=========================================================================Ubuntu Security Notice USN-3840-1
December 06, 2018

openssl, openssl1.0 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 OpenSSL.

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

Details:

Samuel Weiser discovered that OpenSSL incorrectly handled DSA signing. An
attacker could possibly use this issue to perform a timing side-channel
attack and recover private DSA keys. (CVE-2018-0734)

Samuel Weiser discovered that OpenSSL incorrectly handled ECDSA signing. An
attacker could possibly use this issue to perform a timing side-channel
attack and recover private ECDSA keys. This issue only affected Ubuntu
18.04 LTS and Ubuntu 18.10. (CVE-2018-0735)

Billy Bob Brumley, Cesar Pereida Garcia, Sohaib ul Hassan, Nicola Tuveri,
and Alejandro Cabrera Aldaya discovered that Simultaneous Multithreading
(SMT) architectures are vulnerable to side-channel leakage. This issue is
known as "PortSmash". An attacker could possibly use this issue to perform
a timing side-channel attack and recover private keys. (CVE-2018-5407)

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-1ubuntu6.1
  libssl1.1                       1.1.1-1ubuntu2.1

Ubuntu 18.04 LTS:
  libssl1.0.0                     1.0.2n-1ubuntu5.2
  libssl1.1                       1.1.0g-2ubuntu4.3

Ubuntu 16.04 LTS:
  libssl1.0.0                     1.0.2g-1ubuntu4.14

Ubuntu 14.04 LTS:
  libssl1.0.0                     1.0.1f-1ubuntu2.27

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

References:
  https://ubuntu.com/security/notices/USN-3840-1
  CVE-2018-0734, CVE-2018-0735, CVE-2018-5407

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu6.1
  https://launchpad.net/ubuntu/+source/openssl/1.1.0g-2ubuntu4.3
  https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.2
  https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.14
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.27