USN-3840-1: OpenSSL vulnerabilities

6 December 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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References