CVE-2020-8617 (GCVE-0-2020-8617)

Vulnerability from cvelistv5 – Published: 2020-05-19 14:05 – Updated: 2024-09-16 20:26
VLAI?
Summary
Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • An error in BIND code which checks the validity of messages containing TSIG resource records can be exploited by an attacker to trigger an assertion failure in tsig.c, resulting in denial of service to clients. BIND 9.0.0 -> 9.11.18, 9.12.0 -> 9.12.4-P2, 9.14.0 -> 9.14.11, 9.16.0 -> 9.16.2, and releases 9.17.0 -> 9.17.1 of the 9.17 experimental development branch. All releases in the obsolete 9.13 and 9.15 development branches. All releases of BIND Supported Preview Edition from 9.9.3-S1 -> 9.11.18-S1.
Assigner
isc
References
Impacted products
Vendor Product Version
ISC BIND9 Affected: 9.0.0 -> 9.11.18, 9.12.0 -> 9.12.4-P2, 9.14.0 -> 9.14.11, 9.16.0 -> 9.16.2, and releases 9.17.0 -> 9.17.1 of the 9.17 experimental development branch. All releases in the obsolete 9.13 and 9.15 development branches. All releases of BIND Supported Preview Edition from 9.9.3-S1 -> 9.11.18-S1
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.\"}, {\"lang\": \"es\", \"value\": \"Al usar un mensaje especialmente dise\\u00f1ado, un atacante puede causar que un servidor BIND alcance un estado inconsistente si el atacante conoce (o adivina con \\u00e9xito) el nombre de una clave TSIG utilizada por el servidor. Dado que BIND, por defecto, configura una clave de sesi\\u00f3n local incluso en servidores cuya configuraci\\u00f3n no la usa, casi todos los servidores BIND actuales son vulnerables. En los lanzamientos de BIND que datan de marzo de 2018 y posteriores, una comprobaci\\u00f3n de afirmaci\\u00f3n en el archivo tsig.c detecta este estado inconsistente y se cierra deliberadamente. Antes de la introducci\\u00f3n de la comprobaci\\u00f3n, el servidor continuar\\u00eda funcionando en un estado inconsistente, con resultados potencialmente da\\u00f1inos.\"}]",
      "id": "CVE-2020-8617",
      "lastModified": "2024-11-21T05:39:07.990",
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      "published": "2020-05-19T14:15:11.987",
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  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.