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CVE-2023-2828

Full vulnerability record from the local CVENow database.

Description

Every `named` instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the `max-cache-size` statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit. It has been discovered that the effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size` limit to be significantly exceeded. This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.

Severity
HIGH
CVSS score
7.5 (v3.1)
Vulnerability status
Modified
Source identifier
[email protected]
Published
2023-06-21 17:15:47.703000
Last modified
2026-10-24 19:10:00.127000
View original CVE JSON 
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  "id": "CVE-2023-2828",
  "sourceIdentifier": "[email protected]",
  "published": "2023-06-21T17:15:47.703",
  "lastModified": "2026-10-24T19:10:00.127",
  "vulnStatus": "Modified",
  "cveTags": [],
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      "lang": "en",
      "value": "Every `named` instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the `max-cache-size` statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit.\n\nIt has been discovered that the effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size` limit to be significantly exceeded.\nThis issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1."
    },
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      "value": "Cada instancia 'named' configurada para funcionar como un resolvedor recursivo mantiene una base de datos de caché que contiene las respuestas a las consultas que ha enviado recientemente a servidores autoritativos. El límite de tamaño para esa base de datos de caché se puede configurar usando la instrucción 'max-cache-size' en el archivo de configuración; por defecto es el 90% de la cantidad total de memoria disponible en el host. Cuando el tamaño de la caché alcanza 7/8 del límite configurado, un algoritmo de limpieza de caché comienza a eliminar RRsets caducados y/o menos recientemente utilizados de la caché, para mantener el uso de memoria por debajo del límite configurado.\n\nSe ha descubierto que la efectividad del algoritmo de limpieza de caché utilizado en 'named' puede verse gravemente disminuida al consultar el resolvedor para RRsets específicos en un cierto orden, permitiendo efectivamente que el límite configurado de 'max-cache-size' sea excedido significativamente.\nEste problema afecta a las versiones de BIND 9 9.11.0 a 9.16.41, 9.18.0 a 9.18.15, 9.19.0 a 9.19.13, 9.11.3-S1 a 9.16.41-S1, y 9.18.11-S1 a 9.18.15-S1."
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