CVE-2018-20217

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "datePublic": "2018-12-08T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. 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{}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mit:kerberos:*:*:*:*:*:*:*:*", "matchCriteriaId": "47D60B1D-E4D9-4FF8-8C98-7ACCF81D3F24", "versionEndExcluding": "5-1.17", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*", "matchCriteriaId": "C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43", "vulnerable": true}, {"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request."}, {"lang": "es", "value": "Se ha descubierto un problema de aserci\u00f3n alcanzable en el KDC en MIT Kerberos 5 (tambi\u00e9n conocido como krb5), en versiones anteriores a la 1.17. Si un atacante puede obtener un ticket krbtgt mediante un tipo de cifrado m\u00e1s antiguo (DES, Triple DES o RC4), este puede provocar el cierre inesperado de KDC realizando una petici\u00f3n S4U2Self."}], "id": "CVE-2018-20217", "lastModified": "2026-06-17T01:52:28.013", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 3.5, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:S/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-12-26T21:29:02.543", "references": [{"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html"}, {"source": "cve@mitre.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20190416-0006/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20190416-0006/"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHBA-2020:0547", "cpe": "cpe:/a:redhat:ansible_tower:3.4::el7", "package": "ansible-tower-34/ansible-tower-memcached:1.4.15-28", "product_name": "Red Hat Ansible Tower 3.4 for RHEL 7", "release_date": "2020-02-18T00:00:00Z"}, {"advisory": "RHBA-2020:0547", "cpe": "cpe:/a:redhat:ansible_tower:3.4::el7", "package": "ansible-tower-35/ansible-tower-memcached:1.4.15-28", "product_name": "Red Hat Ansible Tower 3.4 for RHEL 7", "release_date": "2020-02-18T00:00:00Z"}, {"advisory": "RHBA-2020:0547", "cpe": "cpe:/a:redhat:ansible_tower:3.4::el7", "package": "ansible-tower-37/ansible-tower-memcached-rhel7:1.4.15-28", "product_name": "Red Hat Ansible Tower 3.4 for RHEL 7", "release_date": "2020-02-18T00:00:00Z"}, {"advisory": "RHBA-2019:2599", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "krb5-0:1.15.1-37.el7_7.2", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2019-09-04T00:00:00Z"}], "bugzilla": {"description": "krb5: Reachable assertion in the KDC using S4U2Self requests", "id": "1665296", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1665296"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-617", "details": ["A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request."], "name": "CVE-2018-20217", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "krb5", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "package_name": "krb5", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "krb5", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Out of support scope", "package_name": "krb5", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:6", "fix_state": "Out of support scope", "package_name": "krb5", "product_name": "Red Hat JBoss Enterprise Application Platform 6"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:2", "fix_state": "Out of support scope", "package_name": "krb5", "product_name": "Red Hat JBoss Enterprise Web Server 2"}], "public_date": "2018-12-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-20217\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-20217"], "threat_severity": "Moderate"}

{}