CVE-2023-3817 (GCVE-0-2023-3817)

Vulnerability from cvelistv5 – Published: 2023-07-31 15:34 – Updated: 2025-05-05 15:53
VLAI
Title
Excessive time spent checking DH q parameter value
Summary
Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the "-check" option. 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 issue.
Severity
No CVSS data available.
CWE
  • CWE-606 - Unchecked Input for Loop Condition
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.1.0 , < 3.1.2 (semver)
Affected: 3.0.0 , < 3.0.10 (semver)
Affected: 1.1.1 , < 1.1.1v (custom)
Affected: 1.0.2 , < 1.0.2zi (custom)
Create a notification for this product.
Date Public
2023-07-31 00:00
Credits
Bernd Edlinger Tomas Mraz
Show details on NVD website
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\"https://security.netapp.com/advisory/ntap-20240621-0006/\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T07:08:50.496Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-3817\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-04-23T13:26:20.624850Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-05-05T13:04:24.062Z\"}}], \"cna\": {\"title\": \"Excessive time spent checking DH q parameter value\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"user\": \"00000000-0000-4000-9000-000000000000\", \"value\": \"Bernd Edlinger\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"user\": \"00000000-0000-4000-9000-000000000000\", \"value\": \"Tomas Mraz\"}], \"metrics\": [{\"other\": {\"type\": \"https://www.openssl.org/policies/secpolicy.html\", \"content\": {\"text\": \"Low\"}}, \"format\": \"other\"}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.1.0\", \"lessThan\": \"3.1.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.0.0\", \"lessThan\": \"3.0.10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.1.1\", \"lessThan\": \"1.1.1v\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"1.0.2\", \"lessThan\": \"1.0.2zi\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2023-07-31T00:00:00.000Z\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20230731.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5\", \"name\": \"3.1.2 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f\", \"name\": \"3.0.10 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5\", \"name\": \"1.1.1v git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644\", \"name\": \"1.0.2zi patch (premium)\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue summary: Checking excessively long DH keys or parameters may be very slow.\\n\\nImpact summary: Applications that use the functions DH_check(), DH_check_ex()\\nor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\\ndelays. Where the key or parameters that are being checked have been obtained\\nfrom an untrusted source this may lead to a Denial of Service.\\n\\nThe function DH_check() performs various checks on DH parameters. After fixing\\nCVE-2023-3446 it was discovered that a large q parameter value can also trigger\\nan overly long computation during some of these checks. A correct q value,\\nif present, cannot be larger than the modulus p parameter, thus it is\\nunnecessary to perform these checks if q is larger than p.\\n\\nAn application that calls DH_check() and supplies a key or parameters obtained\\nfrom an untrusted source could be vulnerable to a Denial of Service attack.\\n\\nThe function DH_check() is itself called by a number of other OpenSSL functions.\\nAn application calling any of those other functions may similarly be affected.\\nThe other functions affected by this are DH_check_ex() and\\nEVP_PKEY_param_check().\\n\\nAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\\nwhen using the \\\"-check\\\" option.\\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 issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: Checking excessively long DH keys or parameters may be very slow.\u003cbr\u003e\u003cbr\u003eImpact summary: Applications that use the functions DH_check(), DH_check_ex()\u003cbr\u003eor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\u003cbr\u003edelays. Where the key or parameters that are being checked have been obtained\u003cbr\u003efrom an untrusted source this may lead to a Denial of Service.\u003cbr\u003e\u003cbr\u003eThe function DH_check() performs various checks on DH parameters. After fixing\u003cbr\u003eCVE-2023-3446 it was discovered that a large q parameter value can also trigger\u003cbr\u003ean overly long computation during some of these checks. A correct q value,\u003cbr\u003eif present, cannot be larger than the modulus p parameter, thus it is\u003cbr\u003eunnecessary to perform these checks if q is larger than p.\u003cbr\u003e\u003cbr\u003eAn application that calls DH_check() and supplies a key or parameters obtained\u003cbr\u003efrom an untrusted source could be vulnerable to a Denial of Service attack.\u003cbr\u003e\u003cbr\u003eThe function DH_check() is itself called by a number of other OpenSSL functions.\u003cbr\u003eAn application calling any of those other functions may similarly be affected.\u003cbr\u003eThe other functions affected by this are DH_check_ex() and\u003cbr\u003eEVP_PKEY_param_check().\u003cbr\u003e\u003cbr\u003eAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\u003cbr\u003ewhen using the \\\"-check\\\" option.\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 not 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\": \"2024-10-14T14:55:48.907Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-3817\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-05T15:53:49.014Z\", \"dateReserved\": \"2023-07-21T08:47:25.638Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2023-07-31T15:34:13.627Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.