CVE-2023-6237 (GCVE-0-2023-6237)

Vulnerability from cvelistv5 – Published: 2024-04-25 06:27 – Updated: 2026-05-12 10:41
VLAI
Title
Excessive time spent checking invalid RSA public keys
Summary
Issue summary: Checking excessively long invalid RSA public keys may take a long time. Impact summary: Applications that use the function EVP_PKEY_public_check() to check RSA public keys may experience long delays. Where the key that is being checked has been obtained from an untrusted source this may lead to a Denial of Service. When function EVP_PKEY_public_check() is called on RSA public keys, a computation is done to confirm that the RSA modulus, n, is composite. For valid RSA keys, n is a product of two or more large primes and this computation completes quickly. However, if n is an overly large prime, then this computation would take a long time. An application that calls EVP_PKEY_public_check() and supplies an RSA key obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function EVP_PKEY_public_check() is not called from other OpenSSL functions however it is called from the OpenSSL pkey command line application. For that reason that application is also vulnerable if used with the '-pubin' and '-check' options on untrusted data. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-606 - Unchecked Input for Loop Condition
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.0.0 , < 3.0.13 (semver)
Affected: 3.1.0 , < 3.1.5 (semver)
Affected: 3.2.0 , < 3.2.1 (semver)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Siemens SINEC NMS Affected: 0 , < V3.0 SP1 (custom)
Create a notification for this product.
Date Public
2024-01-15 00:00
Credits
OSS-Fuzz Tomas Mraz
Show details on NVD website
To clipboard 

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Where the key that\\nis being checked has been obtained from an untrusted source this may lead\\nto a Denial of Service.\\n\\nWhen function EVP_PKEY_public_check() is called on RSA public keys,\\na computation is done to confirm that the RSA modulus, n, is composite.\\nFor valid RSA keys, n is a product of two or more large primes and this\\ncomputation completes quickly. However, if n is an overly large prime,\\nthen this computation would take a long time.\\n\\nAn application that calls EVP_PKEY_public_check() and supplies an RSA key\\nobtained from an untrusted source could be vulnerable to a Denial of Service\\nattack.\\n\\nThe function EVP_PKEY_public_check() is not called from other OpenSSL\\nfunctions however it is called from the OpenSSL pkey command line\\napplication. For that reason that application is also vulnerable if used\\nwith the \u0027-pubin\u0027 and \u0027-check\u0027 options on untrusted data.\\n\\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\\n\\nThe OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: Checking excessively long invalid RSA public keys may take\u003cbr\u003ea long time.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that use the function EVP_PKEY_public_check()\u003cbr\u003eto check RSA public keys may experience long delays. Where the key that\u003cbr\u003eis being checked has been obtained from an untrusted source this may lead\u003cbr\u003eto a Denial of Service.\u003cbr\u003e\u003cbr\u003eWhen function EVP_PKEY_public_check() is called on RSA public keys,\u003cbr\u003ea computation is done to confirm that the RSA modulus, n, is composite.\u003cbr\u003eFor valid RSA keys, n is a product of two or more large primes and this\u003cbr\u003ecomputation completes quickly. However, if n is an overly large prime,\u003cbr\u003ethen this computation would take a long time.\u003cbr\u003e\u003cbr\u003eAn application that calls EVP_PKEY_public_check() and supplies an RSA key\u003cbr\u003eobtained from an untrusted source could be vulnerable to a Denial of Service\u003cbr\u003eattack.\u003cbr\u003e\u003cbr\u003eThe function EVP_PKEY_public_check() is not called from other OpenSSL\u003cbr\u003efunctions however it is called from the OpenSSL pkey command line\u003cbr\u003eapplication. For that reason that application is also vulnerable if used\u003cbr\u003ewith the \u0027-pubin\u0027 and \u0027-check\u0027 options on untrusted data.\u003cbr\u003e\u003cbr\u003eThe OpenSSL SSL/TLS implementation is not affected by this issue.\u003cbr\u003e\u003cbr\u003eThe OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-606\", \"description\": \"CWE-606 Unchecked Input for Loop Condition\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2024-10-14T14:55:56.955Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-6237\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-12T10:41:05.568Z\", \"dateReserved\": \"2023-11-21T10:16:34.346Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2024-04-25T06:27:26.990Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.