[USN-4922-2] Ruby vulnerability

========================================================================== Ubuntu Security Notice USN-4922-2 April 26, 2021
ruby2.7 vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.04
Ruby incorrectly handled XML documents.
Software Description: – ruby2.7: Object-oriented scripting language
USN-4922-1 fixed a vulnerability in Ruby. This update provides the corresponding update for Ubuntu 21.04.
Original advisory details:
Juho Nurminen discovered that the REXML gem bundled with Ruby incorrectly parsed and serialized XML documents. A remote attacker could possibly use this issue to perform an XML round-trip attack.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04: libruby2.7 2.7.2-4ubuntu1.1 ruby2.7 2.7.2-4ubuntu1.1
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-4922-2 ubuntu.com/security/notices/USN-4922-1 CVE-2021-28965
Package Information: launchpad.net/ubuntu/+source/ruby2.7/2.7.2-4ubuntu1.1