3,000 Leaked ASP.NET Keys Exposing IIS Servers to Code Injection Attacks

Abhimanyu Singh
Abhimanyu Singh

Engineering Manager

 
February 7, 2025 2 min read

Key Insights:

Microsoft's Threat Intelligence team has identified over 3,000 publicly disclosed ASP.NET machine keys that are being exploited by attackers to perform ViewState code injection attacks. These keys, often found in publicly accessible resources like code repositories and documentation, are being used to inject malicious code into IIS web servers, leading to remote code execution.

Immediate Action Required:

  1. Avoid Publicly Available Keys: Developers should refrain from using machine keys found in public resources.

  2. Regular Key Rotation: Organizations should regularly rotate their machine keys to mitigate the risk of exploitation.

  3. Enhanced Monitoring: Use security tools like Microsoft Defender for Endpoint to detect exposed keys and monitor configuration files for unauthorized changes.

  4. Investigation and Remediation: If exploitation is suspected, merely rotating keys may not be sufficient. Conduct thorough investigations to identify and remove any backdoors or persistence mechanisms established by attackers.

Source: Hackernews

Background and Technical Details

ViewState is a method used in the ASP.NET framework to preserve page and control values between postbacks. By default, ViewState data is stored in a hidden field and encoded using base64 encoding. A hash of the ViewState data is created using a machine authentication code (MAC) key, ensuring that the data has not been tampered with. However, if these keys are stolen or made accessible to unauthorized third-parties, attackers can leverage them to send malicious ViewState requests and execute arbitrary code.

Microsoft's Recommendations:

Microsoft has provided a list of hash values for the publicly disclosed machine keys, urging customers to check them against the machine keys used in their environments. It has also warned that in the event of a successful exploitation of publicly disclosed keys, merely rotating the keys will not be sufficient as the threat actors may have already established persistence on the host.

GrackerAI's Role:

GrackerAI can help you stay updated on the latest cybersecurity news and convert these insights into SEO-optimized content in minutes. By leveraging GrackerAI, you can quickly create and distribute valuable content that keeps your audience informed and engaged.

Conclusion:

The recent discovery of over 3,000 leaked ASP.NET keys highlights the critical need for secure key management practices. As a cybersecurity marketer, leveraging tools like GrackerAI ensures you stay ahead of the curve, providing your clients with the latest insights and best practices to protect their digital assets. Stay tuned for more updates and insights from GrackerAI.

Abhimanyu Singh
Abhimanyu Singh

Engineering Manager

 

Engineering Manager driving innovation in AI-powered SEO automation. Leads the development of systems that automatically build and maintain scalable SEO portals from Google Search Console data. Oversees the design and delivery of automation pipelines that replace traditional $360K/year content teams—aligning engineering execution with business outcomes.

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