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    "description": "Internally libssl in OpenSSL calls X509_verify_cert() on the client side to verify a certificate supplied by a server. That function may return a negative return value to indicate an internal error (for example out of memory). Such a negative return value is mishandled by OpenSSL and will cause an IO function (such as SSL_connect() or SSL_do_handshake()) to not indicate success and a subsequent call to SSL_get_error() to return the value SSL_ERROR_WANT_RETRY_VERIFY. This return value is only supposed to be returned by OpenSSL if the application has previously called SSL_CTX_set_cert_verify_callback(). Since most applications do not do this the SSL_ERROR_WANT_RETRY_VERIFY return value from SSL_get_error() will be totally unexpected and applications may not behave correctly as a result. The exact behaviour will depend on the application but it could result in crashes, infinite loops or other similar incorrect responses. This issue is made more serious in combination with a separate bug in OpenSSL 3.0 that will cause X509_verify_cert() to indicate an internal error when processing a certificate chain. This will occur where a certificate does not include the Subject Alternative Name extension but where a Certificate Authority has enforced name constraints. This issue can occur even with valid chains. By combining the two issues an attacker could induce incorrect, application dependent behaviour. Fixed in OpenSSL 3.0.1 (Affected 3.0.0).",
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      "https://security.archlinux.org/CVE-2021-4044"
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      "modified": "2023-12-13T01:23:11.434466Z",
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{
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        "name": "openssl-src"
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      "CWE-835"
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    "github_reviewed": true,
    "github_reviewed_at": "2022-06-17T00:01:23Z",
    "nvd_published_at": "2021-12-14T19:15:00Z",
    "severity": "HIGH"
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  "id": "GHSA-mmjf-f5jw-w72q",
  "modified": "2022-09-19T21:58:21Z",
  "published": "2021-12-15T00:00:42Z",
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    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0129.html"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20211229-0003"
    },
    {
      "type": "WEB",
      "url": "https://www.openssl.org/news/secadv/20211214.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Invalid handling of `X509_verify_cert()` internal errors in libssl"
}

{
  "document": {
    "aggregate_severity": {
      "text": "niedrig"
    },
    "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": "OpenSSL ist eine im Quelltext frei verf\u00fcgbare Bibliothek, die Secure Sockets Layer (SSL) und Transport Layer Security (TLS) implementiert.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in OpenSSL ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- MacOS X\n- NetApp Appliance\n- Sonstiges\n- UNIX\n- Windows",
        "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-2024-0958 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2024-0958.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2024-0958 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2024-0958"
      },
      {
        "category": "external",
        "summary": "OpenSSL Security Advisory vom 2021-12-14",
        "url": "https://www.openssl.org/news/secadv/20211214.txt"
      },
      {
        "category": "external",
        "summary": "F5 Security Advisory K83823933 vom 2021-12-31",
        "url": "https://support.f5.com/csp/article/K83823933"
      },
      {
        "category": "external",
        "summary": "NetApp Security Advisory NTAP-20211229-0003 vom 2022-01-03",
        "url": "https://security.netapp.com/advisory/ntap-20211229-0003/"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2024-20865 vom 2024-04-25",
        "url": "https://linux.oracle.com/errata/ELSA-2024-20865.html"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2024-12343 vom 2024-04-25",
        "url": "https://linux.oracle.com/errata/ELSA-2024-12343.html"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2024-23120 vom 2024-06-04",
        "url": "https://linux.oracle.com/errata/ELSA-2024-23120.html"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2024-12408 vom 2024-06-05",
        "url": "https://linux.oracle.com/errata/ELSA-2024-12408.html"
      },
      {
        "category": "external",
        "summary": "Oracle Linux Security Advisory ELSA-2024-12409 vom 2024-06-04",
        "url": "https://linux.oracle.com/errata/ELSA-2024-12409.html"
      }
    ],
    "source_lang": "en-US",
    "title": "OpenSSL: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2024-06-04T22:00:00.000+00:00",
      "generator": {
        "date": "2024-06-05T08:09:02.103+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.0"
        }
      },
      "id": "WID-SEC-W-2024-0958",
      "initial_release_date": "2021-12-14T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2021-12-14T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2021-12-30T23:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von F5 aufgenommen"
        },
        {
          "date": "2022-01-03T23:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von NetApp aufgenommen"
        },
        {
          "date": "2024-04-24T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von Oracle Linux aufgenommen"
        },
        {
          "date": "2024-06-04T22:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von Oracle Linux aufgenommen"
        }
      ],
      "status": "final",
      "version": "5"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "F5 BIG-IP",
            "product": {
              "name": "F5 BIG-IP",
              "product_id": "T001663",
              "product_identification_helper": {
                "cpe": "cpe:/a:f5:big-ip:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "F5"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "NetApp FAS",
            "product": {
              "name": "NetApp FAS",
              "product_id": "T011540",
              "product_identification_helper": {
                "cpe": "cpe:/h:netapp:fas:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "NetApp"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0.0",
                "product": {
                  "name": "Open Source OpenSSL 3.0.0",
                  "product_id": "T021310",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:openssl:openssl:3.0.0"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "OpenSSL"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Oracle Linux",
            "product": {
              "name": "Oracle Linux",
              "product_id": "T004914",
              "product_identification_helper": {
                "cpe": "cpe:/o:oracle:linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Oracle"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-4044",
      "notes": [
        {
          "category": "description",
          "text": "Es existiert eine Schwachstelle in OpenSSL bei der clientseitigen Pr\u00fcfung von X.509 Server-Zertifikaten. Die Funktion X509_verify_cert() gibt unter bestimmten Umst\u00e4nden negative Statuswerte zur\u00fcck, die von der aufrufenden Funktion (z.B. SSL_connect() oder SSL_do_handshake()) falsch interpretiert werden. Diese Situation wird beispielsweise erreicht, wenn in einem zu pr\u00fcfenden Zertifikat die X.509 Erweiterung \"SubjectAltName\" nicht vorhanden ist, aber ein in der Kette dar\u00fcber befindliches Zertifikat die X.509 Erweiterung \"nameConstraint\" enth\u00e4lt. Ein Angreifer, der einen b\u00f6sartigen Server kontrolliert, kann dies ausnutzen, um einen Denial of Service Zustand oder ein nicht vorhersehbares Verhalten bez\u00fcglich des Clients herbeizuf\u00fchren. Zur erfolgreichen Ausnutzung ist eine Benutzeraktion erforderlich."
        }
      ],
      "product_status": {
        "known_affected": [
          "T011540",
          "T001663",
          "T004914",
          "T021310"
        ]
      },
      "release_date": "2021-12-14T23:00:00Z",
      "title": "CVE-2021-4044"
    }
  ]
}