USN-2892-1: nginx vulnerabilities

Ubuntu Security Notice USN-2892-1

9th February, 2016

nginx vulnerabilities

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 version:

Ubuntu 15.10:
nginx-extras 1.9.3-1ubuntu1.1
nginx-full 1.9.3-1ubuntu1.1
nginx-core 1.9.3-1ubuntu1.1
nginx-light 1.9.3-1ubuntu1.1
Ubuntu 14.04 LTS:
nginx-extras 1.4.6-1ubuntu3.4
nginx-full 1.4.6-1ubuntu3.4
nginx-core 1.4.6-1ubuntu3.4
nginx-light 1.4.6-1ubuntu3.4
nginx-naxsi 1.4.6-1ubuntu3.4

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2016-0742, CVE-2016-0746, CVE-2016-0747