CVE-2019-1192
📋 TL;DR
This CVE describes a Same-Origin Policy bypass vulnerability in Microsoft browsers that allows attackers to force browsers to send cross-origin data that should be restricted. It affects users of Microsoft Edge and Internet Explorer. Successful exploitation could lead to unauthorized data access.
💻 Affected Systems
- Microsoft Edge
- Internet Explorer
📦 What is this software?
Edge by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal sensitive user data (cookies, session tokens, personal information) from other websites the user is logged into, potentially leading to account takeover and data breaches.
Likely Case
Attackers could perform cross-site request forgery (CSRF) attacks, steal limited user data from vulnerable sites, or bypass security controls on web applications.
If Mitigated
With proper browser updates, the vulnerability is eliminated. With network segmentation and web application firewalls, impact is limited to potential CSRF attacks.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website) and knowledge of target sites. No public exploit code was disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security updates released in August 2019 Patch Tuesday
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1192
Restart Required: Yes
Instructions:
1. Apply August 2019 security updates from Windows Update. 2. For enterprise: Deploy through WSUS or SCCM. 3. Restart affected systems after patching.
🔧 Temporary Workarounds
Disable affected browsers
windowsUse alternative browsers like Chrome or Firefox that are not affected by this vulnerability
Enable Enhanced Security Configuration
windowsFor Internet Explorer, enable Enhanced Security Configuration to restrict script execution
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers on web applications
- Deploy web application firewall with CSRF protection and Same-Origin Policy enforcement
🔍 How to Verify
Check if Vulnerable:
Check browser version: Edge - edge://settings/help, IE - Help > About. If version predates August 2019 updates, system is vulnerable.Check Version:
For Edge: edge://settings/help, For IE: Run 'reg query "HKLM\SOFTWARE\Microsoft\Internet Explorer" /v svcVersion'Verify Fix Applied:
Verify Windows Update history shows August 2019 security updates installed, or browser version shows post-patch build numbers.📡 Detection & Monitoring
Log Indicators:
- Unusual cross-origin requests in web server logs
- Multiple failed Same-Origin Policy validations
Network Indicators:
- Suspicious cross-origin XMLHttpRequests
- Unexpected CORS preflight requests
SIEM Query:
source="web_server" AND (http_referer CONTAINS suspicious_domain OR origin_header != host_header)