{"id": "CVE-2021-25217", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 3.3, "accessVector": "ADJACENT_NETWORK", "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 6.5, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "security-officer@isc.org", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 2.8}, {"type": "Secondary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 2.8}]}, "published": "2021-05-26T22:15:07.947", "references": [{"url": "http://www.openwall.com/lists/oss-security/2021/05/26/6", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "source": "security-officer@isc.org"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf", "tags": ["Patch", "Third Party Advisory"], "source": "security-officer@isc.org"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf", "tags": ["Patch", "Third Party Advisory"], "source": "security-officer@isc.org"}, {"url": "https://kb.isc.org/docs/cve-2021-25217", "tags": ["Exploit", "Vendor Advisory"], "source": "security-officer@isc.org"}, {"url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html", "tags": ["Mailing List", "Third Party Advisory"], "source": "security-officer@isc.org"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/", "source": "security-officer@isc.org"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/", "source": "security-officer@isc.org"}, {"url": "https://security.gentoo.org/glsa/202305-22", "source": "security-officer@isc.org"}, {"url": "https://security.netapp.com/advisory/ntap-20220325-0011/", "tags": ["Third Party Advisory"], "source": "security-officer@isc.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-119"}]}], "descriptions": [{"lang": "en", "value": "In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted."}, {"lang": "es", "value": "En ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16, ISC DHCP versiones 4.4.0 anteriores a 4.4.2 (Otras ramas de ISC DHCP (es decir, versiones de la serie 4.0.x o inferiores y versiones de la serie 4.3.x) est\u00e1n m\u00e1s all\u00e1 de su End-of-Life (EOL) y ya no son soportadas por ISC. El resultado de encontrar el fallo mientras se lee un contrato de arrendamiento que lo desencadena var\u00eda, seg\u00fan: el componente afectado (es decir, dhclient o dhcpd) si el paquete se construy\u00f3 como un binario de 32 o 64 bits si fue usado el flag del compilador -fstack-protection-strong al compilar En dhclient, ISC no ha reproducido con \u00e9xito el error en un sistema de 64 bits. Sin embargo, en un sistema de 32 bits es posible causar a dhclient bloquearse cuando leen un contrato de arrendamiento inapropiado, lo que podr\u00eda causar problemas de conectividad de red para un sistema afectado debido a la ausencia de un proceso de cliente DHCP en ejecuci\u00f3n. En dhcpd, cuando se ejecuta en modo DHCPv4 o DHCPv6: si el binario del servidor dhcpd fue construido para una arquitectura de 32 bits Y se especific\u00f3 el flag -fstack-protection-strong al compilador, dhcpd puede salir mientras analiza un archivo de arrendamiento que contiene un arrendamiento objetable, resultando en la falta de servicio a los clientes. Si el binario del servidor dhcpd fue construido para una arquitectura de 64 bits O si la flag -fstack-protection-strong del compilador NO fue especificado, el bloqueo no ocurrir\u00e1, pero es posible que el contrato de arrendamiento ofensivo y el que le sigue sean borrados inapropiadamente"}], "lastModified": "2023-11-07T03:31:24.893", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:isc:dhcp:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "106A3E98-3D4B-47F7-80AD-49A47A7B20D6", "versionEndIncluding": "4.4.2", "versionStartIncluding": "4.4.0"}, {"criteria": "cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FBAABA4E-0D34-4644-AC26-E272CEE6C361"}, {"criteria": "cpe:2.3:a:isc:dhcp:4.1-esv:r10:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "179443DC-4B6A-408A-8BE5-B3E72188F43E"}, {"criteria": "cpe:2.3:a:isc:dhcp:4.1-esv:r10_b1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": 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