cve-2020-25686
Vulnerability from cvelistv5
Published
2021-01-20 16:47
Modified
2024-08-04 15:40
Severity ?
Summary
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.
References
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1890125Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
secalert@redhat.comhttps://security.gentoo.org/glsa/202101-17Third Party Advisory
secalert@redhat.comhttps://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61Third Party Advisory
secalert@redhat.comhttps://www.debian.org/security/2021/dsa-4844Third Party Advisory
secalert@redhat.comhttps://www.jsof-tech.com/disclosures/dnspooq/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1890125Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202101-17Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4844Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.jsof-tech.com/disclosures/dnspooq/Third Party Advisory
Impacted products
Vendor Product Version
n/a dnsmasq Version: dnsmasq 2.83
Show details on NVD website

To clipboard 

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datos\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N\",\"baseScore\":3.7,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":1.4}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:N/I:P/A:N\",\"baseScore\":4.3,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"secalert@redhat.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-358\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-290\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"2.83\",\"matchCriteriaId\":\"F38115DF-0F5C-442D-83D4-1125AAB4E2B7\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"36D96259-24BD-44E2-96D9-78CE1D41F956\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E460AA51-FCDA-46B9-AE97-E6676AA5E194\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.21\",\"versionEndExcluding\":\"4.21.14m\",\"matchCriteriaId\":\"2E5C0DA1-5E51-40F1-82FE-CF7E391C07E4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.22\",\"versionEndExcluding\":\"4.22.9m\",\"matchCriteriaId\":\"206E795F-BFE9-4AB9-A35F-60AC911F38E4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.23\",\"versionEndExcluding\":\"4.23.7m\",\"matchCriteriaId\":\"6FA15712-F804-4060-99C0-7370D6111B83\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.24\",\"versionEndExcluding\":\"4.24.5m\",\"matchCriteriaId\":\"21A321F5-CB56-4258-BB30-6753EECB89DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.25\",\"versionEndExcluding\":\"4.25.2f\",\"matchCriteriaId\":\"9445AF76-6AE4-46A6-A470-979ADBB19EE2\"}]}]}],\"references\":[{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=1890125\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"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\",\"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\":\"secalert@redhat.com\",\"tags\":[\"Third Party 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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\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.