Ubuntu Security Notice USN-5121-2

Ubuntu Security Notice 5121-2 - USN-5009-1 fixed vulnerabilities in Mailman. This update provides the corresponding updates for Ubuntu 20.04 LTS. It was discovered that Mailman allows arbitrary content injection. An attacker could use this to inject malicious content. It was discovered that Mailman improperly sanitize the MIME content. An attacker could obtain sensitive information by sending a special type of attachment.