cve-2019-19234
Vulnerability from cvelistv5
Published
2019-12-19 20:35
Modified
2024-08-05 02:09
Severity ?
Summary
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
cve@mitre.orghttps://access.redhat.com/security/cve/cve-2019-19234
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/
cve@mitre.orghttps://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58104
cve@mitre.orghttps://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58473
cve@mitre.orghttps://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58772
cve@mitre.orghttps://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58812
cve@mitre.orghttps://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58979
cve@mitre.orghttps://quickview.cloudapps.cisco.com/quickview/bug/CSCvs60748
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20200103-0004/
cve@mitre.orghttps://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-19234
cve@mitre.orghttps://support2.windriver.com/index.php?page=defects&on=view&id=LIN1018-5505
cve@mitre.orghttps://support2.windriver.com/index.php?page=defects&on=view&id=LIN1019-3816
cve@mitre.orghttps://www.bsi.bund.de/SharedDocs/Warnmeldungen/DE/CB/2019/12/warnmeldung_cb-k20-0001.html
cve@mitre.orghttps://www.oracle.com/security-alerts/bulletinapr2020.html
cve@mitre.orghttps://www.sudo.ws/devel.html#1.8.30b2Vendor Advisory
cve@mitre.orghttps://www.sudo.ws/stable.htmlVendor Advisory
cve@mitre.orghttps://www.suse.com/security/cve/CVE-2019-19234/
cve@mitre.orghttps://www.tenable.com/plugins/nessus/132985
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/cve-2019-19234
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/
af854a3a-2127-422b-91ae-364da2661108https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58104
af854a3a-2127-422b-91ae-364da2661108https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58473
af854a3a-2127-422b-91ae-364da2661108https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58772
af854a3a-2127-422b-91ae-364da2661108https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58812
af854a3a-2127-422b-91ae-364da2661108https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58979
af854a3a-2127-422b-91ae-364da2661108https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs60748
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20200103-0004/
af854a3a-2127-422b-91ae-364da2661108https://support2.windriver.com/index.php?page=cve&on=view&id=CVE-2019-19234
af854a3a-2127-422b-91ae-364da2661108https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1018-5505
af854a3a-2127-422b-91ae-364da2661108https://support2.windriver.com/index.php?page=defects&on=view&id=LIN1019-3816
af854a3a-2127-422b-91ae-364da2661108https://www.bsi.bund.de/SharedDocs/Warnmeldungen/DE/CB/2019/12/warnmeldung_cb-k20-0001.html
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/bulletinapr2020.html
af854a3a-2127-422b-91ae-364da2661108https://www.sudo.ws/devel.html#1.8.30b2Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.sudo.ws/stable.htmlVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.suse.com/security/cve/CVE-2019-19234/
af854a3a-2127-422b-91ae-364da2661108https://www.tenable.com/plugins/nessus/132985
Impacted products
Vendor Product Version
Show details on NVD website

To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2019-19234\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2019-12-19T21:15:13.823\",\"lastModified\":\"2024-11-21T04:34:23.253\",\"vulnStatus\":\"Modified\",\"cveTags\":[{\"sourceIdentifier\":\"cve@mitre.org\",\"tags\":[\"disputed\"]}],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\"},{\"lang\":\"es\",\"value\":\"** EN DISPUTA ** En Sudo hasta la versi\u00f3n 1.8.29, no se considera el hecho de que un usuario haya sido bloqueado (por ejemplo, al usar el car\u00e1cter! En el archivo de sombra en lugar de un hash de contrase\u00f1a), lo que permite que un atacante (que tiene acceso a una cuenta de sudoer Runas ALL) para suplantar a cualquier usuario bloqueado. NOTA: El responsable del software cree que este CVE no es v\u00e1lido. Deshabilitar la autenticaci\u00f3n de contrase\u00f1a local para un usuario no es lo mismo que deshabilitar todo acceso a ese usuario; el usuario a\u00fan puede iniciar sesi\u00f3n por otros medios (clave ssh, kerberos, etc.). Tanto los manuales Linux shadow (5) como passwd (1) son claros al respecto. De hecho, es un caso de uso v\u00e1lido tener cuentas locales a las que solo se puede acceder mediante sudo y que no se pueden iniciar sesi\u00f3n con una contrase\u00f1a. Sudo 1.8.30 agreg\u00f3 una configuraci\u00f3n opcional para verificar el _shell_ del usuario objetivo (\u00a1no la contrase\u00f1a cifrada!) Contra el contenido de / etc / shells, pero eso no es lo mismo que impedir el acceso a los usuarios con un hash de contrase\u00f1a no v\u00e1lido.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:P/A:N\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:sudo:sudo:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"1.8.29\",\"matchCriteriaId\":\"E313952C-D529-4DEC-A046-C7A29AFDE26C\"}]}]}],\"references\":[{\"url\":\"https://access.redhat.com/security/cve/cve-2019-19234\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6TKF36KOQUVJNBHSVJFA7BU3CCEYD2F/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY6DZ7WMDKU4ZDML6MJLDAPG42B5WVUC/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58104\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58473\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58772\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58812\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs58979\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://quickview.cloudapps.cisco.com/quickview/bug/CSCvs60748\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://security.netapp.com/advisory/ntap-20200103-0004/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://support2.windriver.com/index.php?page=cve\u0026on=view\u0026id=CVE-2019-19234\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://support2.windriver.com/index.php?page=defects\u0026on=view\u0026id=LIN1018-5505\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://support2.windriver.com/index.php?page=defects\u0026on=view\u0026id=LIN1019-3816\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.bsi.bund.de/SharedDocs/Warnmeldungen/DE/CB/2019/12/warnmeldung_cb-k20-0001.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.oracle.com/security-alerts/bulletinapr2020.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.sudo.ws/devel.html#1.8.30b2\",\"source\":\"cve@mitre.org\",\"tags\":[\"Vendor 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}


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