[USN-4882-1] Ruby vulnerabilities

========================================================================== Ubuntu Security Notice USN-4882-1 March 18, 2021
ruby2.3, ruby2.5, ruby2.7 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS – Ubuntu 16.04 LTS
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
It was discovered that the Ruby JSON gem incorrectly handled certain JSON files. If a user or automated system were tricked into parsing a specially crafted JSON file, a remote attacker could use this issue to execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2020-10663)
It was discovered that Ruby incorrectly handled certain socket memory operations. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-10933)
It was discovered that Ruby incorrectly handled certain transfer-encoding headers when using Webrick. A remote attacker could possibly use this issue to bypass a reverse proxy. (CVE-2020-25613)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10: libruby2.7 2.7.1-3ubuntu1.2 ruby2.7 2.7.1-3ubuntu1.2
Ubuntu 20.04 LTS: libruby2.7 2.7.0-5ubuntu1.3 ruby2.7 2.7.0-5ubuntu1.3
Ubuntu 18.04 LTS: libruby2.5 2.5.1-1ubuntu1.8 ruby2.5 2.5.1-1ubuntu1.8
Ubuntu 16.04 LTS: libruby2.3 2.3.1-2~ubuntu16.04.15 ruby2.3 2.3.1-2~ubuntu16.04.15
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-4882-1 CVE-2020-10663, CVE-2020-10933, CVE-2020-25613
Package Information: launchpad.net/ubuntu/+source/ruby2.7/2.7.1-3ubuntu1.2 launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.3 launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.8 launchpad.net/ubuntu/+source/ruby2.3/2.3.1-2~ubuntu16.04.15