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Ubuntu Security Notice USN-7256-2
February 13, 2025

ruby2.7 regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

USN-7256-1 caused some minor regressions in Ruby

Software Description:
- ruby2.7: Object-oriented scripting language

Details:

USN-7256-1 fixed vulnerabilities in Ruby. The update introduced a minor
regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that Ruby incorrectly handled parsing of an XML document
 that has specific XML characters in an attribute value using REXML gem. An
 attacker could use this issue to cause Ruby to crash, resulting in a
 denial of service.

Update instructions:

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

Ubuntu 20.04 LTS
  libruby2.7                      2.7.0-5ubuntu1.17
  ruby2.7                         2.7.0-5ubuntu1.17

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

References:
  https://ubuntu.com/security/notices/USN-7256-2
  https://ubuntu.com/security/notices/USN-7256-1
  https://launchpad.net/bugs/2097527

Package Information:
  https://launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.17