Ubuntu security

USN-5330-1: LibreOffice vulnerability It was discovered that LibreOffice incorrectly handled digital signatures. An attacker could possibly use this issue to create a specially crafted document that would display a validly signed indicator, contrary to expectations. Source: USN-5330-1: LibreOffice vulnerability

USN-5329-1: tar vulnerability It was discovered that tar incorrectly handled certain files. An attacker could possibly use this issue to cause tar to crash, resulting in a denial of service. Source: USN-5329-1: tar vulnerability

USN-5328-1: OpenSSL vulnerability Tavis Ormandy discovered that OpenSSL incorrectly parsed certain certificates. A remote attacker could possibly use this issue to cause OpenSSH to stop responding, resulting in a denial of service. Source: USN-5328-1: OpenSSL vulnerability

USN-5327-1: rsh vulnerability Hiroyuki Yamamori discovered that rsh incorrectly handled certain filenames. If a user or automated system were tricked into connecting to a malicious rsh server, a remote attacker could possibly use this issue to modify directory permissions. Source: USN-5327-1: rsh vulnerability

USN-5325-1: Zsh vulnerabilities Sam Foxman discovered that Zsh incorrectly handled certain inputs. An attacker could possibly use this issue to regain dropped privileges. (CVE-2019-20044) It was discovered that Zsh incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. (CVE-2021-45444) Source: USN-5325-1: Zsh vulnerabilities