Detections
Analytics
CVE-2019-19234
high
Description
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
References
https://www.tenable.com/plugins/nessus/132985
https://www.suse.com/security/cve/CVE-2019-19234/
https://www.sudo.ws/stable.html
https://www.sudo.ws/devel.html#1.8.30b2
https://www.oracle.com/security-alerts/bulletinapr2020.html
https://www.bsi.bund.de/SharedDocs/Warnmeldungen/DE/CB/2019/12/warnmeldung_cb-k20-0001.html
https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1019-3816
https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1018-5505
https://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-19234
https://security.netapp.com/advisory/ntap-20200103-0004/
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs60748
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58979
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58812
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58772
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58473
https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58104