Ubuntu security

USN-4521-1: pam_tacplus vulnerability It was discovered that pam_tacplus did not properly manage shared secrets if DEBUG loglevel and journald are used. A remote attacker could use this issue to expose sensitive information. Source: USN-4521-1: pam_tacplus vulnerability

USN-4520-1: Exim SpamAssassin vulnerability It was discovered that Exim SpamAssassin does not properly handle configuration strings. An attacker could possibly use this issue to execute arbitrary code. (CVE-2019-19920) Source: USN-4520-1: Exim SpamAssassin vulnerability

USN-4519-1: PulseAudio vulnerability Ratchanan Srirattanamet discovered that an Ubuntu-specific patch caused PulseAudio to incorrectly handle memory under certain error conditions in the Bluez 5 module. An attacker could use this issue to cause PulseAudio to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-15710) Source: USN-4519-1: PulseAudio vulnerability

USN-4517-1: Email-Address-List vulnerability It was discovered that Email-Address-List does not properly parse email addresses during email-ingestion. A remote attacker could use this issue to cause an algorithmic complexity attack, resulting in a denial of service. (CVE-2018-18898) Source: USN-4517-1: Email-Address-List vulnerability

USN-4518-1: xawtv vulnerability Matthias Gerstner discovered that xawtv incorrectly handled opening files. A local attacker could possibly use this issue to open and write to arbitrary files and escalate privileges. (CVE-2020-13696) Source: USN-4518-1: xawtv vulnerability