==========================================================================
Ubuntu Security Notice USN-3812-1
November 07, 2018

nginx vulnerabilities
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in nginx.

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

Details:

It was discovered that nginx incorrectly handled the HTTP/2 implementation.
A remote attacker could possibly use this issue to cause excessive memory
consumption, leading to a denial of service. This issue only affected
Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-16843)

Gal Goldshtein discovered that nginx incorrectly handled the HTTP/2
implementation. A remote attacker could possibly use this issue to cause
excessive CPU usage, leading to a denial of service. This issue only
affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 18.10.
(CVE-2018-16844)

It was discovered that nginx incorrectly handled the ngx_http_mp4_module
module. A remote attacker could possibly use this issue with a specially
crafted mp4 file to cause nginx to crash, stop responding, or access
arbitrary memory. (CVE-2018-16845)

Update instructions:

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

Ubuntu 18.10:
  nginx-common                    1.15.5-0ubuntu2.1
  nginx-core                      1.15.5-0ubuntu2.1
  nginx-extras                    1.15.5-0ubuntu2.1
  nginx-full                      1.15.5-0ubuntu2.1
  nginx-light                     1.15.5-0ubuntu2.1

Ubuntu 18.04 LTS:
  nginx-common                    1.14.0-0ubuntu1.2
  nginx-core                      1.14.0-0ubuntu1.2
  nginx-extras                    1.14.0-0ubuntu1.2
  nginx-full                      1.14.0-0ubuntu1.2
  nginx-light                     1.14.0-0ubuntu1.2

Ubuntu 16.04 LTS:
  nginx-common                    1.10.3-0ubuntu0.16.04.3
  nginx-core                      1.10.3-0ubuntu0.16.04.3
  nginx-extras                    1.10.3-0ubuntu0.16.04.3
  nginx-full                      1.10.3-0ubuntu0.16.04.3
  nginx-light                     1.10.3-0ubuntu0.16.04.3

Ubuntu 14.04 LTS:
  nginx-common                    1.4.6-1ubuntu3.9
  nginx-core                      1.4.6-1ubuntu3.9
  nginx-extras                    1.4.6-1ubuntu3.9
  nginx-full                      1.4.6-1ubuntu3.9
  nginx-light                     1.4.6-1ubuntu3.9

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

References:
  https://usn.ubuntu.com/usn/usn-3812-1
  CVE-2018-16843, CVE-2018-16844, CVE-2018-16845

Package Information:
  https://launchpad.net/ubuntu/+source/nginx/1.15.5-0ubuntu2.1
  https://launchpad.net/ubuntu/+source/nginx/1.14.0-0ubuntu1.2
  https://launchpad.net/ubuntu/+source/nginx/1.10.3-0ubuntu0.16.04.3
  https://launchpad.net/ubuntu/+source/nginx/1.4.6-1ubuntu3.9