USN-3553-1: Ruby vulnerabilities

31 January 2018

ruby2.3 vulnerabilities

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

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS


Several security issues were fixed in Ruby.

Software Description

  • ruby2.3 - Interpreter of object-oriented scripting language Ruby


It was discovered that Ruby failed to validate specification names. An attacker could possibly use a maliciously crafted gem to potentially overwrite any file on the filesystem. (CVE-2017-0901)

It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability. An attacker could use this to possibly force the RubyGems client to download and install gems from a server that the attacker controls. (CVE-2017-0902)

It was discovered that Ruby incorrectly handled certain YAML files. An attacker could use this to possibly execute arbitrary code. (CVE-2017-0903)

Update instructions

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

Ubuntu 17.10
libruby2.3 - 2.3.3-1ubuntu1.3
ruby2.3 - 2.3.3-1ubuntu1.3
Ubuntu 16.04 LTS
libruby2.3 - 2.3.1-2~16.04.6
ruby2.3 - 2.3.1-2~16.04.6

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.