CVE-2018-1113

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This violates security assumptions made by pam_shells and some daemons which allow access based on a user's shell being listed in /etc/shells. Under some circumstances, users which had their shell changed to /sbin/nologin could still access the system."}, {"lang": "es", "value": "setup en versiones anteriores a la 2.11.4-1.fc28 en Fedora y Red Hat Enterprise Linux a\u00f1ad\u00eda /sbin/nologin y /usr/sbin/nologin a /etc/shells. Esto viola las asunciones de seguridad realizadas por pam_shells y algunos demonios, lo que permite el acceso en base a que el shell de un usuario se lista en /etc/shells. En algunas circunstancias, los usuarios a los que se les haya cambiado el shell a /sbin/nologin podr\u00edan seguir siendo capaces de acceder al sistema."}], "id": "CVE-2018-1113", "lastModified": "2026-06-17T01:50:30.437", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.6, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L", "version": "3.0"}, "exploitabilityScore": 1.3, "impactScore": 3.4, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "version": "3.0"}, "exploitabilityScore": 1.8, "impactScore": 3.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-07-03T01:29:00.690", "references": [{"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHBA-2019:0327"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2018:3249"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1113"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHBA-2019:0327"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2018:3249"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1113"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-732"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2018:3249", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "setup-0:2.8.71-10.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-10-30T00:00:00Z"}], "bugzilla": {"description": "setup: nologin listed in /etc/shells violates security expectations", "id": "1571094", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1571094"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L", "status": "verified"}, "cwe": "CWE-285", "details": ["setup before version 2.11.4-1.fc28 in Fedora and Red Hat Enterprise Linux added /sbin/nologin and /usr/sbin/nologin to /etc/shells. This violates security assumptions made by pam_shells and some daemons which allow access based on a user's shell being listed in /etc/shells. Under some circumstances, users which had their shell changed to /sbin/nologin could still access the system.", "Setup in Fedora and Red Hat Enterprise Linux added /sbin/nologin and /usr/sbin/nologin to /etc/shells. This violates security assumptions made by pam_shells and some daemons which allow access based on a user's shell being listed in /etc/shells. Under some circumstances, users which had their shell changed to /sbin/nologin could still access the system."], "name": "CVE-2018-1113", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "setup", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "setup", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "setup", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2018-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-1113\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-1113"], "statement": "Preventing a user from accessing the system without deleting their account is not a simple matter. For utmost security, the account should be deleted. Short of this, we recommend a three-pronged approach:\n* change the user's login shell to a harmless command that is not in \"/etc/shells\" (for example \"/bin/false\") to prevent commands being run on their behalf\n* lock the user's password with \"usermod -L\" to prevent authentication with pam services\n* prevent access to the user's home directory with \"chmod 0\" or \"chown root\" and \"chmod 700\" to prevent authentication with ssh keys etc", "threat_severity": "Low"}

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