==========================================================================
Ubuntu Security Notice USN-6219-1
July 12, 2023

ruby2.3, ruby2.5, ruby2.7, ruby3.0, ruby3.1 vulnerabilities
==========================================================================

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

- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in Ruby.

Software Description:
- ruby3.1: Interpreter of object-oriented scripting language Ruby
- ruby3.0: Interpreter of object-oriented scripting language Ruby
- ruby2.7: Object-oriented scripting language
- ruby2.5: Object-oriented scripting language
- ruby2.3: Object-oriented scripting language

Details:

It was discovered that Ruby incorrectly handled certain regular expressions.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 20.10 and Ubuntu 20.04 LTS.
(CVE-2023-28755)

It was discovered that Ruby incorrectly handled certain regular expressions.
An attacker could possibly use this issue to cause a denial of service.
This issue exists because of an incomplete fix for CVE-2023-28755.
(CVE-2023-36617)

Update instructions:

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

Ubuntu 23.04:
  libruby3.1                      3.1.2-6ubuntu0.23.04.2
  ruby3.1                         3.1.2-6ubuntu0.23.04.2

Ubuntu 22.10:
  libruby3.0                      3.0.4-7ubuntu0.2
  ruby3.0                         3.0.4-7ubuntu0.2

Ubuntu 22.04 LTS:
  libruby3.0                      3.0.2-7ubuntu2.4
  ruby3.0                         3.0.2-7ubuntu2.4

Ubuntu 20.04 LTS:
  libruby2.7                      2.7.0-5ubuntu1.12
  ruby2.7                         2.7.0-5ubuntu1.12

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  libruby2.5                      2.5.1-1ubuntu1.16+esm1
  ruby2.5                         2.5.1-1ubuntu1.16+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  libruby2.3                      2.3.1-2~ubuntu16.04.16+esm8
  ruby2.3                         2.3.1-2~ubuntu16.04.16+esm8

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

References:
  https://ubuntu.com/security/notices/USN-6219-1
  CVE-2023-28755, CVE-2023-36617

Package Information:
  https://launchpad.net/ubuntu/+source/ruby3.1/3.1.2-6ubuntu0.23.04.2
  https://launchpad.net/ubuntu/+source/ruby3.0/3.0.4-7ubuntu0.2
  https://launchpad.net/ubuntu/+source/ruby3.0/3.0.2-7ubuntu2.4
  https://launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.12