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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"}], "id": "CVE-2020-25686", "lastModified": "2025-11-04T20:15:57.490", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-01-20T17:15:13.000", "references": [{"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1890125"}, {"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", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202101-17"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4844"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://www.jsof-tech.com/disclosures/dnspooq/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1890125"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202101-17"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4844"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.jsof-tech.com/disclosures/dnspooq/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/434904"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-358"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-290"}], "source": "nvd@nist.gov", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Moshe Kol (JSOF) and Shlomi Oberman (JSOF) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:0153", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "dnsmasq-0:2.76-16.el7_9.1", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0240", "cpe": "cpe:/o:redhat:rhel_aus:7.2", "package": "dnsmasq-0:2.66-14.el7_2.3", "product_name": "Red Hat Enterprise Linux 7.2 Advanced Update Support", "release_date": "2021-01-25T00:00:00Z"}, {"advisory": "RHSA-2021:0245", "cpe": "cpe:/o:redhat:rhel_aus:7.3", "package": "dnsmasq-0:2.66-21.el7_3.3", "product_name": "Red Hat Enterprise Linux 7.3 Advanced Update Support", "release_date": "2021-01-25T00:00:00Z"}, {"advisory": "RHSA-2021:0156", "cpe": "cpe:/o:redhat:rhel_aus:7.4", "package": "dnsmasq-0:2.76-2.el7_4.3", "product_name": "Red Hat Enterprise Linux 7.4 Advanced Update Support", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0156", "cpe": "cpe:/o:redhat:rhel_tus:7.4", "package": "dnsmasq-0:2.76-2.el7_4.3", "product_name": "Red Hat Enterprise Linux 7.4 Telco Extended Update Support", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0156", "cpe": "cpe:/o:redhat:rhel_e4s:7.4", "package": "dnsmasq-0:2.76-2.el7_4.3", "product_name": "Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0155", "cpe": "cpe:/o:redhat:rhel_eus:7.6", "package": "dnsmasq-0:2.76-7.el7_6.2", "product_name": "Red Hat Enterprise Linux 7.6 Extended Update Support", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0154", "cpe": "cpe:/o:redhat:rhel_eus:7.7", "package": "dnsmasq-0:2.76-10.el7_7.2", "product_name": "Red Hat Enterprise Linux 7.7 Extended Update Support", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0150", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "dnsmasq-0:2.79-13.el8_3.1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0152", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "dnsmasq-0:2.79-6.el8_1.1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0151", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "dnsmasq-0:2.79-11.el8_2.2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-01-19T00:00:00Z"}, {"advisory": "RHSA-2021:0395", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.3.13-20210127.0.el7_9", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2021-02-03T00:00:00Z"}, {"advisory": "RHSA-2021:0401", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "redhat-virtualization-host-0:4.4.4-20210201.0.el8_3", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2021-02-03T00:00:00Z"}], "bugzilla": {"description": "dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker", "id": "1890125", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1890125"}, "csaw": true, "cvss3": {"cvss3_base_score": "4.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N", "status": "verified"}, "cwe": "CWE-290", "details": ["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.", "A flaw was found in dnsmasq. 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."], "mitigation": {"lang": "en:us", "value": "The impact of this flaw can be reduced by disabling the dnsmasq cache by adding `--cache-size=0` when calling dnsmasq or by adding a line with `cache-size=0` to the dnsmasq configuration file (/etc/dnsmasq.conf by default). \nWhen using Red Hat Enterprise Linux 8.3 with libvirt through a virt:rhel module, use `virsh net-edit <network-name>` and reference https://libvirt.org/formatnetwork.html#elementsNamespaces to add the suggested option `cache-size=0`. \nThere is no way to customize the dnsmasq configuration generated by libvirt, when using versions of Red Hat Enterprise Linux prior to version 8.3. If dnsmasq is being run through NetworkManager, create a new file in /etc/NetworkManager/dnsmasq.d/ and add `cache-size=0` to it.\nIn all cases, by disabling the cache, you may experience a performance loss in your environment due to all DNS queries being forwarded to the upstream servers. Please evaluate if the mitigation is appropriate for the system\u2019s environment before applying."}, "name": "CVE-2020-25686", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openstack:10", "fix_state": "Not affected", "package_name": "dnsmasq", "product_name": "Red Hat OpenStack Platform 10 (Newton)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Not affected", "package_name": "dnsmasq", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}], "public_date": "2021-01-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-25686\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-25686\nhttps://www.jsof-tech.com/disclosures/dnspooq/"], "statement": "Dnsmasq may be run by libvirt and/or NetworkManager. libvirt uses dnsmasq by default to provide DNS service to its guests. NetworkManager may be configured to use dnsmasq to provide DNS service to the system, if a line `dns=dnsmasq` is present in the `[main]` section of the configuration file /etc/NetworkManager/NetworkManager.conf.\nIn Red Hat OpenStack Platform (RHOSP) and Red Hat Virtualization (RHV), the dnsmasq package is provided by the underlying Red Hat Enterprise Linux (RHEL) product. RHOSP and RHV are therefore indirectly affected, so please ensure that the underlying RHEL dnsmasq package is updated.", "threat_severity": "Moderate"}

{}