The following two updates has been released for Ubuntu Linux:

USN-3850-1: NSS vulnerabilities
USN-3851-1: Django vulnerability

USN-3850-1: NSS vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3850-1
January 09, 2019

nss vulnerabilities
==========================================================================

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 NSS.

Software Description:
- nss: Network Security Service library

Details:

Keegan Ryan discovered that NSS incorrectly handled ECDSA key generation.
A local attacker could possibly use this issue to perform a cache-timing
attack and recover private ECDSA keys. (CVE-2018-0495)

It was discovered that NSS incorrectly handled certain v2-compatible
ClientHello messages. A remote attacker could possibly use this issue to
perform a replay attack. (CVE-2018-12384)

It was discovered that NSS incorrectly handled certain padding oracles. A
remote attacker could possibly use this issue to perform a variant of the
Bleichenbacher attack. (CVE-2018-12404)

Update instructions:

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

Ubuntu 18.10:
libnss3 2:3.36.1-1ubuntu1.1

Ubuntu 18.04 LTS:
libnss3 2:3.35-2ubuntu2.1

Ubuntu 16.04 LTS:
libnss3 2:3.28.4-0ubuntu0.16.04.4

Ubuntu 14.04 LTS:
libnss3 2:3.28.4-0ubuntu0.14.04.4

After a standard system update you need to restart any applications that
use NSS, such as Evolution, to make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3850-1
CVE-2018-0495, CVE-2018-12384, CVE-2018-12404

Package Information:
https://launchpad.net/ubuntu/+source/nss/2:3.36.1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.1
https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.4
https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.14.04.4

USN-3851-1: Django vulnerability

==========================================================================
Ubuntu Security Notice USN-3851-1
January 09, 2019

python-django vulnerability
==========================================================================

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:

Django could be made to expose spoofed information over the network.

Software Description:
- python-django: High-level Python web development framework

Details:

It was discovered that Django incorrectly handled the default 404 page. A
remote attacker could use this issue to spoof content using a malicious
URL.

Update instructions:

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

Ubuntu 18.10:
python-django 1:1.11.15-1ubuntu1.1
python3-django 1:1.11.15-1ubuntu1.1

Ubuntu 18.04 LTS:
python-django 1:1.11.11-1ubuntu1.2
python3-django 1:1.11.11-1ubuntu1.2

Ubuntu 16.04 LTS:
python-django 1.8.7-1ubuntu5.7
python3-django 1.8.7-1ubuntu5.7

Ubuntu 14.04 LTS:
python-django 1.6.11-0ubuntu1.3

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

References:
https://usn.ubuntu.com/usn/usn-3851-1
CVE-2019-3498

Package Information:
https://launchpad.net/ubuntu/+source/python-django/1:1.11.15-1ubuntu1.1
https://launchpad.net/ubuntu/+source/python-django/1:1.11.11-1ubuntu1.2
https://launchpad.net/ubuntu/+source/python-django/1.8.7-1ubuntu5.7
https://launchpad.net/ubuntu/+source/python-django/1.6.11-0ubuntu1.3