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Ubuntu Security Notice USN-2892-1
February 09, 2016

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

- Ubuntu 15.10
- 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 certain DNS server
responses when the resolver is enabled. A remote attacker could possibly
use this issue to cause nginx to crash, resulting in a denial of service.
(CVE-2016-0742)

It was discovered that nginx incorrectly handled CNAME response processing
when the resolver is enabled. A remote attacker could use this issue to
cause nginx to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-0746)

It was discovered that nginx incorrectly handled CNAME resolution when
the resolver is enabled. A remote attacker could possibly use this issue to
cause nginx to consume resources, resulting in a denial of service.
(CVE-2016-0747)

Update instructions:

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

Ubuntu 15.10:
  nginx-core                      1.9.3-1ubuntu1.1
  nginx-extras                    1.9.3-1ubuntu1.1
  nginx-full                      1.9.3-1ubuntu1.1
  nginx-light                     1.9.3-1ubuntu1.1

Ubuntu 14.04 LTS:
  nginx-core                      1.4.6-1ubuntu3.4
  nginx-extras                    1.4.6-1ubuntu3.4
  nginx-full                      1.4.6-1ubuntu3.4
  nginx-light                     1.4.6-1ubuntu3.4
  nginx-naxsi                     1.4.6-1ubuntu3.4

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

References:
  https://www.ubuntu.com/usn/usn-2892-1
  CVE-2016-0742, CVE-2016-0746, CVE-2016-0747

Package Information:
  https://launchpad.net/ubuntu/+source/nginx/1.9.3-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/nginx/1.4.6-1ubuntu3.4