QID 355881

issue summary: the aes-siv cipher implementation contains a bug that causes it to ignore empty associated data entries which are unauthenticated as a consequence. impact summary: applications that use the aes-siv algorithm and want to authenticate empty data entries as associated data can be mislead by removing adding or reordering such empty entries as these are ignored by the openssl implementation.
We are currently unaware of any such applications. the aes-siv algorithm allows for authentication of multiple associated data entries along with the encryption.
To authenticate empty data the application has to call evp_encryptupdate() (or evp_cipherupdate()) with null pointer as the output buffer and 0 as the input buffer length. the aes-siv implementation in openssl just returns success for such a call instead of performing the associated data authentication operation. the empty data thus will not be authenticated. as this issue does not affect non-empty associated data authentication and we expect it to be rare for an application to use empty associated data entries this is qualified as low severity issue. (
( CVE-2023-2975) 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.
One of those checks confirms that the modulus (p parameter) is not too large.
( CVE-2023-3817)

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.