CVE-2020-25686

{"id": "CVE-2020-25686", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.2}]}, "published": "2021-01-20T17:15:13.000", "references": [{"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1890125", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/", "source": "secalert@redhat.com"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/", "source": "secalert@redhat.com"}, {"url": "https://security.gentoo.org/glsa/202101-17", "tags": ["Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61", "tags": ["Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://www.debian.org/security/2021/dsa-4844", "tags": ["Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://www.jsof-tech.com/disclosures/dnspooq/", "tags": ["Third Party Advisory"], "source": "secalert@redhat.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-358"}]}, {"type": "Secondary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-290"}]}], "descriptions": [{"lang": "en", "value": "A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en dnsmasq versiones anteriores a 2.83. Al recibir una consulta, dnsmasq no comprueba si existe una petici\u00f3n pendiente existente para el mismo nombre y reenv\u00eda una nueva petici\u00f3n. Por defecto, se puede enviar un m\u00e1ximo de 150 consultas pendientes a los servidores aguas arriba, por lo que puede haber como m\u00e1ximo 150 consultas para el mismo nombre. Este fallo permite a un atacante fuera de ruta en la red reduzca sustancialmente el n\u00famero de intentos que tendr\u00eda que realizar para falsificar una respuesta y hacer que dnsmasq la acepte. Este problema se menciona en la secci\u00f3n \"Birthday Attacks\" de RFC5452. Si se encadenaba con CVE-2020-25684, se reduce la complejidad del ataque de un ataque con \u00e9xito. La mayor amenaza de esta vulnerabilidad es la integridad de los datos"}], "lastModified": "2023-11-07T03:20:22.280", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F38115DF-0F5C-442D-83D4-1125AAB4E2B7", "versionEndExcluding": "2.83"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "36D96259-24BD-44E2-96D9-78CE1D41F956"}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2E5C0DA1-5E51-40F1-82FE-CF7E391C07E4", "versionEndExcluding": "4.21.14m", "versionStartIncluding": "4.21"}, {"criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "206E795F-BFE9-4AB9-A35F-60AC911F38E4", "versionEndExcluding": "4.22.9m", "versionStartIncluding": "4.22"}, {"criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6FA15712-F804-4060-99C0-7370D6111B83", "versionEndExcluding": "4.23.7m", "versionStartIncluding": "4.23"}, {"criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "21A321F5-CB56-4258-BB30-6753EECB89DD", "versionEndExcluding": "4.24.5m", "versionStartIncluding": "4.24"}, {"criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9445AF76-6AE4-46A6-A470-979ADBB19EE2", "versionEndExcluding": "4.25.2f", "versionStartIncluding": "4.25"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}