CVE-2019-1148
📋 TL;DR
CVE-2019-1148 is an information disclosure vulnerability in Microsoft Windows Graphics Component that allows authenticated attackers to read memory contents they shouldn't access. This affects Windows systems where an attacker can run specially crafted applications. The vulnerability could leak sensitive data that might help attackers further compromise the system.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Office by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 10 by Microsoft
Windows 7 by Microsoft
Windows 8.1 by Microsoft
Windows Rt 8.1 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains sensitive memory information that could lead to full system compromise through chained attacks
Likely Case
Information disclosure that could reveal system memory contents, potentially exposing credentials or other sensitive data
If Mitigated
Limited impact due to requiring authenticated access and specific application execution
🎯 Exploit Status
Exploit requires authenticated access and running a specially crafted application; public proof-of-concept demonstrates out-of-bounds read
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: August 2019 security updates
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1148
Restart Required: Yes
Instructions:
1. Apply August 2019 Windows security updates via Windows Update
2. For enterprise environments, deploy through WSUS or SCCM
3. Restart systems after patch installation
🔧 Temporary Workarounds
Restrict user privileges
windowsLimit user accounts to standard privileges to reduce attack surface
Application control policies
windowsImplement application whitelisting to prevent unauthorized applications from running
🧯 If You Can't Patch
- Implement strict access controls and limit user privileges
- Monitor for suspicious application execution and memory access patterns
🔍 How to Verify
Check if Vulnerable:
Check Windows version and patch level; systems without August 2019 security updates are vulnerableCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify August 2019 security updates are installed via Windows Update history or systeminfo command📡 Detection & Monitoring
Log Indicators:
- Unusual application execution events
- Process creation events for suspicious applications
Network Indicators:
- Not network exploitable - local vulnerability only
SIEM Query:
Process creation events where command line contains suspicious font or graphics manipulation parameters🔗 References
- http://packetstormsecurity.com/files/154084/Microsoft-Font-Subsetting-DLL-GetGlyphId-Out-Of-Bounds-Read.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1148
- http://packetstormsecurity.com/files/154084/Microsoft-Font-Subsetting-DLL-GetGlyphId-Out-Of-Bounds-Read.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1148
