GSD-2020-8617

Vulnerability from gsd - Updated: 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
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{
  "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"
    }
  },
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        "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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            "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": {
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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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        }
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                "lang": "eng",
                "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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            "refsource": "CONFIRM",
            "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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            "url": "http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html"
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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."
        }
      ]
    },
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        "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"
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          "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 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.