USN-3475-1: OpenSSL vulnerabilities

6 November 2017

openssl vulnerabilities

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

  • Ubuntu 17.10
  • Ubuntu 17.04
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Several security issues were fixed in OpenSSL.

Software Description

  • openssl - Secure Socket Layer (SSL) cryptographic library and tools


It was discovered that OpenSSL incorrectly parsed the IPAddressFamily extension in X.509 certificates, resulting in an erroneous display of the certificate in text format. (CVE-2017-3735)

It was discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys. This issue only applied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-3736)

Update instructions

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

Ubuntu 17.10
libssl1.0.0 - 1.0.2g-1ubuntu13.2
Ubuntu 17.04
libssl1.0.0 - 1.0.2g-1ubuntu11.3
Ubuntu 16.04 LTS
libssl1.0.0 - 1.0.2g-1ubuntu4.9
Ubuntu 14.04 LTS
libssl1.0.0 - 1.0.1f-1ubuntu2.23

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.