CVE-2023-3446 (GCVE-0-2023-3446)

Vulnerability from cvelistv5 – Published: 2023-07-19 11:31 – Updated: 2025-04-23 16:20
VLAI
Title
Excessive time spent checking DH keys and parameters
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. One of those checks confirms that the modulus ('p' parameter) is not too large. Trying to use a very large modulus is slow and OpenSSL will not normally use a modulus which is over 10,000 bits in length. However the DH_check() function checks numerous aspects of the key or parameters that have been supplied. Some of those checks use the supplied modulus value even if it has already been found to be too large. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulernable 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
2023-07-13 00:00
Credits
OSSfuzz Matt Caswell
Show details on NVD website
To clipboard 

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{\"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-2023-3446\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-04-23T13:26:22.087194Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-04-23T14:38:13.921Z\"}}], \"cna\": {\"title\": \"Excessive time spent checking DH keys and parameters\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"user\": \"00000000-0000-4000-9000-000000000000\", \"value\": \"OSSfuzz\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"user\": \"00000000-0000-4000-9000-000000000000\", \"value\": \"Matt Caswell\"}], \"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\": \"2023-07-13T00:00:00.000Z\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20230719.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc9867c1e03c22ebf56943be205202e576aabf23\", \"name\": \"3.1.2 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=1fa20cf2f506113c761777127a38bce5068740eb\", \"name\": \"3.0.10 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8780a896543a654e757db1b9396383f9d8095528\", \"name\": \"1.1.1v git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9a0a4d3c1e7138915563c0df4fe6a3f9377b839c\", \"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. One of those\\nchecks confirms that the modulus (\u0027p\u0027 parameter) is not too large. Trying to use\\na very large modulus is slow and OpenSSL will not normally use a modulus which\\nis over 10,000 bits in length.\\n\\nHowever the DH_check() function checks numerous aspects of the key or parameters\\nthat have been supplied. Some of those checks use the supplied modulus value\\neven if it has already been found to be too large.\\n\\nAn application that calls DH_check() and supplies a key or parameters obtained\\nfrom an untrusted source could be vulernable 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 \u0027-check\u0027 option.\\n\\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\\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. One of those\u003cbr\u003echecks confirms that the modulus (\u0027p\u0027 parameter) is not too large. Trying to use\u003cbr\u003ea very large modulus is slow and OpenSSL will not normally use a modulus which\u003cbr\u003eis over 10,000 bits in length.\u003cbr\u003e\u003cbr\u003eHowever the DH_check() function checks numerous aspects of the key or parameters\u003cbr\u003ethat have been supplied. Some of those checks use the supplied modulus value\u003cbr\u003eeven if it has already been found to be too large.\u003cbr\u003e\u003cbr\u003eAn application that calls DH_check() and supplies a key or parameters obtained\u003cbr\u003efrom an untrusted source could be vulernable 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 \u0027-check\u0027 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\": \"2024-10-14T14:55:47.238Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-3446\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-04-23T16:20:00.400Z\", \"dateReserved\": \"2023-06-28T14:21:39.968Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2023-07-19T11:31:34.994Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.