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

nginx vulnerabilities
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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

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