fkie_cve-2020-25685
Vulnerability from fkie_nvd
Published
2021-01-20 16:15
Modified
2024-11-21 05:18
Severity ?
3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. 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=1889688Issue 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=1889688Issue 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
thekelleys dnsmasq *
fedoraproject fedora 32
fedoraproject fedora 33
debian debian_linux 10.0
arista eos *
arista eos *
arista eos *
arista eos *
arista eos *


To clipboard 

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      "value": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. 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.\u0026#xa0;Al obtener una respuesta de una consulta reenviada, dnsmasq comprueba en forward.c:reply_query(), que es la consulta reenviada que coincide con la respuesta, usando solo un hash d\u00e9bil del nombre de la consulta.\u0026#xa0;Debido al hash d\u00e9bil (CRC32 cuando dnsmasq se compila sin DNSSEC, SHA-1 cuando lo es), este fallo permite a un atacante fuera de ruta encontrar varios dominios diferentes que tengan el mismo hash, reduciendo sustancialmente el n\u00famero de intentos que tendr\u00edan que realizar para falsificar una respuesta y conseguir que dnsmasq la acepte.\u0026#xa0;Esto contrasta con RFC5452, que especifica que el nombre de la consulta es uno de los atributos de una consulta que debe ser usada para hacer coincidir una respuesta.\u0026#xa0;Se puede abusar de este fallo para realizar un ataque de envenenamiento de cach\u00e9 de DNS.\u0026#xa0;Si se encadena con CVE-2020-25684, se reduce la complejidad del ataque de un ataque con \u00e9xito"
    }
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  "id": "CVE-2020-25685",
  "lastModified": "2024-11-21T05:18:27.807",
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}


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