A nginx security update has been released for Ubuntu Linux 14.04 ESM.

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Ubuntu Security Notice USN-4235-2
January 15, 2020

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

- Ubuntu 14.04 ESM

Summary:

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

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

Details:

USN-4235-1 fixed a vulnerability in nginx. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
nginx-common 1.4.6-1ubuntu3.9+esm1
nginx-core 1.4.6-1ubuntu3.9+esm1
nginx-extras 1.4.6-1ubuntu3.9+esm1
nginx-full 1.4.6-1ubuntu3.9+esm1
nginx-light 1.4.6-1ubuntu3.9+esm1

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

References:
https://usn.ubuntu.com/4235-2
https://usn.ubuntu.com/4235-1
CVE-2019-20372