Security notifications for Vonk

April 2018

Microsoft has published two Security Advisories regarding ASP.NET Core:

  • If you run Vonk behind Internet Information Server (IIS), you may be affected by “Microsoft Security Advisory CVE-2018-0808: ASP.NET Core Denial Of Service Vulnerability”. Refer to the related GitHub issue #294 for details and the fix.
  • If you expose Vonk directly to the internet, or host it behind a proxy which does not validate or restict host headers to known good values, you may be affected by “Microsoft Security Advisory CVE-2018-0787: ASP.NET Core Elevation Of Privilege Vulnerability”. Refer to the related GitHub issue #295 for details and the correct way of hosting Vonk. This ‘host validating middleware’ mentioned by this issue is not a part of Vonk. We advise you to run a publicly exposed Vonk behind a proxy or on an Azure Web App.