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CVE-2020-25684

CVE-2020-25684

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

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.

CVSS 3.7 · Baja · EPSS 4,2% · Corrección disponible

Publicación
Actualización

Pila tecnológica: system

Productos y versiones afectados

  • dnsmasq

    Versiones
    • dnsmasq 2.83: Afectada

    Sin corrección publicada

  • dnsmasq Debian:12

    Intervalos de versiones afectados
    • ECOSYSTEM: < 2.83-1

    Actualiza a 2.83-1

  • dnsmasq Debian:13

    Intervalos de versiones afectados
    • ECOSYSTEM: < 2.83-1

    Actualiza a 2.83-1

  • dnsmasq Debian:14

    Intervalos de versiones afectados
    • ECOSYSTEM: < 2.83-1

    Actualiza a 2.83-1

  • dnsmasq Ubuntu:Pro:14.04:LTS

    Versiones
    • 2.66-4ubuntu1
    • 2.67-1
    • 2.68-1
    • 2.68-1ubuntu0.1
    • 2.68-1ubuntu0.2
    • 2.68-1ubuntu0.2+esm1
    • 2.68-1ubuntu0.2+esm2
    • 2.68-1ubuntu0.2+esm3
    • 2.68-1ubuntu0.2+esm5
    • 2.68-1ubuntu0.2+esm6
    Intervalos de versiones afectados
    • ECOSYSTEM: (−∞, +∞)

    Sin corrección publicada

  • dnsmasq Ubuntu:16.04:LTS

    Versiones
    • 2.75-1
    • 2.75-1ubuntu0.16.04.1
    • 2.75-1ubuntu0.16.04.2
    • 2.75-1ubuntu0.16.04.3
    • 2.75-1ubuntu0.16.04.4
    • 2.75-1ubuntu0.16.04.5
    Intervalos de versiones afectados
    • ECOSYSTEM: < 2.75-1ubuntu0.16.04.7

    Actualiza a 2.75-1ubuntu0.16.04.7

  • dnsmasq Ubuntu:18.04:LTS

    Versiones
    • 2.78-1
    • 2.78-3
    • 2.79-1
    Intervalos de versiones afectados
    • ECOSYSTEM: < 2.79-1ubuntu0.2

    Actualiza a 2.79-1ubuntu0.2

  • dnsmasq Ubuntu:20.04:LTS

    Versiones
    • 2.80-1ubuntu2
    • 2.80-1ubuntu4
    • 2.80-1.1ubuntu1
    Intervalos de versiones afectados
    • ECOSYSTEM: < 2.80-1.1ubuntu1.2

    Actualiza a 2.80-1.1ubuntu1.2

Fuentes originales

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