rhsa-2020_3471
Vulnerability from csaf_redhat
Published
2020-08-18 09:15
Modified
2024-11-22 15:09
Summary
Red Hat Security Advisory: bind security update

Notes

Topic
An update for bind is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly. Security Fix(es): * bind: BIND does not sufficiently limit the number of fetches performed when processing referrals (CVE-2020-8616) * bind: A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c (CVE-2020-8617) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "ISC"
          ]
        },
        {
          "names": [
            "Herzliya)"
          ],
          "summary": "Acknowledged by upstream."
        },
        {
          "names": [
            "Lior Shafir and Yehuda Afek"
          ],
          "organization": "Tel Aviv University",
          "summary": "Acknowledged by upstream."
        },
        {
          "names": [
            "Anat Bremler-Barr"
          ],
          "organization": "Interdisciplinary Center (IDC",
          "summary": "Acknowledged by upstream."
        }
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      "cve": "CVE-2020-8616",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "discovery_date": "2020-05-15T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "1836118"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in BIND, where it does not sufficiently limit the number of fetches that can be performed while processing a referral response. This flaw allows an attacker to cause a denial of service attack. The attacker can also exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "bind: BIND does not sufficiently limit the number of fetches performed when processing referrals",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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        },
        {
          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2020-8616"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-8616",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8616"
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          "category": "external",
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          "category": "external",
          "summary": "https://www.theregister.co.uk/2020/05/21/nxnaattack_bug_disclosed/",
          "url": "https://www.theregister.co.uk/2020/05/21/nxnaattack_bug_disclosed/"
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "bind: BIND does not sufficiently limit the number of fetches performed when processing referrals"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "ISC"
          ]
        },
        {
          "names": [
            "Tobias Klein"
          ],
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2020-8617",
      "cwe": {
        "id": "CWE-617",
        "name": "Reachable Assertion"
      },
      "discovery_date": "2020-05-15T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1836124"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An assertion failure was found in BIND, which checks the validity of messages containing TSIG resource records. This flaw allows an attacker that knows or successfully guesses the name of the TSIG key used by the server to use a specially-crafted message, potentially causing a BIND server to reach an inconsistent state or cause a denial of service. A majority of BIND servers have an internally-generated TSIG session key whose name is trivially guessable, and that key exposes the vulnerability unless specifically disabled.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "bind: A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Upstream has released additional information about this flaw. Details available at: https://kb.isc.org/docs/cve-2020-8617-faq-and-supplemental-information",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "category": "external",
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          "date": "2020-08-18T09:15:39+00:00",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "bind: A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c"
    }
  ]
}


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