==========================================================================
Ubuntu Security Notice USN-3692-1
June 26, 2018

openssl, openssl1.0 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- 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:

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

Guido Vranken discovered that OpenSSL incorrectly handled very large prime
values during a key agreement. A remote attacker could possibly use this
issue to consume resources, leading to a denial of service. (CVE-2018-0732)

Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis
Manuel Alvarez Tapia discovered that OpenSSL incorrectly handled RSA key
generation. An attacker could possibly use this issue to perform a
cache-timing attack and recover private RSA keys. (CVE-2018-0737)

Update instructions:

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

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

Ubuntu 17.10:
  libssl1.0.0                     1.0.2g-1ubuntu13.6

Ubuntu 16.04 LTS:
  libssl1.0.0                     1.0.2g-1ubuntu4.13

Ubuntu 14.04 LTS:
  libssl1.0.0                     1.0.1f-1ubuntu2.26

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

References:
  https://usn.ubuntu.com/usn/usn-3692-1
  CVE-2018-0495, CVE-2018-0732, CVE-2018-0737

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.1.0g-2ubuntu4.1
  https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.1
  https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu13.6
  https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.13
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.26