CVE-2019-1153
📋 TL;DR
This CVE-2019-1153 is an information disclosure vulnerability in Microsoft Windows Graphics Component that allows an attacker to read memory contents they shouldn't access. It affects Windows systems where an attacker can run a specially crafted application. Successful exploitation could leak sensitive information that might help 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 access to sensitive memory contents (potentially including credentials, encryption keys, or other system data) which could lead to full system compromise through follow-on attacks.
Likely Case
Information disclosure that reveals memory layout or partial data, potentially enabling more targeted attacks against the system.
If Mitigated
Minimal impact with proper access controls preventing unauthorized application execution and timely patching.
🎯 Exploit Status
Exploit requires local access and ability to run specially crafted applications. Public proof-of-concept code exists demonstrating the out-of-bounds read vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: July 9, 2019 security updates
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1153
Restart Required: Yes
Instructions:
1. Apply Windows Update. 2. Select 'Check for updates'. 3. Install July 2019 security updates. 4. Restart system when prompted.
🔧 Temporary Workarounds
Restrict application execution
windowsImplement application whitelisting to prevent unauthorized applications from running
Use Windows AppLocker or similar application control solutions
Limit user privileges
windowsEnsure users run with least privilege necessary for their roles
Use Group Policy to restrict administrative privileges
🧯 If You Can't Patch
- Implement strict application control policies to prevent unauthorized application execution
- Segment networks to limit lateral movement and contain potential information disclosure
🔍 How to Verify
Check if Vulnerable:
Check if July 2019 Windows security updates are installed via Windows Update history or systeminfo commandCheck Version:
wmic qfe list | findstr KB4507453 (or appropriate KB number for your Windows version)Verify Fix Applied:
Verify KB4507453 (Windows 10 1903) or appropriate July 2019 security update is installed📡 Detection & Monitoring
Log Indicators:
- Unusual application execution events, suspicious process creation related to font handling
Network Indicators:
- Not network exploitable - local vulnerability only
SIEM Query:
Process creation events involving font-related DLLs or unusual memory access patterns🔗 References
- http://packetstormsecurity.com/files/154098/Microsoft-Font-Subsetting-DLL-FixSbitSubTableFormat1-Out-Of-Bounds-Read.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1153
- http://packetstormsecurity.com/files/154098/Microsoft-Font-Subsetting-DLL-FixSbitSubTableFormat1-Out-Of-Bounds-Read.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1153
