CVE-2020-8616 (GCVE-0-2020-8616)

Vulnerability from cvelistv5 – Published: 2020-05-19 14:05 – Updated: 2024-09-16 23:55
VLAI
Title
BIND does not sufficiently limit the number of fetches performed when processing referrals
Summary
A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
  • In order for a server performing recursion to locate records in the DNS graph it must be capable of processing referrals, such as those received when it attempts to query an authoritative server for a record which is delegated elsewhere. In its original design BIND (as well as other nameservers) does not sufficiently limit the number of fetches which may be performed while processing a referral response. 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
URL Tags
https://kb.isc.org/docs/cve-2020-8616 x_refsource_CONFIRM
http://www.nxnsattack.com x_refsource_MISC
http://www.openwall.com/lists/oss-security/2020/05/19/4 mailing-listx_refsource_MLIST
https://www.debian.org/security/2020/dsa-4689 vendor-advisoryx_refsource_DEBIAN
https://security.netapp.com/advisory/ntap-2020052… x_refsource_CONFIRM
https://usn.ubuntu.com/4365-2/ vendor-advisoryx_refsource_UBUNTU
https://www.synology.com/security/advisory/Synolo… x_refsource_CONFIRM
https://usn.ubuntu.com/4365-1/ vendor-advisoryx_refsource_UBUNTU
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
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
Create a notification for this product.
Date Public
2020-05-19 00:00
Credits
ISC would like to thank Lior Shafir and Yehuda Afek of Tel Aviv University and Anat Bremler-Barr of Interdisciplinary Center (IDC) Herzliya for discovering and reporting this issue.
Show details on NVD website
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.\"}, {\"lang\": \"es\", \"value\": \"Un actor malicioso que explota intencionalmente esta falta de limitaci\\u00f3n efectiva en el n\\u00famero de recuperaciones realizadas cuando se procesan referencias puede, mediante el uso de referencias especialmente dise\\u00f1adas, causar que un servidor recurrente emita una gran cantidad de recuperaciones en un intento de procesar la referencia. Esto tiene al menos dos efectos potenciales: el rendimiento del servidor recurrente puede estar potencialmente afectado por el trabajo adicional requerido para realizar estas recuperaciones, y el atacante puede explotar este comportamiento para utilizar el servidor recurrente como un reflector en un ataque de reflexi\\u00f3n con un alto factor de amplificaci\\u00f3n\"}]",
      "id": "CVE-2020-8616",
      "lastModified": "2024-11-21T05:39:07.857",
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      "published": "2020-05-19T14:15:11.877",
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      "sourceIdentifier": "security-officer@isc.org",
      "vulnStatus": "Modified",
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Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://security.netapp.com/advisory/ntap-20200522-0002/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://usn.ubuntu.com/4365-1/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://usn.ubuntu.com/4365-2/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.debian.org/security/2020/dsa-4689\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.synology.com/security/advisory/Synology_SA_20_12\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.