CVE-2023-3817

*** Pendiente de traducción *** Issue summary: Checking excessively long DH keys or parameters may be very slow.<br /> <br /> Impact summary: Applications that use the functions DH_check(), DH_check_ex()<br /> or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long<br /> delays. Where the key or parameters that are being checked have been obtained<br /> from an untrusted source this may lead to a Denial of Service.<br /> <br /> The function DH_check() performs various checks on DH parameters. After fixing<br /> CVE-2023-3446 it was discovered that a large q parameter value can also trigger<br /> an overly long computation during some of these checks. A correct q value,<br /> if present, cannot be larger than the modulus p parameter, thus it is<br /> unnecessary to perform these checks if q is larger than p.<br /> <br /> An application that calls DH_check() and supplies a key or parameters obtained<br /> from an untrusted source could be vulnerable to a Denial of Service attack.<br /> <br /> The function DH_check() is itself called by a number of other OpenSSL functions.<br /> An application calling any of those other functions may similarly be affected.<br /> The other functions affected by this are DH_check_ex() and<br /> EVP_PKEY_param_check().<br /> <br /> Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications<br /> when using the "-check" option.<br /> <br /> The OpenSSL SSL/TLS implementation is not affected by this issue.<br /> <br /> The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.