CVE-2024-35264: Microsoft .NET RCE Vulnerability

CVE-2024-35264 Overview

CVE-2024-35264 is a Remote Code Execution vulnerability affecting Microsoft .NET and Visual Studio 2022. This use-after-free vulnerability enables attackers to execute arbitrary code on systems running vulnerable versions of the affected software through network-based attacks. The vulnerability requires no user interaction or privileges to exploit, though it has high attack complexity.

Critical Impact

Successful exploitation of this vulnerability could allow an attacker to achieve full system compromise through remote code execution, potentially leading to complete loss of confidentiality, integrity, and availability of the affected system.

Affected Products

• Microsoft .NET
• Microsoft Visual Studio 2022

Discovery Timeline

• 2024-07-09 - CVE-2024-35264 published to NVD
• 2025-05-06 - Last updated in NVD database

Technical Details for CVE-2024-35264

Vulnerability Analysis

This vulnerability stems from a use-after-free (CWE-416) memory corruption flaw in the .NET framework and Visual Studio 2022. Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, leading to unpredictable behavior including potential code execution. In the context of CVE-2024-35264, an attacker can trigger this condition remotely over the network without requiring any privileges or user interaction, though the attack complexity is considered high due to specific conditions that must be met for successful exploitation.

The impact of successful exploitation is severe—attackers can achieve complete compromise of confidentiality, integrity, and availability on the target system. This makes the vulnerability particularly dangerous in development environments where Visual Studio is used, as well as production systems running .NET applications.

Root Cause

The root cause of CVE-2024-35264 is a use-after-free memory safety issue (CWE-416) within the .NET runtime or Visual Studio components. This type of vulnerability occurs when program code maintains a reference to memory that has been deallocated and subsequently attempts to access or manipulate that memory region. When the freed memory is reallocated for other purposes and then accessed through the stale pointer, it can lead to memory corruption and potentially allow an attacker to execute arbitrary code.

Attack Vector

The attack vector for CVE-2024-35264 is network-based, meaning an attacker can exploit this vulnerability remotely without requiring physical access to the target system. The exploitation requires no privileges and no user interaction, making it a significant threat. However, the high attack complexity indicates that specific conditions must be present or carefully engineered for successful exploitation.

An attacker would need to craft malicious network traffic or payloads that trigger the use-after-free condition in a vulnerable .NET or Visual Studio environment. The technical details of the specific exploitation mechanism have not been publicly disclosed, but the vulnerability allows for complete system compromise upon successful exploitation.

For detailed technical information, refer to the Microsoft Security Update Guide.

Detection Methods for CVE-2024-35264

Indicators of Compromise

• Unexpected crashes or memory corruption errors in .NET applications or Visual Studio
• Anomalous network traffic targeting .NET-based services or applications
• Unusual process behavior or child processes spawned from .NET runtime or Visual Studio processes
• Memory access violations in application logs related to .NET components

Detection Strategies

• Monitor for abnormal behavior in .NET applications including unexpected terminations or memory errors
• Implement network intrusion detection rules to identify suspicious traffic patterns targeting .NET services
• Deploy endpoint detection and response (EDR) solutions to monitor for exploitation attempts and post-exploitation activity
• Enable detailed logging for .NET applications and Visual Studio to capture potential exploitation indicators

Monitoring Recommendations

• Configure Windows Event Logs to capture application crashes and memory-related errors for .NET processes
• Implement real-time monitoring of .NET application processes for anomalous behavior patterns
• Deploy SentinelOne agents on development workstations running Visual Studio and production servers hosting .NET applications
• Establish baseline behavior for .NET applications to facilitate anomaly detection

How to Mitigate CVE-2024-35264

Immediate Actions Required

• Apply the latest security updates from Microsoft for .NET and Visual Studio 2022 immediately
• Inventory all systems running affected .NET versions and Visual Studio 2022 installations
• Prioritize patching internet-facing systems and development environments
• Review network segmentation to limit exposure of vulnerable systems until patches are applied

Patch Information

Microsoft has released security patches addressing CVE-2024-35264. Organizations should apply the appropriate updates for their .NET and Visual Studio 2022 installations. Detailed patch information and download links are available in the Microsoft Security Update Guide for CVE-2024-35264.

For Visual Studio 2022, ensure you update to the latest servicing release. For .NET, apply the corresponding security patches for your installed framework versions.

Workarounds

• Restrict network access to .NET applications from untrusted networks where possible
• Implement network-level controls to limit exposure of vulnerable services
• Consider temporarily disabling non-essential .NET services until patches can be applied
• Use application whitelisting to prevent unauthorized code execution

# Check installed .NET versions on Windows
dotnet --list-sdks
dotnet --list-runtimes

# Verify Visual Studio version (run from Developer Command Prompt)
devenv /? | findstr "Version"