External risk intelligence

.NET and Visual Studio Denial of Service Vulnerability.

CVE advisoryKnown Exploit

CVE-2023-38180

A denial-of-service vulnerability affects .NET and Visual Studio, allowing attackers to disrupt services. This matters because it can make systems unresponsive, leading to business downtime. The risk involves service unavailability for legitimate users.

4Halo Surface Signal

Denial of Service

Microsoft Net

6.0.0 to before 6.0.217.0.0 to before 7.0.102.1 to before 2.1.4017.2.0 to before 17.2.1817.4.0 to before 17.4.1017.6.0 to before 17.6.63738

External exposure likelihood

Halo Surface Signal score for CVE-2023-38180

The vulnerability affects .NET and ASP.NET Core, which are widely used frameworks for hosting web applications and API services. While the impact is a denial of service, these frameworks are standard for public-facing web infrastructure, making the underlying surface commonly reachable from the internet in typical deployments.

Horizon Alert

Summary of the vulnerability and why it matters

A denial-of-service vulnerability exists within Microsoft .NET and Visual Studio. This flaw allows an unauthenticated attacker to disrupt the normal operation of affected systems. The primary consequence of this vulnerability is the inability for legitimate users to access services, leading to business disruption.

  • Vulnerable .NET and Visual Studio
  • System denial of service
  • Business disruption and downtime

Attack Path

How an attacker could exploit the issue

This vulnerability impacts .NET and Visual Studio, potentially disrupting services. An attacker can exploit this by sending specially crafted requests to an affected application. This can lead to the application becoming unresponsive, impacting users and business operations.

  • Network access to the application.
  • Attacker sends malicious requests.
  • Service becomes unavailable.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to disrupt services by making them unavailable to legitimate users. Exploitation does not require elevated privileges or user interaction, meaning that attackers could potentially trigger this vulnerability remotely. The potential for service disruption warrants careful consideration.

  • Attacker skill level: Low
  • Required access or conditions: None
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts .NET and Visual Studio, potentially affecting the availability of affected systems. Organizations should prioritize understanding their exposure and implementing necessary protections. Addressing this issue helps maintain operational continuity and protects business services.

  • Identify systems using affected software.
  • Reduce exposure or isolate affected systems.
  • Apply vendor updates and validate fixes.
  • Monitor for related security events.

Frequently asked questions

What is Microsoft .NET and Visual Studio?

Microsoft .NET is a framework used to build and run various applications, especially web services and applications. Visual Studio is an integrated development environment (IDE) used by developers to create software. These technologies are widely used for developing and deploying applications across different platforms.

What kind of weakness does CVE-2023-38180 represent?

CVE-2023-38180 is a denial-of-service vulnerability. This weakness, categorized as CWE-400, allows an attacker to overwhelm a system or application, making it unresponsive and unavailable to legitimate users.

How can an attacker exploit this denial-of-service vulnerability?

An attacker can exploit this vulnerability by sending specially crafted requests to an affected .NET or Visual Studio application. Exploitation does not require any special privileges or user interaction on the part of the attacker. The vulnerability is triggered by these malicious requests, leading to service disruption.

Who needs to be concerned about this external-facing vulnerability?

Organizations that expose .NET or ASP.NET Core applications to the internet should be concerned. This includes services and APIs that are accessible from the outside, as the vulnerability's nature and its common deployment in web infrastructure make it a likely target for external threats.

What are the first steps to address this threat?

Begin by identifying all systems that use the affected versions of .NET and Visual Studio. It is crucial to apply security updates provided by Microsoft as soon as possible. Organizations should also monitor for any unusual activity that might indicate exploitation.

References