gsd-2020-8625
Vulnerability from gsd
Modified
2023-12-13 01:21
Details
BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting valid values for the tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. The most likely outcome of a successful exploitation of the vulnerability is a crash of the named process. However, remote code execution, while unproven, is theoretically possible. Affects: BIND 9.5.0 -> 9.11.27, 9.12.0 -> 9.16.11, and versions BIND 9.11.3-S1 -> 9.11.27-S1 and 9.16.8-S1 -> 9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch
Aliases
Aliases
CVE-2020-8625


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-8625",
    "description": "BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND\u0027s default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting valid values for the tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. The most likely outcome of a successful exploitation of the vulnerability is a crash of the named process. However, remote code execution, while unproven, is theoretically possible. Affects: BIND 9.5.0 -\u003e 9.11.27, 9.12.0 -\u003e 9.16.11, and versions BIND 9.11.3-S1 -\u003e 9.11.27-S1 and 9.16.8-S1 -\u003e 9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch",
    "id": "GSD-2020-8625",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-8625.html",
      "https://www.debian.org/security/2021/dsa-4857",
      "https://access.redhat.com/errata/RHSA-2021:0922",
      "https://access.redhat.com/errata/RHSA-2021:0727",
      "https://access.redhat.com/errata/RHSA-2021:0694",
      "https://access.redhat.com/errata/RHSA-2021:0693",
      "https://access.redhat.com/errata/RHSA-2021:0692",
      "https://access.redhat.com/errata/RHSA-2021:0691",
      "https://access.redhat.com/errata/RHSA-2021:0672",
      "https://access.redhat.com/errata/RHSA-2021:0671",
      "https://access.redhat.com/errata/RHSA-2021:0670",
      "https://access.redhat.com/errata/RHSA-2021:0669",
      "https://ubuntu.com/security/CVE-2020-8625",
      "https://advisories.mageia.org/CVE-2020-8625.html",
      "https://security.archlinux.org/CVE-2020-8625",
      "https://alas.aws.amazon.com/cve/html/CVE-2020-8625.html",
      "https://linux.oracle.com/cve/CVE-2020-8625.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-8625"
      ],
      "details": "BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND\u0027s default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting valid values for the tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. The most likely outcome of a successful exploitation of the vulnerability is a crash of the named process. However, remote code execution, while unproven, is theoretically possible. Affects: BIND 9.5.0 -\u003e 9.11.27, 9.12.0 -\u003e 9.16.11, and versions BIND 9.11.3-S1 -\u003e 9.11.27-S1 and 9.16.8-S1 -\u003e 9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch",
      "id": "GSD-2020-8625",
      "modified": "2023-12-13T01:21:53.476673Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "security-officer@isc.org",
        "DATE_PUBLIC": "2021-02-17T20:01:13.000Z",
        "ID": "CVE-2020-8625",
        "STATE": "PUBLIC",
        "TITLE": "A vulnerability in BIND\u0027s GSSAPI security policy negotiation can be targeted by a buffer overflow attack"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "BIND9",
                    "version": {
                      "version_data": [
                        {
                          "version_name": "Open Source Branches 9.5 though 9.11",
                          "version_value": "9.5.0 through versions before 9.11.28"
                        },
                        {
                          "version_name": "Open Source Branches 9.12 though 9.16",
                          "version_value": "9.12.0 through versions before 9.16.12"
                        },
                        {
                          "version_name": "Supported Preview Branch 9.11-S",
                          "version_value": "9.11.3-S1 through versions before 9.11.28-S1"
                        },
                        {
                          "version_name": "Supported Preview Branch 9.16-S",
                          "version_value": "9.16.8-S1 through versions before 9.16.12-S1"
                        },
                        {
                          "version_name": "Development Branch 9.17",
                          "version_value": "9.17.0 through versions before 9.17.2"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "ISC"
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        }
      },
      "credit": [
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          "lang": "eng",
          "value": "ISC would like to thank an anonymous party, working in conjunction with Trend Micro Zero Day Initiative, for reporting this issue to us."
