CVE-2018-5743

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El n\u00famero de conexiones permitidas es un par\u00e1metro sintonizable que, si no se encuentra configurado, por defecto es un valor conservador para la mayor\u00eda de los servidores. Desafortunadamente, el c\u00f3digo que estaba destinado a limitar el n\u00famero de conexiones simult\u00e1neas conten\u00eda un error que podr\u00eda ser explotado para aumentar el n\u00famero de conexiones simult\u00e1neas m\u00e1s all\u00e1 de este l\u00edmite. Versiones afectadas: BIND 9.9.0 hasta 9.10.8-P1, 9.11.0 hasta 9.11.6, 9.12.0 hasta 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versiones 9.9.3-S1 hasta 9.11.5-S3 y 9.11.5-S5. Las versiones 9.13.0 hasta 9.13.7 de la rama de desarrollo 9.13 tambi\u00e9n est\u00e1n afectadas. Las versiones anteriores a BIND 9.9.0 no han sido evaluadas para la vulnerabilidad de CVE-2018-5743."}], "id": "CVE-2018-5743", "lastModified": "2026-06-17T02:00:42.250", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-officer@isc.org", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2019-10-09T16:15:13.763", "references": [{"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://kb.isc.org/docs/cve-2018-5743"}, {"source": "security-officer@isc.org", "url": "https://support.f5.com/csp/article/K74009656?utm_source=f5support&amp%3Butm_medium=RSS"}, {"source": "security-officer@isc.org", "url": "https://www.synology.com/security/advisory/Synology_SA_19_20"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://kb.isc.org/docs/cve-2018-5743"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://support.f5.com/csp/article/K74009656?utm_source=f5support&amp%3Butm_medium=RSS"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.synology.com/security/advisory/Synology_SA_19_20"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank ISC for reporting this issue. Upstream acknowledges AT&T as the original reporter.", "affected_release": [{"advisory": "RHSA-2019:1492", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "bind-32:9.8.2-0.68.rc1.el6_10.3", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2019-06-17T00:00:00Z"}, {"advisory": "RHSA-2019:1294", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "bind-32:9.9.4-74.el7_6.1", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2019-05-29T00:00:00Z"}, {"advisory": "RHSA-2019:2698", "cpe": "cpe:/o:redhat:rhel_eus:7.4", "package": "bind-32:9.9.4-51.el7_4.3", "product_name": "Red Hat Enterprise Linux 7.4 Extended Update Support", "release_date": "2019-09-12T00:00:00Z"}, {"advisory": "RHSA-2019:2977", "cpe": "cpe:/o:redhat:rhel_eus:7.5", "package": "bind-32:9.9.4-61.el7_5.2", "product_name": "Red Hat Enterprise Linux 7.5 Extended Update Support", "release_date": "2019-10-08T00:00:00Z"}, {"advisory": "RHSA-2019:1145", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "bind-32:9.11.4-17.P2.el8_0", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2019-05-13T00:00:00Z"}, {"advisory": "RHSA-2019:1145", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "bind-32:9.11.4-17.P2.el8_0", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2019-05-13T00:00:00Z"}], "bugzilla": {"description": "bind: Limiting simultaneous TCP clients is ineffective", "id": "1702541", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1702541"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.6", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "status": "verified"}, "details": ["By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.", "A flaw was found in the way bind implemented tunable which limited simultaneous TCP client connections. A remote attacker could use this flaw to exhaust the pool of file descriptors available to named, potentially affecting network connections and the management of files such as log files or zone journal files. In cases where the named process is not limited by OS-enforced per-process limits, this could additionally potentially lead to exhaustion of all available free file descriptors on that system."], "name": "CVE-2018-5743", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "bind97", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2019-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-5743\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-5743\nhttps://kb.isc.org/docs/cve-2018-5743"], "statement": "This bind flaw can be exploited by a remote attacker (AV:N) by opening large number of simultaneous TCP client connections with the server. No special exploit code is required apart from the ability to open large number of TCP connections simultaneously either from one attacker machine or via some distributed attacker network (AC:L and PR:L). No user interaction is required from the server side (UI:N). The attacker can cause denial of service (A:H) by exhausting the file descriptor pool which named has access to. Also in cases where named process is not limited by OS-enforced per-process limits, this could cause exhaustion of available free file descriptors on the system running the named server causing denial of service for other processes running on that machine (S:C).", "threat_severity": "Important"}

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