nvd-json-data-feeds/CVE-2021/CVE-2021-212xx/CVE-2021-21274.json

{
  "id": "CVE-2021-21274",
  "sourceIdentifier": "security-advisories@github.com",
  "published": "2021-02-26T18:15:12.237",
  "lastModified": "2022-10-24T20:49:17.230",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.25.0, a malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver. This affects any server which accepts federation requests from untrusted servers. Issue is resolved in version 1.25.0. As a workaround the `federation_domain_whitelist` setting can be used to restrict the homeservers communicated with over federation."
    },
    {
      "lang": "es",
      "value": "Synapse es un servidor dom\u00e9stico de referencia de Matrix escrito en python (paquete pypi matrix-synapse). Matrix es un ecosistema para VoIP y mensajer\u00eda instant\u00e1nea federada abierta. En Synapse versiones anteriores a 1.25.0, un servidor dom\u00e9stico malicioso pod\u00eda redireccionar las peticiones para su archivo .well-known a un archivo grande. Esto puede conllevar a un ataque de denegaci\u00f3n de servicio en el que los servidores dom\u00e9sticos consumir\u00e1n significativamente m\u00e1s recursos al solicitar el archivo .well-known de un servidor dom\u00e9stico malicioso. Esto afecta a cualquier servidor que acepte peticiones de federaci\u00f3n desde servidores que no sean confiables. El problema es resuelto en versi\u00f3n 1.25.0. Como soluci\u00f3n alternativa, el ajuste de \"federation_domain_whitelist\" puede ser usado para restringir los servidores dom\u00e9sticos que se comunican con la federaci\u00f3n"
    }
  ],
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        "type": "Primary",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      },
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        "type": "Secondary",
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          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW",
          "baseScore": 4.3,
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          "accessVector": "NETWORK",
          "accessComplexity": "MEDIUM",
          "authentication": "NONE",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.3
        },
        "baseSeverity": "MEDIUM",
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
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        "obtainAllPrivilege": false,
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        "obtainOtherPrivilege": false,
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      }
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      "type": "Secondary",
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  "references": [
    {
      "url": "https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6",
      "source": "security-advisories@github.com",
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    },
    {
      "url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8",
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      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/",
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