[Change-log](https://www.openssl.org/news/cl111.txt):
> Changes between 1.1.1s and 1.1.1t [7 Feb 2023]
>
> *) Fixed X.400 address type confusion in X.509 GeneralName.
>
> There is a type confusion vulnerability relating to X.400 address processing
> inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING
> but subsequently interpreted by GENERAL_NAME_cmp as an ASN1_TYPE. This
> vulnerability may allow an attacker who can provide a certificate chain and
> CRL (neither of which need have a valid signature) to pass arbitrary
> pointers to a memcmp call, creating a possible read primitive, subject to
> some constraints. Refer to the advisory for more information. Thanks to
> David Benjamin for discovering this issue. (CVE-2023-0286)
>
> This issue has been fixed by changing the public header file definition of
> GENERAL_NAME so that x400Address reflects the implementation. It was not
> possible for any existing application to successfully use the existing
> definition; however, if any application references the x400Address field
> (e.g. in dead code), note that the type of this field has changed. There is
> no ABI change.
> [Hugo Landau]
>
> *) Fixed Use-after-free following BIO_new_NDEF.
>
> The public API function BIO_new_NDEF is a helper function used for
> streaming ASN.1 data via a BIO. It is primarily used internally to OpenSSL
> to support the SMIME, CMS and PKCS7 streaming capabilities, but may also
> be called directly by end user applications.
>
> The function receives a BIO from the caller, prepends a new BIO_f_asn1
> filter BIO onto the front of it to form a BIO chain, and then returns
> the new head of the BIO chain to the caller. Under certain conditions,
> for example if a CMS recipient public key is invalid, the new filter BIO
> is freed and the function returns a NULL result indicating a failure.
> However, in this case, the BIO chain is not properly cleaned up and the
> BIO passed by the caller still retains internal pointers to the previously
> freed filter BIO. If the caller then goes on to call BIO_pop() on the BIO
> then a use-after-free will occur. This will most likely result in a crash.
> (CVE-2023-0215)
> [Viktor Dukhovni, Matt Caswell]
>
> *) Fixed Double free after calling PEM_read_bio_ex.
>
> The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and
> decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload
> data. If the function succeeds then the "name_out", "header" and "data"
> arguments are populated with pointers to buffers containing the relevant
> decoded data. The caller is responsible for freeing those buffers. It is
> possible to construct a PEM file that results in 0 bytes of payload data.
> In this case PEM_read_bio_ex() will return a failure code but will populate
> the header argument with a pointer to a buffer that has already been freed.
> If the caller also frees this buffer then a double free will occur. This
> will most likely lead to a crash.
>
> The functions PEM_read_bio() and PEM_read() are simple wrappers around
> PEM_read_bio_ex() and therefore these functions are also directly affected.
>
> These functions are also called indirectly by a number of other OpenSSL
> functions including PEM_X509_INFO_read_bio_ex() and
> SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL
> internal uses of these functions are not vulnerable because the caller does
> not free the header argument if PEM_read_bio_ex() returns a failure code.
> (CVE-2022-4450)
> [Kurt Roeckx, Matt Caswell]
>
> *) Fixed Timing Oracle in RSA Decryption.
>
> A timing based side channel exists in the OpenSSL RSA Decryption
> implementation which could be sufficient to recover a plaintext across
> a network in a Bleichenbacher style attack. To achieve a successful
> decryption an attacker would have to be able to send a very large number
> of trial messages for decryption. The vulnerability affects all RSA padding
> modes: PKCS#1 v1.5, RSA-OEAP and RSASVE.
> (CVE-2022-4304)
> [Dmitry Belyavsky, Hubert Kario]