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Ubuntu Security Notice USN-3163-1
January 04, 2017

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

- Ubuntu 16.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in NSS.

Software Description:
- nss: Network Security Service library

Details:

It was discovered that NSS incorrectly handled certain invalid
Diffie-Hellman keys. A remote attacker could possibly use this flaw to
cause NSS to crash, resulting in a denial of service. This issue only
applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-5285)

Hubert Kario discovered that NSS incorrectly handled Diffie Hellman client
key exchanges. A remote attacker could possibly use this flaw to perform a
small subgroup confinement attack and recover private keys. This issue only
applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-8635)

Franziskus Kiefer discovered that NSS incorrectly mitigated certain timing
side-channel attacks. A remote attacker could possibly use this flaw to
recover private keys. (CVE-2016-9074)

This update refreshes the NSS package to version 3.26.2 which includes
the latest CA certificate bundle.

Update instructions:

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

Ubuntu 16.10:
  libnss3                         2:3.26.2-0ubuntu0.16.10.1

Ubuntu 16.04 LTS:
  libnss3                         2:3.26.2-0ubuntu0.16.04.2

Ubuntu 14.04 LTS:
  libnss3                         2:3.26.2-0ubuntu0.14.04.3

Ubuntu 12.04 LTS:
  libnss3                         2:3.26.2-0ubuntu0.12.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use NSS, such as Evolution and Chromium, to make all the necessary
changes.

References:
  http://www.ubuntu.com/usn/usn-3163-1
  CVE-2016-5285, CVE-2016-8635, CVE-2016-9074

Package Information:
  https://launchpad.net/ubuntu/+source/nss/2:3.26.2-0ubuntu0.16.10.1
  https://launchpad.net/ubuntu/+source/nss/2:3.26.2-0ubuntu0.16.04.2
  https://launchpad.net/ubuntu/+source/nss/2:3.26.2-0ubuntu0.14.04.3
  https://launchpad.net/ubuntu/+source/nss/2:3.26.2-0ubuntu0.12.04.1