The following updates has been released for Ubuntu Linux:

USN-3898-1: NSS vulnerability
USN-3898-2: NSS vulnerability
USN-3899-1: OpenSSL vulnerability

USN-3898-1: NSS vulnerability

==========================================================================
Ubuntu Security Notice USN-3898-1
February 27, 2019

nss 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:

NSS could be made to crash if it received specially crafted network
traffic.

Software Description:
- nss: Network Security Service library

Details:

Hanno Böck and Damian Poddebniak discovered that NSS incorrectly handled
certain CMS functions. A remote attacker could possibly use this issue to
cause NSS to crash, resulting in a denial of service.

Update instructions:

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

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

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

Ubuntu 16.04 LTS:
libnss3 2:3.28.4-0ubuntu0.16.04.5

Ubuntu 14.04 LTS:
libnss3 2:3.28.4-0ubuntu0.14.04.5

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-3898-1
CVE-2018-18508

Package Information:
https://launchpad.net/ubuntu/+source/nss/2:3.36.1-1ubuntu1.2
https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.2
https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.5
https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.14.04.5

USN-3898-2: NSS vulnerability

==========================================================================
Ubuntu Security Notice USN-3898-2
February 27, 2019

nss vulnerability
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

NSS could be made to crash if it received specially crafted network
traffic.

Software Description:
- nss: Network Security Service library

Details:

USN-3898-1 fixed a vulnerability in NSS. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Hanno Böck and Damian Poddebniak discovered that NSS incorrectly
 handled certain CMS functions. A remote attacker could possibly use
 this issue to cause NSS to crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 12.04 ESM:
  libnss3 2:3.28.4-0ubuntu0.12.04.3

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-3898-2
  https://usn.ubuntu.com/usn/usn-3898-1
  CVE-2018-18508

USN-3899-1: OpenSSL vulnerability

==========================================================================
Ubuntu Security Notice USN-3899-1
February 27, 2019

openssl, openssl1.0 vulnerability
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

OpenSSL could be made to expose sensitive information over the network.

Software Description:
- openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

Juraj Somorovsky, Robert Merget, and Nimrod Aviram discovered that certain
applications incorrectly used OpenSSL and could be exposed to a padding
oracle attack. A remote attacker could possibly use this issue to decrypt
data.

Update instructions:

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

Ubuntu 18.10:
libssl1.0.0 1.0.2n-1ubuntu6.2

Ubuntu 18.04 LTS:
libssl1.0.0 1.0.2n-1ubuntu5.3

Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.15

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3899-1
CVE-2019-1559

Package Information:
https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu6.2
https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.3
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.15