CVE-2022-24464
📋 TL;DR
CVE-2022-24464 is a denial of service vulnerability in .NET and Visual Studio that allows attackers to crash affected applications by sending specially crafted requests. This affects systems running vulnerable versions of .NET Framework, .NET Core, and Visual Studio. The vulnerability can be exploited remotely without authentication.
💻 Affected Systems
- .NET Framework
- .NET Core
- Visual Studio
📦 What is this software?
.net by Microsoft
.net by Microsoft
.net Core by Microsoft
Fedora by Fedoraproject
Fedora by Fedoraproject
Fedora by Fedoraproject
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of affected applications, potentially affecting multiple services if shared components are targeted, leading to business downtime.
Likely Case
Targeted application crashes requiring restart, causing temporary service interruption and potential data loss in active sessions.
If Mitigated
Minimal impact with proper network segmentation and monitoring allowing quick detection and response to attack attempts.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to vulnerable endpoints. No authentication required for remote exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: .NET Framework 4.8.1, .NET Core 3.1.23, 5.0.15, 6.0.3; Visual Studio 2019 16.11.18, 2022 17.0.5
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-24464
Restart Required: Yes
Instructions:
1. Apply security updates from Windows Update or Microsoft Update Catalog. 2. For .NET Core, update runtime and SDK packages. 3. For Visual Studio, update through Visual Studio Installer. 4. Restart affected systems and applications.
🔧 Temporary Workarounds
Network Filtering
allBlock suspicious requests at network perimeter or application firewall
Application Hardening
allImplement request validation and input sanitization in affected applications
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy web application firewall with DoS protection rules
🔍 How to Verify
Check if Vulnerable:
Check .NET version with 'dotnet --info' or examine installed programs in Windows. For Visual Studio, check Help > About.Check Version:
dotnet --info (for .NET Core) or check registry for .NET Framework versionsVerify Fix Applied:
Verify installed version matches patched versions listed in vendor advisory. Test application stability under normal load.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Unexpected process termination
- High error rates in application logs
Network Indicators:
- Unusual request patterns to .NET endpoints
- Spike in failed requests
- Abnormal traffic to specific ports
SIEM Query:
EventID: 1000 OR EventID: 1001 (Application crashes) AND ProcessName contains 'dotnet' OR 'w3wp'