cve-2023-3446
Vulnerability from cvelistv5
Published
2023-07-19 11:31
Modified
2024-10-14 14:55
Severity ?
Summary
Excessive time spent checking DH keys and parameters
Impacted products
OpenSSLOpenSSL
Show details on NVD website


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              "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."
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