The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue. The OpenSSL SSL/TLS implementation is not affected by this issue. Also vulnerable are the OpenSSL pkey command line application when using the "-pubcheck" option, as well as the OpenSSL genpkey command line application. The other functions affected by this are DH_check_pub_key_ex(), EVP_PKEY_public_check(), and EVP_PKEY_generate(). An application calling any of those other functions may similarly be affected. DH_generate_key() and DH_check_pub_key() are also called by a number of other OpenSSL functions. An application that calls DH_generate_key() or DH_check_pub_key() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. Likewise, while DH_generate_key() performs a check for an excessively large P, it doesn't check for an excessively large Q. 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. Improper authentication in the SMA100 SSL-VPN virtual office portal allows a remote authenticated attacker to create an identical external domain user using accent characters, resulting in an MFA bypass.īuffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in cgi component in Synology SSL VPN Client before 1.4.7-0687 allows local users to conduct denial-of-service attacks via unspecified vectors.
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