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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 obtener una respuesta de una consulta reenviada, dnsmasq comprueba en forward.c:reply_query() si la direcci\u00f3n y puerto de destino de la respuesta es utilizado por las consultas reenviadas pendientes. Sin embargo, no usa la direcci\u00f3n y puerto para recuperar la consulta reenviada exacta, lo que reduce sustancialmente la cantidad de intentos que un atacante en la red tendr\u00eda que realizar para falsificar una respuesta y lograr que dnsmasq la acepte. Este problema contrasta con RFC5452, que especifica los atributos de una consulta que deben ser usados para hacer coincidir una respuesta. Este fallo permite a un atacante realizar un ataque de envenenamiento de cach\u00e9 de DNS. Si est\u00e1 encadenado con CVE-2020-25685 o CVE-2020-25686, se reduce la complejidad del ataque de un ataque con \u00e9xito. La mayor amenaza 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{"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: loose address/port check in reply_query() makes forging replies easier for an off-path attacker", "id": "1889686", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1889686"}, "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-358", "details": ["A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, 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 getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, 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-2020-25684", "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-2020-25684\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-25684\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"}