=========================================================================Ubuntu Security Notice USN-4235-1
January 13, 2020

nginx vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

nginx could be made to expose sensitive information over the network.

Software Description:
- nginx: small, powerful, scalable web/proxy server

Details:

Bert JW Regeer and Francisco Oca Gonzalez discovered that nginx incorrectly
handled certain error_page configurations. A remote attacker could possibly
use this issue to perform HTTP request smuggling attacks and access
resources contrary to expectations.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.10:
  nginx-common                    1.16.1-0ubuntu2.1
  nginx-core                      1.16.1-0ubuntu2.1
  nginx-extras                    1.16.1-0ubuntu2.1
  nginx-full                      1.16.1-0ubuntu2.1
  nginx-light                     1.16.1-0ubuntu2.1

Ubuntu 19.04:
  nginx-common                    1.15.9-0ubuntu1.2
  nginx-core                      1.15.9-0ubuntu1.2
  nginx-extras                    1.15.9-0ubuntu1.2
  nginx-full                      1.15.9-0ubuntu1.2
  nginx-light                     1.15.9-0ubuntu1.2

Ubuntu 18.04 LTS:
  nginx-common                    1.14.0-0ubuntu1.7
  nginx-core                      1.14.0-0ubuntu1.7
  nginx-extras                    1.14.0-0ubuntu1.7
  nginx-full                      1.14.0-0ubuntu1.7
  nginx-light                     1.14.0-0ubuntu1.7

Ubuntu 16.04 LTS:
  nginx-common                    1.10.3-0ubuntu0.16.04.5
  nginx-core                      1.10.3-0ubuntu0.16.04.5
  nginx-extras                    1.10.3-0ubuntu0.16.04.5
  nginx-full                      1.10.3-0ubuntu0.16.04.5
  nginx-light                     1.10.3-0ubuntu0.16.04.5

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4235-1
  CVE-2019-20372

Package Information:
  https://launchpad.net/ubuntu/+source/nginx/1.16.1-0ubuntu2.1
  https://launchpad.net/ubuntu/+source/nginx/1.15.9-0ubuntu1.2
  https://launchpad.net/ubuntu/+source/nginx/1.14.0-0ubuntu1.7
  https://launchpad.net/ubuntu/+source/nginx/1.10.3-0ubuntu0.16.04.5