{"id":"UBUNTU-CVE-2019-19234","details":"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. NOTE: The software maintainer believes that this CVE is not valid. Disabling local password authentication for a user is not the same as disabling all access to that user--the user may still be able to login via other means (ssh key, kerberos, etc). Both the Linux shadow(5) and passwd(1) manuals are clear on this. Indeed it is a valid use case to have local accounts that are _only_ accessible via sudo and that cannot be logged into with a password. Sudo 1.8.30 added an optional setting to check the _shell_ of the target user (not the encrypted password!) against the contents of /etc/shells but that is not the same thing as preventing access to users with an invalid password hash","modified":"2025-09-08T16:45:43Z","published":"2019-12-19T21:15:00Z","upstream":["CVE-2019-19234"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-19234"},{"type":"REPORT","url":"https://www.sudo.ws/devel.html#1.8.30b2"},{"type":"REPORT","url":"https://www.sudo.ws/stable.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-19234"}],"affected":[{"package":{"name":"sudo","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/sudo@1.8.31-1ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.31-1ubuntu1"}]}],"versions":["1.8.27-1ubuntu4","1.8.29-1ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"sudo","binary_version":"1.8.31-1ubuntu1"},{"binary_name":"sudo-ldap","binary_version":"1.8.31-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-19234.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}