[USN-5235-1] Ruby vulnerabilities

========================================================================== Ubuntu Security Notice USN-5235-1 January 18, 2022
ruby2.3, ruby2.5, ruby2.7 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.10 – Ubuntu 21.04 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS – Ubuntu 16.04 ESM
Summary:
Several security issues were fixed in Ruby.
Software Description: – 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 HTML files. An attacker could possibly use this issue to cause a crash. This issue only affected Ubuntu 20.04 LTS, Ubuntu 21.04, and Ubuntu 21.10. (CVE-2021-41816)
It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a regular expression denial of service. (CVE-2021-41817)
It was discovered that Ruby incorrectly handled certain cookie names. An attacker could possibly use this issue to access or expose sensitive information. (CVE-2021-41819)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 21.10: ruby2.7 2.7.4-1ubuntu3.1
Ubuntu 21.04: ruby2.7 2.7.2-4ubuntu1.3
Ubuntu 20.04 LTS: ruby2.7 2.7.0-5ubuntu1.6
Ubuntu 18.04 LTS: ruby2.5 2.5.1-1ubuntu1.11
Ubuntu 16.04 ESM: ruby2.3 2.3.1-2~ubuntu16.04.16+esm2
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5235-1 CVE-2021-41816, CVE-2021-41817, CVE-2021-41819
Package Information: launchpad.net/ubuntu/+source/ruby2.7/2.7.4-1ubuntu3.1 launchpad.net/ubuntu/+source/ruby2.7/2.7.2-4ubuntu1.3 launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.6 launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.11