        }
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      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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            "value": "BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND\u0027s default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting valid values for the tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. The most likely outcome of a successful exploitation of the vulnerability is a crash of the named process. However, remote code execution, while unproven, is theoretically possible. Affects: BIND 9.5.0 -\u003e 9.11.27, 9.12.0 -\u003e 9.16.11, and versions BIND 9.11.3-S1 -\u003e 9.11.27-S1 and 9.16.8-S1 -\u003e 9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch"
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        }
      },
      "problemtype": {
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          {
            "description": [
              {
                "lang": "eng",
                "value": "BIND 9.5.0 -\u003e 9.11.27, 9.12.0 -\u003e 9.16.11, and versions BIND 9.11.3-S1 -\u003e 9.11.27-S1 and 9.16.8-S1 -\u003e 9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch:GSS-TSIG is an extension to the TSIG protocol which is intended to support the secure exchange of keys for use in verifying the authenticity of communications between parties on a network.  SPNEGO is a negotiation mechanism used by GSSAPI, the application protocol interface for GSS-TSIG.  The SPNEGO implementation used by BIND has been found to be vulnerable to a buffer overflow attack."
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://kb.isc.org/v1/docs/cve-2020-8625",
            "refsource": "CONFIRM",
            "url": "https://kb.isc.org/v1/docs/cve-2020-8625"
          },
          {
            "name": "DSA-4857",
            "refsource": "DEBIAN",
            "url": "https://www.debian.org/security/2021/dsa-4857"
          },
          {
            "name": "[oss-security] 20210218 BIND Operational Notification: Enabling the new BIND option \"stale-answer-client-timeout\" can result in unexpected server termination",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/02/19/1"
          },
          {
            "name": "[debian-lts-announce] 20210219 [SECURITY] [DLA 2568-1] bind9 security update",
            "refsource": "MLIST",
            "url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00029.html"
          },
          {
            "name": "[oss-security] 20210220 BIND Operational Notification: Zone journal (.jnl) file incompatibility,after upgrading to BIND 9.16.12 and 9.17",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/02/20/2"
          },
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            "url": "https://www.zerodayinitiative.com/advisories/ZDI-21-195/"
          },
          {
            "name": "FEDORA-2021-0595625865",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QWCMBOSZOJIIET7BWTRYS3HLX5TSDKHX/"
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          {
            "name": "FEDORA-2021-28f97e232d",
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KYXAF7G45RXDVNUTWWCI2CVTHRZ67LST/"
          },
          {
            "name": "https://security.netapp.com/advisory/ntap-20210319-0001/",
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            "url": "https://security.netapp.com/advisory/ntap-20210319-0001/"
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          {
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EBTPWRQWRQEJNWY4NHO4WLS4KLJ3ERHZ/"
          },
          {
            "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
            "refsource": "CONFIRM",
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
          }
        ]
      },
      "solution": [
        {
          "lang": "eng",
          "value": "Upgrade to the patched release most closely related to your current version of BIND:\n\n    BIND 9.11.28\n    BIND 9.16.12\n\nBIND Supported Preview Edition is a special feature-preview branch of BIND provided to eligible ISC support customers.\n\n    BIND 9.11.28-S1\n    BIND 9.16.12-S1\n\nAcknowledgments: ISC would like to thank an anonymous party, working in conjunction with Trend Micro Zero Day Initiative, for reporting this issue to us."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "work_around": [
        {
          "lang": "eng",
          "value": "This vulnerability only affects servers configured to use GSS-TSIG, most often to sign dynamic updates. If another mechanism can be used to authenticate updates, the vulnerability can be avoided by choosing not to enable the use of GSS-TSIG features.\n\nOn some platforms it may be possible to build a working BIND installation that is not vulnerable to CVE-2020-8625 by providing the --disable-isc-spnego command-line argument when running the ./configure script in the top level of the BIND source directory, before compiling and linking named.\n\nChoosing to configure and build BIND without the ISC SPNEGO implementation does not produce a vulnerable BIND on any platform, but on platforms where GSSAPI support in the system is lacking, building without the ISC SPNEGO implementation may result in unusable GSSAPI features (such as an inability to use GSS-TSIG-signed DDNS updates)."
        }
      ]
    },
    "nvd.nist.gov": {
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          "ID": "CVE-2020-8625"
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              "name": "FEDORA-2021-8b4744f152",
              "refsource": "FEDORA",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EBTPWRQWRQEJNWY4NHO4WLS4KLJ3ERHZ/"
            },
            {
              "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
              "refsource": "CONFIRM",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2022-04-18T19:25Z",
      "publishedDate": "2021-02-17T23:15Z"
    }
  }
}


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