{"schema_version":"1.7.5","id":"UBUNTU-CVE-2023-3817","published":"2023-07-31T16:15:00Z","modified":"2026-04-22T14:09:01.844417Z","related":["USN-6435-1","USN-6435-2","USN-6450-1","USN-6709-1","USN-7894-1"],"upstream":["CVE-2023-3817"],"details":"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.","affected":[{"package":{"name":"openssl","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.20+esm10?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2g-1ubuntu4.20+esm10"}]}],"versions":["1.0.2d-0ubuntu1","1.0.2d-0ubuntu2","1.0.2e-1ubuntu1","1.0.2f-2ubuntu1","1.0.2g-1ubuntu2","1.0.2g-1ubuntu3","1.0.2g-1ubuntu4","1.0.2g-1ubuntu4.1","1.0.2g-1ubuntu4.2","1.0.2g-1ubuntu4.4","1.0.2g-1ubuntu4.5","1.0.2g-1ubuntu4.6","1.0.2g-1ubuntu4.8","1.0.2g-1ubuntu4.9","1.0.2g-1ubuntu4.10","1.0.2g-1ubuntu4.11","1.0.2g-1ubuntu4.12","1.0.2g-1ubuntu4.13","1.0.2g-1ubuntu4.14","1.0.2g-1ubuntu4.15","1.0.2g-1ubuntu4.16","1.0.2g-1ubuntu4.17","1.0.2g-1ubuntu4.18","1.0.2g-1ubuntu4.19","1.0.2g-1ubuntu4.20","1.0.2g-1ubuntu4.20+esm1","1.0.2g-1ubuntu4.20+esm2","1.0.2g-1ubuntu4.20+esm3","1.0.2g-1ubuntu4.20+esm4","1.0.2g-1ubuntu4.20+esm5","1.0.2g-1ubuntu4.20+esm6","1.0.2g-1ubuntu4.20+esm7","1.0.2g-1ubuntu4.20+esm9"],"ecosystem_specific":{"availability":"Available 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severity"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-3817.json"}},{"package":{"name":"openssl","ecosystem":"Ubuntu:Pro:FIPS:16.04:LTS","purl":"pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.fips.4.20.10?arch=source&distro=fips-updates/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2g-1ubuntu4.fips.4.20.10"}]}],"versions":["1.0.2g-1ubuntu4.fips.4.9.1","1.0.2g-1ubuntu4.fips.4.13.1","1.0.2g-1ubuntu4.fips.4.15.1","1.0.2g-1ubuntu4.fips.4.16.1","1.0.2g-1ubuntu4.fips.4.17.1","1.0.2g-1ubuntu4.fips.4.18.1","1.0.2g-1ubuntu4.fips.4.19.3","1.0.2g-1ubuntu4.fips.4.20.1","1.0.2g-1ubuntu4.fips.4.20.2","1.0.2g-1ubuntu4.fips.4.20.3","1.0.2g-1ubuntu4.fips.4.20.6","1.0.2g-1ubuntu4.fips.4.20.7","1.0.2g-1ubuntu4.fips.4.20.9"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: 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