### Changes between 3.0.11 and 3.0.12 [24 Oct 2023]
* Fix incorrect key and IV resizing issues when calling EVP_EncryptInit_ex2(),
EVP_DecryptInit_ex2() or EVP_CipherInit_ex2() with OSSL_PARAM parameters
that alter the key or IV length ([CVE-2023-5363]).
*Paul Dale*
### Changes between 3.0.10 and 3.0.11 [19 Sep 2023]
* Fix POLY1305 MAC implementation corrupting XMM registers on Windows.
The POLY1305 MAC (message authentication code) implementation in OpenSSL
does not save the contents of non-volatile XMM registers on Windows 64
platform when calculating the MAC of data larger than 64 bytes. Before
returning to the caller all the XMM registers are set to zero rather than
restoring their previous content. The vulnerable code is used only on newer
x86_64 processors supporting the AVX512-IFMA instructions.
The consequences of this kind of internal application state corruption can
be various - from no consequences, if the calling application does not
depend on the contents of non-volatile XMM registers at all, to the worst
consequences, where the attacker could get complete control of the
application process. However given the contents of the registers are just
zeroized so the attacker cannot put arbitrary values inside, the most likely
consequence, if any, would be an incorrect result of some application
dependent calculations or a crash leading to a denial of service.
([CVE-2023-4807])
*Bernd Edlinger*
### Changes between 3.0.9 and 3.0.10 [1 Aug 2023]
* Fix excessive time spent checking DH q parameter value.
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.
If DH_check() is called with such q parameter value,
DH_CHECK_INVALID_Q_VALUE return flag is set and the computationally
intensive checks are skipped.
([CVE-2023-3817])
*Tomáš Mráz*
* Fix DH_check() excessive time with over sized modulus.
The function DH_check() performs various checks on DH parameters. One of
those checks confirms that the modulus ("p" parameter) is not too large.
Trying to use a very large modulus is slow and OpenSSL will not normally use
a modulus which is over 10,000 bits in length.
However the DH_check() function checks numerous aspects of the key or
parameters that have been supplied. Some of those checks use the supplied
modulus value even if it has already been found to be too large.
A new limit has been added to DH_check of 32,768 bits. Supplying a
key/parameters with a modulus over this size will simply cause DH_check() to
fail.
([CVE-2023-3446])
*Matt Caswell*
* Do not ignore empty associated data entries with AES-SIV.
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 call
instead of performing the associated data authentication operation.
The empty data thus will not be authenticated. ([CVE-2023-2975])
Thanks to Juerg Wullschleger (Google) for discovering the issue.
The fix changes the authentication tag value and the ciphertext for
applications that use empty associated data entries with AES-SIV.
To decrypt data encrypted with previous versions of OpenSSL the application
has to skip calls to `EVP_DecryptUpdate()` for empty associated data
entries.
*Tomáš Mráz*
9630a006cb