=========================================================================Ubuntu Security Notice USN-3621-1
April 05, 2018

ruby1.9.1, ruby2.0, ruby2.3 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Ruby.

Software Description:
- ruby2.3: Object-oriented scripting language
- ruby1.9.1: Object-oriented scripting language
- ruby2.0: Object-oriented scripting language

Details:

It was discovered that Ruby incorrectly handled certain inputs. An
attacker could possibly use this to access sensitive information. 
(CVE-2018-1000073)

It was discovered that Ruby incorrectly handled certain files. An
attacker could possibly use this to execute arbitrary code. 
(CVE-2018-1000074)

It was discovered that Ruby incorrectly handled certain files. An
attacker could possibly use this to cause a denial of service. 
(CVE-2018-1000075)

It was discovered that Ruby incorrectly handled certain crypto
signatures. An attacker could possibly use this to execute arbitrary
code. (CVE-2018-1000076)

It was discovered that Ruby incorrectly handled certain inputs. An
attacker could possibly use this to execute arbitrary code. 
(CVE-2018-1000077, CVE-2018-1000078, CVE-2018-1000079)

Update instructions:

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

Ubuntu 17.10:
  libruby2.3                      2.3.3-1ubuntu1.4
  ruby2.3                         2.3.3-1ubuntu1.4

Ubuntu 16.04 LTS:
  libruby2.3                      2.3.1-2~16.04.7
  ruby2.3                         2.3.1-2~16.04.7

Ubuntu 14.04 LTS:
  libruby1.9.1                    1.9.3.484-2ubuntu1.8
  libruby2.0                      2.0.0.484-1ubuntu2.6
  ruby1.9.1                       1.9.3.484-2ubuntu1.8
  ruby1.9.3                       1.9.3.484-2ubuntu1.8
  ruby2.0                         2.0.0.484-1ubuntu2.6

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

References:
  https://ubuntu.com/security/notices/USN-3621-1
  CVE-2018-1000073, CVE-2018-1000074, CVE-2018-1000075, CVE-2018-1000076,
  CVE-2018-1000077, CVE-2018-1000078, CVE-2018-1000079

Package Information:
  https://launchpad.net/ubuntu/+source/ruby2.3/2.3.3-1ubuntu1.4
  https://launchpad.net/ubuntu/+source/ruby2.3/2.3.1-2~16.04.7
  https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.484-2ubuntu1.8
  https://launchpad.net/ubuntu/+source/ruby2.0/2.0.0.484-1ubuntu2.6