src: drop localhost6 as allowed host for inspector

CVE-ID: CVE-2021-22884
Refs: https://hackerone.com/bugs?report_id=1069487
PR-URL: nodejs-private/node-private#244
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Mary Marchini <oss@mmarchini.me>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: mcollina

Diff for: src/inspector_socket.cc

@@ -584,8 +584,7 @@ class HttpHandler : public ProtocolHandler {
   bool IsAllowedHost(const std::string& host_with_port) const {
     std::string host = TrimPort(host_with_port);
     return host.empty() || IsIPAddress(host)
-           || node::StringEqualNoCase(host.data(), "localhost")
-           || node::StringEqualNoCase(host.data(), "localhost6");
+           || node::StringEqualNoCase(host.data(), "localhost");
   }
 
   bool parsing_value_;