WID-SEC-W-2022-1481

Vulnerability from csaf_certbund - Published: 2020-11-05 23:00 - Updated: 2023-01-11 23:00
Summary
MIT Kerberos: Schwachstelle ermöglicht Denial of Service
Severity
Mittel
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Kerberos ist ein verteilter Netzwerkdienst zur Authentifizierung. MIT Kerberos ist die freie Implementierung des "Kerberos network authentication protocol", des Massachusetts Institute of Technology (MIT).
Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in MIT Kerberos ausnutzen, um einen Denial of Service Angriff durchzuführen.
Betroffene Betriebssysteme: - UNIX - Linux - Windows - Sonstiges
CVE-2020-28196

Es existiert eine Schwachstelle in MIT Kerberos. Der libkrb5 ASN.1-Decoder unterstützt unbegrenzte BER-Längen. Die Tag-Länge wird mithilfe einer Rekursion berechnet. Das Fehlen eines Rekursionslimits ermöglicht es einem entfernten anonymen Angreifer einen Stapelüberlauf zu verursachen und den Prozess zum Absturz zu bringen.

Affected products
Product Identifier Version Remediation
Debian Linux
Debian
 cpe:/o:debian:debian_linux:- —
SUSE Linux
SUSE
 cpe:/o:suse:suse_linux:- —
Red Hat Enterprise Linux
Red Hat
 cpe:/o:redhat:enterprise_linux:- —
Oracle Solaris
Oracle
 cpe:/a:oracle:solaris:- —
Amazon Linux 2
Amazon
 cpe:/o:amazon:linux_2:- —
Gentoo Linux
Gentoo
 cpe:/o:gentoo:linux:- —
Oracle Linux
Oracle
 cpe:/o:oracle:linux:- —
Juniper Contrail Service Orchestration
Juniper
 cpe:/a:juniper:contrail_service_orchestration:- —
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Kerberos ist ein verteilter Netzwerkdienst zur Authentifizierung. MIT Kerberos ist die freie Implementierung des \"Kerberos network authentication protocol\", des Massachusetts Institute of Technology (MIT).",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in MIT Kerberos ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- UNIX\n- Linux\n- Windows\n- Sonstiges",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2022-1481 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2020/wid-sec-w-2022-1481.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2022-1481 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2022-1481"
      },
      {
        "category": "external",
        "summary": "Juniper Security Advisory JSA70182 vom 2023-01-12",
        "url": "https://supportportal.juniper.net/s/article/2023-01-Security-Bulletin-Contrail-Service-Orchestration-Multiple-vulnerabilities-resolved-in-CSO-6-3-0?language=en_US"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:2239 vom 2021-06-03",
        "url": "https://access.redhat.com/errata/RHSA-2021:2239"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2021-9294 vom 2021-06-11",
        "url": "http://linux.oracle.com/errata/ELSA-2021-9294.html"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:1593 vom 2021-05-18",
        "url": "https://access.redhat.com/errata/RHSA-2021:1593"
      },
      {
        "category": "external",
        "summary": "Github Krb5 vom 2020-11-05",
        "url": "https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DLA-2437 vom 2020-11-07",
        "url": "https://lists.debian.org/debian-lts-announce/2020/11/msg00011.html"
      },
      {
        "category": "external",
        "summary": "Gentoo Linux Security Advisory GLSA-202011-17 vom 2020-11-16",
        "url": "https://security.gentoo.org/glsa/202011-17"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2020:3375-1 vom 2020-11-19",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2020-November/007801.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2020:3379-1 vom 2020-11-19",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2020-November/007792.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2020:3377-1 vom 2020-11-19",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2020-November/007793.html"
      },
      {
        "category": "external",
        "summary": "Debian Security Advisory DSA-4795 vom 2020-11-22",
        "url": "https://www.debian.org/security/2020/dsa-4795"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:2461 vom 2021-06-16",
        "url": "https://access.redhat.com/errata/RHSA-2021:2461"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:2479 vom 2021-06-17",
        "url": "https://access.redhat.com/errata/RHSA-2021:2479"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:2532 vom 2021-06-23",
        "url": "https://access.redhat.com/errata/RHSA-2021:2532"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:2543 vom 2021-06-24",
        "url": "https://access.redhat.com/errata/RHSA-2021:2543"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:3016 vom 2021-08-06",
        "url": "https://access.redhat.com/errata/RHSA-2021:3016"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:3119 vom 2021-08-10",
        "url": "https://access.redhat.com/errata/RHSA-2021:3119"
      },
      {
        "category": "external",
        "summary": "Red Hat Security Advisory RHSA-2021:3556 vom 2021-09-17",
        "url": "https://access.redhat.com/errata/RHSA-2021:3556"
      },
      {
        "category": "external",
        "summary": "Amazon Linux Security Advisory ALAS-2022-1845 vom 2022-09-21",
        "url": "https://alas.aws.amazon.com/AL2/ALAS-2022-1845.html"
      },
      {
        "category": "external",
        "summary": "Oracle Solaris Third Party Bulletin-October 2022 vom 2022-10-18",
        "url": "https://www.oracle.com/security-alerts/bulletinoct2022.html"
      }
    ],
    "source_lang": "en-US",
    "title": "MIT Kerberos: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2023-01-11T23:00:00.000+00:00",
      "generator": {
        "date": "2024-08-15T17:35:27.507+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.5"
        }
      },
      "id": "WID-SEC-W-2022-1481",
      "initial_release_date": "2020-11-05T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2020-11-05T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2020-11-08T23:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Debian aufgenommen"
        },
        {
