CVE-2023-3817

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.

• openssl openssl (>= 3.0.0 < 3.0.10) • openssl openssl (>= 3.1.0 < 3.1.2) • openssl openssl 1.0.2 • openssl openssl 1.0.2a • openssl openssl 1.0.2b • openssl openssl 1.0.2c • openssl openssl 1.0.2d • openssl openssl 1.0.2e • openssl openssl 1.0.2f • openssl openssl 1.0.2g • openssl openssl 1.0.2h • openssl openssl 1.0.2i • openssl openssl 1.0.2j • openssl openssl 1.0.2k • openssl openssl 1.0.2l • openssl openssl 1.0.2m • openssl openssl 1.0.2n • openssl openssl 1.0.2o • openssl openssl 1.0.2p • openssl openssl 1.0.2q • openssl openssl 1.0.2r • openssl openssl 1.0.2s • openssl openssl 1.0.2t • openssl openssl 1.0.2u • openssl openssl 1.0.2v • openssl openssl 1.0.2w • openssl openssl 1.0.2x • openssl openssl 1.0.2y • openssl openssl 1.0.2za • openssl openssl 1.0.2zb • openssl openssl 1.0.2zc • openssl openssl 1.0.2zd • openssl openssl 1.0.2ze • openssl openssl 1.0.2zf • openssl openssl 1.0.2zg • openssl openssl 1.0.2zh • openssl openssl 1.1.1 • openssl openssl 1.1.1a • openssl openssl 1.1.1b • openssl openssl 1.1.1c • openssl openssl 1.1.1d • openssl openssl 1.1.1e • openssl openssl 1.1.1f • openssl openssl 1.1.1g • openssl openssl 1.1.1h • openssl openssl 1.1.1i • openssl openssl 1.1.1j • openssl openssl 1.1.1k • openssl openssl 1.1.1l • openssl openssl 1.1.1m • openssl openssl 1.1.1n • openssl openssl 1.1.1o • openssl openssl 1.1.1p • openssl openssl 1.1.1q • openssl openssl 1.1.1r • openssl openssl 1.1.1s • openssl openssl 1.1.1t • openssl openssl 1.1.1u