{
  "id": "CVE-2023-46132",
  "sourceIdentifier": "security-advisories@github.com",
  "published": "2023-11-14T21:15:11.003",
  "lastModified": "2023-11-22T15:12:30.857",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "Hyperledger Fabric is an open source permissioned distributed ledger framework. Combining two molecules to one another, called \"cross-linking\" results in a molecule with a chemical formula that is composed of all atoms of the original two molecules. In Fabric, one can take a block of transactions and cross-link the transactions in a way that alters the way the peers parse the transactions. If a first peer receives a block B and a second peer receives a block identical to B but with the transactions being cross-linked, the second peer will parse transactions in a different way and thus its world state will deviate from the first peer. Orderers or peers cannot detect that a block has its transactions cross-linked, because there is a vulnerability in the way Fabric hashes the transactions of blocks. It simply and naively concatenates them, which is insecure and lets an adversary craft a \"cross-linked block\" (block with cross-linked transactions) which alters the way peers process transactions. For example, it is possible to select a transaction and manipulate a peer to completely avoid processing it, without changing the computed hash of the block. Additional validations have been added in v2.2.14 and v2.5.5 to detect potential cross-linking issues before processing blocks. Users are advised to upgrade. There are no known workarounds for this vulnerability."
    },
    {
      "lang": "es",
      "value": "Hyperledger Fabric es un framework de contabilidad distribuido con permisos de c\u00f3digo abierto. La combinaci\u00f3n de dos mol\u00e9culas entre s\u00ed, lo que se denomina \"cross-linking\", da como resultado una mol\u00e9cula con una f\u00f3rmula qu\u00edmica que est\u00e1 compuesta por todos los \u00e1tomos de las dos mol\u00e9culas originales. En Fabric, se puede tomar un bloque de transacciones y vincular las transacciones de una manera que altere la forma en que los pares analizan las transacciones. Si un primer par recibe un bloque B y un segundo par recibe un bloque id\u00e9ntico a B pero con las transacciones cross-linked, el segundo par analizar\u00e1 las transacciones de una manera diferente y, por lo tanto, su estado mundial se desviar\u00e1 del primer par. Los ordenantes o pares no pueden detectar que un bloque tiene sus transacciones cross-linked, porque existe una vulnerabilidad en la forma en que Fabric procesa las transacciones de los bloques. Los concatena de manera simple e ingenua, lo cual es inseguro y permite que un adversario cree un \"cross-linked block\" (bloque con transacciones entrecruzadas) que altera la forma en que los pares procesan las transacciones. Por ejemplo, es posible seleccionar una transacci\u00f3n y manipular un par para evitar por completo procesarla, sin cambiar el hash calculado del bloque. Se agregaron validaciones adicionales en v2.2.14 y v2.5.5 para detectar posibles problemas de cross-linking antes de procesar bloques. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      },
      {
        "source": "security-advisories@github.com",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "LOW",
          "baseScore": 7.1,
          "baseSeverity": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2
      }
    ]
  },
  "weaknesses": [
    {
      "source": "security-advisories@github.com",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:hyperledger:fabric:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "1.0.0",
              "versionEndExcluding": "2.2.14",
              "matchCriteriaId": "A1424E57-3AD8-488F-B35C-EF4A020804DE"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:hyperledger:fabric:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "2.3.0",
              "versionEndExcluding": "2.5.5",
              "matchCriteriaId": "5595B581-80B8-4797-9C3C-73D57A0DF6ED"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/hyperledger/fabric/security/advisories/GHSA-v9w2-543f-h69m",
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}