gsd-2020-8617
Vulnerability from gsd
Modified
2023-12-13 01:21
Details
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.
Aliases
Aliases
CVE-2020-8617


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-8617",
    "description": "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.",
    "id": "GSD-2020-8617",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-8617.html",
      "https://www.debian.org/security/2020/dsa-4689",
      "https://access.redhat.com/errata/RHSA-2020:3475",
      "https://access.redhat.com/errata/RHSA-2020:3471",
      "https://access.redhat.com/errata/RHSA-2020:3470",
      "https://access.redhat.com/errata/RHSA-2020:3433",
      "https://access.redhat.com/errata/RHSA-2020:3379",
      "https://access.redhat.com/errata/RHSA-2020:3378",
      "https://access.redhat.com/errata/RHSA-2020:2893",
      "https://access.redhat.com/errata/RHSA-2020:2404",
      "https://access.redhat.com/errata/RHSA-2020:2383",
      "https://access.redhat.com/errata/RHSA-2020:2345",
      "https://access.redhat.com/errata/RHSA-2020:2344",
      "https://access.redhat.com/errata/RHSA-2020:2338",
      "https://ubuntu.com/security/CVE-2020-8617",
      "https://advisories.mageia.org/CVE-2020-8617.html",
      "https://security.archlinux.org/CVE-2020-8617",
      "https://alas.aws.amazon.com/cve/html/CVE-2020-8617.html",
      "https://linux.oracle.com/cve/CVE-2020-8617.html",
      "https://packetstormsecurity.com/files/cve/CVE-2020-8617"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-8617"
      ],
      "details": "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.",
      "id": "GSD-2020-8617",
      "modified": "2023-12-13T01:21:54.494552Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "security-officer@isc.org",
        "DATE_PUBLIC": "2020-05-19T08:59:49.000Z",
        "ID": "CVE-2020-8617",
        "STATE": "PUBLIC",
        "TITLE": "A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "BIND9",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "9.0.0 -\u003e 9.11.18, 9.12.0 -\u003e 9.12.4-P2, 9.14.0 -\u003e 9.14.11, 9.16.0 -\u003e 9.16.2, and releases 9.17.0 -\u003e 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 -\u003e 9.11.18-S1"
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                    }
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            "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."
          }
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      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
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          "attackComplexity": "LOW",
          "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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                "value": "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 -\u003e 9.11.18, 9.12.0 -\u003e 9.12.4-P2, 9.14.0 -\u003e 9.14.11, 9.16.0 -\u003e 9.16.2, and releases 9.17.0 -\u003e 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 -\u003e 9.11.18-S1."
              }
            ]
          }
        ]
      },
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            "url": "https://kb.isc.org/docs/cve-2020-8617"
          },
          {
            "name": "[oss-security] 20200519 Two vulnerabilities disclosed in BIND (CVE-2020-8616 and CVE-2020-8617)",
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            "url": "http://www.openwall.com/lists/oss-security/2020/05/19/4"
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          },
          {
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            "refsource": "MISC",
            "url": "http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html"
          },
          {
            "name": "USN-4365-2",
            "refsource": "UBUNTU",
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            "refsource": "SUSE",
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html"
          }
        ]
      },
      "solution": [
        {
          "lang": "eng",
          "value": "Upgrade to the patched release most closely related to your current version of BIND:\n\n    BIND 9.11.19\n    BIND 9.14.12\n    BIND 9.16.3\n\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n\n    BIND 9.11.19-S1"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "work_around": [
        {
          "lang": "eng",
          "value": "None known."
        }
      ]
    },
    "nvd.nist.gov": {
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          "ID": "CVE-2020-8617"
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            }
          ]
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      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 4.3,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-09-09T17:47Z",
      "publishedDate": "2020-05-19T14:15Z"
    }
  }
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.