==========================================================================
Ubuntu Security Notice USN-3528-1
January 10, 2018

ruby1.9.1, 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: Interpreter of object-oriented scripting language Ruby
– ruby1.9.1: Interpreter of object-oriented scripting language Ruby

Details:

It was discovered that Ruby incorrectly handled certain terminal
emulator escape sequences. An attacker could use this to execute
arbitrary code via a crafted user name. This issue only affected Ubuntu
16.04 LTS and Ubuntu 17.10. (CVE-2017-10784)

It was discovered that Ruby incorrectly handled certain strings.
An attacker could use this to cause a denial of service. This issue
only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-14033)

It was discovered that Ruby incorrectly handled some generating JSON.
An attacker could use this to possible expose sensitive information.
This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10.
(CVE-2017-14064)

It was discovered that Ruby incorrectly handled certain inputs.
An attacker could use this to execute arbitrary code.
(CVE-2017-17790)

Update instructions:

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

Ubuntu 17.10:
  libruby2.3                      2.3.3-1ubuntu1.2
  ruby2.3                         2.3.3-1ubuntu1.2

Ubuntu 16.04 LTS:
  libruby2.3                      2.3.1-2~16.04.5
  ruby2.3                         2.3.1-2~16.04.5

Ubuntu 14.04 LTS:
  libruby1.9.1                    1.9.3.484-2ubuntu1.7
  ruby1.9.1                       1.9.3.484-2ubuntu1.7
  ruby1.9.3                       1.9.3.484-2ubuntu1.7

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

References:
  https://www.ubuntu.com/usn/usn-3528-1
  CVE-2017-10784, CVE-2017-14033, CVE-2017-14064, CVE-2017-17790

Package Information:
  https://launchpad.net/ubuntu/+source/ruby2.3/2.3.3-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/ruby2.3/2.3.1-2~16.04.5
  https://launchpad.net/ubuntu/+source/ruby1.9.1/1.9.3.484-2ubuntu1.7
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