          "date": "2020-11-15T23:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Gentoo aufgenommen"
        },
        {
          "date": "2020-11-19T23:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2020-11-22T23:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von Debian aufgenommen"
        },
        {
          "date": "2021-05-18T22:00:00.000+00:00",
          "number": "6",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-06-03T22:00:00.000+00:00",
          "number": "7",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-06-10T22:00:00.000+00:00",
          "number": "8",
          "summary": "Neue Updates von Oracle Linux aufgenommen"
        },
        {
          "date": "2021-06-16T22:00:00.000+00:00",
          "number": "9",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-06-17T22:00:00.000+00:00",
          "number": "10",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-06-23T22:00:00.000+00:00",
          "number": "11",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-06-24T22:00:00.000+00:00",
          "number": "12",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-08-05T22:00:00.000+00:00",
          "number": "13",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-08-10T22:00:00.000+00:00",
          "number": "14",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2021-09-16T22:00:00.000+00:00",
          "number": "15",
          "summary": "Neue Updates von Red Hat aufgenommen"
        },
        {
          "date": "2022-09-20T22:00:00.000+00:00",
          "number": "16",
          "summary": "Neue Updates von Amazon aufgenommen"
        },
        {
          "date": "2022-10-18T22:00:00.000+00:00",
          "number": "17",
          "summary": "Neue Updates aufgenommen"
        },
        {
          "date": "2023-01-11T23:00:00.000+00:00",
          "number": "18",
          "summary": "Neue Updates von Juniper aufgenommen"
        }
      ],
      "status": "final",
      "version": "18"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Amazon Linux 2",
            "product": {
              "name": "Amazon Linux 2",
              "product_id": "398363",
              "product_identification_helper": {
                "cpe": "cpe:/o:amazon:linux_2:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Amazon"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Debian Linux",
            "product": {
              "name": "Debian Linux",
              "product_id": "2951",
              "product_identification_helper": {
                "cpe": "cpe:/o:debian:debian_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Debian"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Gentoo Linux",
            "product": {
              "name": "Gentoo Linux",
              "product_id": "T012167",
              "product_identification_helper": {
                "cpe": "cpe:/o:gentoo:linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Gentoo"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Juniper Contrail Service Orchestration",
            "product": {
              "name": "Juniper Contrail Service Orchestration",
              "product_id": "T025794",
              "product_identification_helper": {
                "cpe": "cpe:/a:juniper:contrail_service_orchestration:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Juniper"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "MIT Kerberos \u003c 1.17.2",
                "product": {
                  "name": "MIT Kerberos \u003c 1.17.2",
                  "product_id": "T017628",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:mit:kerberos:1.17.2"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "MIT Kerberos \u003c 1.18.3",
                "product": {
                  "name": "MIT Kerberos \u003c 1.18.3",
                  "product_id": "T017629",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:mit:kerberos:1.18.3"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Kerberos"
          }
        ],
        "category": "vendor",
        "name": "MIT"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Oracle Linux",
            "product": {
              "name": "Oracle Linux",
              "product_id": "T004914",
              "product_identification_helper": {
                "cpe": "cpe:/o:oracle:linux:-"
              }
            }
          },
          {
            "category": "product_name",
            "name": "Oracle Solaris",
            "product": {
              "name": "Oracle Solaris",
              "product_id": "T002965",
              "product_identification_helper": {
                "cpe": "cpe:/a:oracle:solaris:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Oracle"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Red Hat Enterprise Linux",
            "product": {
              "name": "Red Hat Enterprise Linux",
              "product_id": "67646",
              "product_identification_helper": {
                "cpe": "cpe:/o:redhat:enterprise_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE Linux",
            "product": {
              "name": "SUSE Linux",
              "product_id": "T002207",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:suse_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-28196",
      "notes": [
        {
          "category": "description",
          "text": "Es existiert eine Schwachstelle in MIT Kerberos. Der libkrb5 ASN.1-Decoder unterst\u00fctzt unbegrenzte BER-L\u00e4ngen. Die Tag-L\u00e4nge wird mithilfe einer Rekursion berechnet. Das Fehlen eines Rekursionslimits erm\u00f6glicht es einem entfernten anonymen Angreifer einen Stapel\u00fcberlauf zu verursachen und den Prozess zum Absturz zu bringen."
        }
      ],
      "product_status": {
        "known_affected": [
          "2951",
          "T002207",
          "67646",
          "T002965",
          "398363",
          "T012167",
          "T004914",
          "T025794"
        ]
      },
      "release_date": "2020-11-05T23:00:00.000+00:00",
      "title": "CVE-2020-28196"
    }
  ]
}



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