USN-3475-1: OpenSSL vulnerabilities

Ubuntu Security Notice USN-3475-1

6th 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 version:

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.


CVE-2017-3735, CVE-2017-3736