FKIE_CVE-2020-8929

Vulnerability from fkie_nvd - Published: 2020-10-19 13:15 - Updated: 2026-06-17 03:27
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
A mis-handling of invalid unicode characters in the Java implementation of Tink versions prior to 1.5 allows an attacker to change the ID part of a ciphertext, which result in the creation of a second ciphertext that can decrypt to the same plaintext. This can be a problem with encrypting deterministic AEAD with a single key, and rely on a unique ciphertext-per-plaintext.
References
cve-coordination@google.comhttps://github.com/google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899Patch, Third Party Advisory
cve-coordination@google.comhttps://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2rPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2rPatch, Third Party Advisory
Impacted products
Vendor Product Version
google tink_java *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "platforms": [
            "Java"
          ],
          "product": "Tink",
          "vendor": "Google LLC",
          "versions": [
            {
              "lessThan": "1.5",
              "status": "affected",
              "version": "stable",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "cve-coordination@google.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:google:tink_java:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "79CF433A-2538-413E-B3A7-B07C4D2B9BDA",
              "versionEndExcluding": "1.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A mis-handling of invalid unicode characters in the Java implementation of Tink versions prior to 1.5 allows an attacker to change the ID part of a ciphertext, which result in the creation of a second ciphertext that can decrypt to the same plaintext. This can be a problem with encrypting deterministic AEAD with a single key, and rely on a unique ciphertext-per-plaintext."
    },
    {
      "lang": "es",
      "value": "Un manejo inapropiado de caracteres Unicode no v\u00e1lidos en la implementaci\u00f3n de Java Tink versiones anteriores a 1.5, permite a un atacante cambiar la parte del ID de un texto cifrado, lo que resulta en la creaci\u00f3n de un segundo texto cifrado que puede descifrarse en el mismo texto plano.\u0026#xa0;Esto puede ser un problema con el cifrado AEAD determinista con una sola clave y depender de un \u00fanico texto cifrado por texto plano"
    }
  ],
  "id": "CVE-2020-8929",
  "lastModified": "2026-06-17T03:27:11.487",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "cve-coordination@google.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-10-19T13:15:13.437",
  "references": [
    {
      "source": "cve-coordination@google.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899"
    },
    {
      "source": "cve-coordination@google.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2r"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2r"
    }
  ],
  "sourceIdentifier": "cve-coordination@google.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-176"
        }
      ],
      "source": "cve-coordination@google.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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