[Bug 1914372] Re: Ubuntu packages affected by CVE-2020-24553

[Dariusz Gadomski]

Patch proposal for golang-1.10 on Xenial.

** Patch added: "xenial_golang-1.10.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/golang-1.10/+bug/1914372/+attachment/5459328/+files/xenial_golang-1.10.debdiff

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Title:
  Ubuntu packages affected by CVE-2020-24553

Status in golang-1.10 package in Ubuntu:
  New
Status in golang-1.14 package in Ubuntu:
  New
Status in golang-1.10 source package in Xenial:
  New
Status in golang-1.14 source package in Xenial:
  Invalid
Status in golang-1.10 source package in Bionic:
  New
Status in golang-1.14 source package in Bionic:
  Invalid
Status in golang-1.14 source package in Focal:
  New
Status in golang-1.14 source package in Groovy:
  New
Status in golang-1.14 source package in Hirsute:
  New

Bug description:
  [Impact]

   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.

  [Test Case]

   Described as POC at https://www.redteam-pentesting.de/en/advisories
  /rt-sa-2020-004/-inconsistent-behavior-of-gos-cgi-and-fastcgi-
  transport-may-lead-to-cross-site-scripting:

   1. Use the snippet of CGI go code provided and run it: go run poc.go
   2. Run nginx with the config provided to forward the FastCGI calls to the go program.
   3. curl -i -o - http://localhost:8000
   4. Observe the output.

  In a affected go build the output will say:
  Content-Type: text/html (...)
  while in the fixed version it should recognize the content type correctly as:
  Content-Type: image/png

  [Where problems could occur]

   * It may affect deployments where go apps are used as CGI scripts -
  if the setup was incorrectly relying on hard-coded content type it may
  require fixing it.

  [Other Info]
   
   * The fix is present in golang-1.15 for hirsute and groovy.

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