In Sudo through 1.8.29, the fact that a user has been blocked (e.g., by using the ! character in the shadow file instead of a password hash) is not considered, allowing an attacker (who has access to a Runas ALL sudoer account) to impersonate any blocked user. CREATE(Triage):(User=admin) CVE-2019-19234 (https://nvd.nist.gov/vuln/detail/CVE-2019-19234)
