CVE-2019-19234 Information

Description

LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks DISPUTED LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks 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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://access.redhat.com/security/cve/cve-2019-19234 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/ https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58104 https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58473 https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58772 https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58812 https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58979 https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs60748 https://security.netapp.com/advisory/ntap-20200103-0004/ https://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-19234 https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1018-5505 https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1019-3816 https://www.bsi.bund.de/SharedDocs/Warnmeldungen/DE/CB/2019/12/warnmeldung_cb-k20-0001.html https://www.oracle.com/security-alerts/bulletinapr2020.html https://www.sudo.ws/devel.html1.8.30b2 https://www.sudo.ws/stable.html https://www.suse.com/security/cve/CVE-2019-19234/ https://www.tenable.com/plugins/nessus/132985

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5