CVE-2023-5363 (GCVE-0-2023-5363)

Vulnerability from cvelistv5 – Published: 2023-10-24 15:31 – Updated: 2026-05-12 10:22
VLAI
Title
Incorrect cipher key & IV length processing
Summary
Issue summary: A bug has been identified in the processing of key and initialisation vector (IV) lengths. This can lead to potential truncation or overruns during the initialisation of some symmetric ciphers. Impact summary: A truncation in the IV can result in non-uniqueness, which could result in loss of confidentiality for some cipher modes. When calling EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() or EVP_CipherInit_ex2() the provided OSSL_PARAM array is processed after the key and IV have been established. Any alterations to the key length, via the "keylen" parameter or the IV length, via the "ivlen" parameter, within the OSSL_PARAM array will not take effect as intended, potentially causing truncation or overreading of these values. The following ciphers and cipher modes are impacted: RC2, RC4, RC5, CCM, GCM and OCB. For the CCM, GCM and OCB cipher modes, truncation of the IV can result in loss of confidentiality. For example, when following NIST's SP 800-38D section 8.2.1 guidance for constructing a deterministic IV for AES in GCM mode, truncation of the counter portion could lead to IV reuse. Both truncations and overruns of the key and overruns of the IV will produce incorrect results and could, in some cases, trigger a memory exception. However, these issues are not currently assessed as security critical. Changing the key and/or IV lengths is not considered to be a common operation and the vulnerable API was recently introduced. Furthermore it is likely that application developers will have spotted this problem during testing since decryption would fail unless both peers in the communication were similarly vulnerable. For these reasons we expect the probability of an application being vulnerable to this to be quite low. However if an application is vulnerable then this issue is considered very serious. For these reasons we have assessed this issue as Moderate severity overall. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this because the issue lies outside of the FIPS provider boundary. OpenSSL 3.1 and 3.0 are vulnerable to this issue.
Severity
No CVSS data available.
CWE
  • CWE-684 - Incorrect Provision of Specified Functionality
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.0.0 , < 3.0.12 (semver)
Affected: 3.1.0 , < 3.1.4 (semver)
Create a notification for this product.
Date Public
2023-10-24 00:00
Credits
Tony Battersby (Cybernetics) Dr Paul Dale
Show details on NVD website
To clipboard 

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For these reasons we have assessed this\\nissue as Moderate severity overall.\\n\\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\\n\\nThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this because\\nthe issue lies outside of the FIPS provider boundary.\\n\\nOpenSSL 3.1 and 3.0 are vulnerable to this issue.\"},{\"lang\":\"es\",\"value\":\"Resumen del problema: se ha identificado un error en el procesamiento de longitudes de clave y vector de inicializaci\u00f3n (IV). Esto puede provocar posibles truncamientos o desbordamientos durante la inicializaci\u00f3n de algunos cifrados sim\u00e9tricos. Resumen de impacto: un truncamiento en el IV puede dar como resultado una falta de unicidad, lo que podr\u00eda resultar en la p\u00e9rdida de confidencialidad para algunos modos de cifrado. Al llamar a EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() or EVP_CipherInit_ex2(), la matriz OSSL_PARAM proporcionada se procesa despu\u00e9s de que se hayan establecido la clave y el IV. Cualquier modificaci\u00f3n en la longitud de la clave, a trav\u00e9s del par\u00e1metro \\\"keylen\\\" o la longitud del IV, a trav\u00e9s del par\u00e1metro \\\"ivlen\\\", dentro de la matriz OSSL_PARAM no tendr\u00e1 efecto seg\u00fan lo previsto, lo que podr\u00eda provocar el truncamiento o la sobrelectura de estos valores. Los siguientes cifrados y modos de cifrado se ven afectados: RC2, RC4, RC5, CCM, GCM y OCB. Para los modos de cifrado CCM, GCM y OCB, el truncamiento del IV puede provocar una p\u00e9rdida de confidencialidad. Por ejemplo, al seguir la gu\u00eda de la secci\u00f3n 8.2.1 SP 800-38D del NIST para construir un IV determinista para AES en modo GCM, el truncamiento de la parte del contador podr\u00eda llevar a la reutilizaci\u00f3n del IV. Tanto los truncamientos como los desbordamientos de la clave y del IV producir\u00e1n resultados incorrectos y, en algunos casos, podr\u00edan desencadenar una excepci\u00f3n de memoria. Sin embargo, actualmente estos problemas no se consideran cr\u00edticos para la seguridad. Cambiar la clave y/o las longitudes de IV no se considera una operaci\u00f3n com\u00fan y la API vulnerable se introdujo recientemente. Adem\u00e1s, es probable que los desarrolladores de aplicaciones hayan detectado este problema durante las pruebas, ya que el descifrado fallar\u00eda a menos que ambos interlocutores en la comunicaci\u00f3n fueran igualmente vulnerables. Por estas razones, esperamos que la probabilidad de que una aplicaci\u00f3n sea vulnerable a esto sea bastante baja. Sin embargo, si una aplicaci\u00f3n es vulnerable, el problema se considera muy grave. Por estos motivos, hemos evaluado este problema como de gravedad moderada en general. La implementaci\u00f3n de OpenSSL SSL/TLS no se ve afectada por este problema. Los proveedores FIPS OpenSSL 3.0 y 3.1 no se ven afectados por esto porque el problema se encuentra fuera de los l\u00edmites del proveedor FIPS. OpenSSL 3.1 y 3.0 son vulnerables a este 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This can lead to potential truncation\\nor overruns during the initialisation of some symmetric ciphers.\\n\\nImpact summary: A truncation in the IV can result in non-uniqueness,\\nwhich could result in loss of confidentiality for some cipher modes.\\n\\nWhen calling EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() or\\nEVP_CipherInit_ex2() the provided OSSL_PARAM array is processed after\\nthe key and IV have been established.  Any alterations to the key length,\\nvia the \\\"keylen\\\" parameter or the IV length, via the \\\"ivlen\\\" parameter,\\nwithin the OSSL_PARAM array will not take effect as intended, potentially\\ncausing truncation or overreading of these values.  The following ciphers\\nand cipher modes are impacted: RC2, RC4, RC5, CCM, GCM and OCB.\\n\\nFor the CCM, GCM and OCB cipher modes, truncation of the IV can result in\\nloss of confidentiality.  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For these reasons we have assessed this\\nissue as Moderate severity overall.\\n\\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\\n\\nThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this because\\nthe issue lies outside of the FIPS provider boundary.\\n\\nOpenSSL 3.1 and 3.0 are vulnerable to this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: A bug has been identified in the processing of key and\u003cbr\u003einitialisation vector (IV) lengths.  This can lead to potential truncation\u003cbr\u003eor overruns during the initialisation of some symmetric ciphers.\u003cbr\u003e\u003cbr\u003eImpact summary: A truncation in the IV can result in non-uniqueness,\u003cbr\u003ewhich could result in loss of confidentiality for some cipher modes.\u003cbr\u003e\u003cbr\u003eWhen calling EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() or\u003cbr\u003eEVP_CipherInit_ex2() the provided OSSL_PARAM array is processed after\u003cbr\u003ethe key and IV have been established.  Any alterations to the key length,\u003cbr\u003evia the \\\"keylen\\\" parameter or the IV length, via the \\\"ivlen\\\" parameter,\u003cbr\u003ewithin the OSSL_PARAM array will not take effect as intended, potentially\u003cbr\u003ecausing truncation or overreading of these values.  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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
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}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.