CVE-2020-24553

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM Security Guardium ausnutzen, um beliebigen Programmcode auszuführen, Informationen offenzulegen, Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service Zustand herbeizuführen.

Go before 1.14.8 and 1.15.x before 1.15.1 allows XSS because text/html is the default for CGI/FCGI handlers that lack a Content-Type header.

When a Handler does not explicitly set the Content-Type header, the the package would default to “text/html”, which could cause a Cross-Site Scripting vulnerability if an attacker can control any part of the contents of a response. The Content-Type header is now set based on the contents of the first Write using http.DetectContentType, which is consistent with the behavior of the net/http package. Although this protects some applications that validate the contents of uploaded files, not setting the Content-Type header explicitly on any attacker-controlled file is unsafe and should be avoided.