Windows Update settings. 2. Check for updates. 3. Install July 2019 security updates. 4. Restart system when prompted. 5. Verify browser version is updated.
🔧 Temporary Workarounds
Disable Active Scripting
windowsConfigure Internet Explorer to disable Active Scripting in Internet and Local intranet security zones
Internet Options > Security tab > Custom Level > Scripting > Active scripting > Disable
Use Enhanced Protected Mode
windowsEnable Enhanced Protected Mode in Internet Explorer for additional memory protection
Internet Options > Advanced tab > Security > Enable Enhanced Protected Mode
🧯 If You Can't Patch
- Use alternative browsers like Chrome or Firefox that are not affected by this vulnerability
- Implement web filtering to block known malicious sites and restrict access to untrusted websites
🔍 How to Verify
Check if Vulnerable:
Check browser version: Internet Explorer - Help > About, Microsoft Edge - Settings > About Microsoft Edge. Compare with patched versions.Check Version:
wmic qfe list | findstr KB4507458 (for Windows 10) or check browser about pagesVerify Fix Applied:
Verify Windows Update history shows July 2019 security updates installed and browser version matches patched versions.📡 Detection & Monitoring
Log Indicators:
- Browser crash logs with memory access violations
- Windows Event Logs showing browser process termination
- Unexpected browser process spawning child processes
Network Indicators:
- HTTP requests to known exploit domains
- Unusual outbound connections from browser processes
- Traffic patterns matching exploit payload delivery
SIEM Query:
source="windows_security" event_id=1000 process_name="iexplore.exe" OR process_name="MicrosoftEdge.exe" exception_code=0xc0000005