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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:
http://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

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