While DH_check() performs all the necessary checks (as of CVE-2023-3817), DH_check_pub_key() doesn’t make any of these checks, and is therefore vulnerable for excessively large P and Q parameters. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. Likewise, applications that use DH_check_pub_key(), DH_check_pub_key_ex() or EVP_PKEY_public_check() to check an X9.42 DH key or X9.42 DH parameters may experience long delays. Impact summary: Applications that use the functions DH_generate_key() to generate an X9.42 DH key may experience long delays. Issue summary: Generating excessively long X9.42 DH keys or checking excessively long X9.42 DH keys or parameters may be very slow. Extended support is available for 1.0.2 from OpenSSL Software Services for premium support customers. Note: All OpenSSL versions before 1.1.1 are out of support and no longer receiving updates. If you think you have found a security bug in OpenSSL, please report it to us.
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