USN-3899-1: OpenSSL vulnerability

27 February 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


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


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

To update your system, please follow these instructions:

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