This bug was fixed in the package golang-1.14 - 1.14.7-2ubuntu2
---------------
golang-1.14 (1.14.7-2ubuntu2) hirsute; urgency=medium
* SECURITY UPDATE: XSS (LP: #1914372)
- debian/patches/CVE-2020-24553.patch: Add Content-Type detection in
net/http/cgi and net/http/fcgi.
- CVE-2020-24553
-- Dariusz Gadomski <dgadom...@ubuntu.com> Wed, 03 Feb 2021 09:44:21
+0100
** Changed in: golang-1.14 (Ubuntu Hirsute)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1914372
Title:
Ubuntu packages affected by CVE-2020-24553
Status in golang-1.14 package in Ubuntu:
Fix Released
Status in golang-1.15 package in Ubuntu:
Fix Released
Status in golang-1.10 source package in Xenial:
Fix Released
Status in golang-1.10 source package in Bionic:
Fix Released
Status in golang-1.14 source package in Focal:
Fix Released
Status in golang-1.14 source package in Groovy:
Fix Released
Status in golang-1.14 source package in Hirsute:
Fix Released
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 an affected golang 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]
* It has been specifically backported upstream in release 1.14 series
(Starting w/ 1.14.8) as follows:
https://go.googlesource.com/go/+/8fcee8abbea1bb959c63a6944f9ddf490a97f802
$ git tag --contains 8fcee8abbe
go1.14.10
go1.14.11
go1.14.12
go1.14.13
go1.14.14
go1.14.15
go1.14.8
go1.14.9
* The fix is present in golang-1.15 for hirsute and groovy.
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