Junglewise Threat Intelligence

CVE-2022-29145: Microsoft .NET denial of service in HTML form parsing

CVE-2022-29145 · Severity: high · CVSS 7.5 · Published 2022-08-30

Technologies: Microsoft .NET Core. Vendors: Microsoft.

Executive brief

A vulnerability in Microsoft .NET and ASP.NET Core could allow an attacker to crash or slow down web applications. This occurs when the software processes specially crafted web forms sent by a malicious user. If exploited, this could lead to a service outage, preventing legitimate customers from accessing the application.

Technical details

A denial of service (DoS) vulnerability exists in the HTML form parsing logic of .NET and ASP.NET Core. An unauthenticated remote attacker can trigger this vulnerability by sending a malicious request containing a specially crafted HTML form. The root cause is an inefficiency or flaw in how the runtime handles form data, leading to resource exhaustion or application hangs. The vulnerability affects .NET Core 3.1, .NET 5.0, and .NET 6.0. Microsoft has released patches in versions 3.1.25, 5.0.17, and 6.0.5 respectively to address the issue.

Affected products

  • Microsoft .NET Core 3.1.0 to 3.1.24
  • Microsoft .NET 5.0.0 to 5.0.16, 6.0.0 to 6.0.4
  • Microsoft Microsoft.AspNetCore.App.Runtime >= 3.0.0, < 3.1.25; >= 5.0.0, < 5.0.17; >= 6.0.0, < 6.0.5

Timeline

  • 2022-05-10: disclosed
  • 2022-05-10: patched
  • 2022-05-10: advisory

References

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