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USN-6055-2: Ruby regression

5 May 2023

USN-6055-1 introduced a regression.

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Releases

Packages

  • ruby2.3 - Object-oriented scripting language
  • ruby2.5 - Object-oriented scripting language
  • ruby2.7 - Object-oriented scripting language

Details

USN-6055-1 fixed a vulnerability in Ruby. Unfortunately it introduced a regression.
This update reverts the patches applied to CVE-2023-28755 in order to fix the regression
pending further investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Ruby incorrectly handled certain regular expressions.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2023-28755)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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

Related notices

  • USN-6055-1: libruby2.3, ruby2.3-tcltk, ruby2.7, ruby2.3-dev, libruby2.7, ruby2.3-doc, ruby2.5-dev, ruby2.7-dev, libruby2.5, ruby2.7-doc, ruby2.3, ruby2.5-doc, ruby2.5
  • USN-6087-1: libruby2.3, ruby2.3-tcltk, ruby2.7, ruby2.3-dev, libruby2.7, ruby2.3-doc, ruby2.5-dev, ruby2.7-dev, libruby2.5, ruby2.7-doc, ruby2.3, ruby2.5-doc, ruby2.5
  • USN-6181-1: libruby3.1, ruby3.1-doc, ruby3.1-dev, ruby3.1
  • USN-6219-1: ruby2.7, ruby3.1-dev, ruby2.3-tcltk, ruby3.0-doc, libruby2.7, ruby2.3-dev, ruby2.3-doc, ruby3.1, ruby2.7-dev, ruby3.0-dev, ruby2.5-doc, libruby3.0, ruby2.5, libruby2.3, ruby2.5-dev, libruby2.5, ruby2.7-doc, ruby2.3, libruby3.1, ruby3.0, ruby3.1-doc