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Ralf S. Engelschall
committed
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This is a high-level summary of the most important changes.
For a full list of changes, see the git commit log; for example,
https://github.com/openssl/openssl/commits/ and pick the appropriate
release branch.
Changes between 1.1.1c and 1.1.1d [xx XXX xxxx]
*) For built-in EC curves, ensure an EC_GROUP built from the curve name is
used even when parsing explicit parameters, when loading a serialized key
or calling `EC_GROUP_new_from_ecpkparameters()`/
`EC_GROUP_new_from_ecparameters()`.
This prevents bypass of security hardening and performance gains,
especially for curves with specialized EC_METHODs.
By default, if a key encoded with explicit parameters is loaded and later
serialized, the output is still encoded with explicit parameters, even if
internally a "named" EC_GROUP is used for computation.
[Nicola Tuveri]
*) Compute ECC cofactors if not provided during EC_GROUP construction. Before
this change, EC_GROUP_set_generator would accept order and/or cofactor as
NULL. After this change, only the cofactor parameter can be NULL. It also
does some minimal sanity checks on the passed order.
[Billy Bob Brumley]
*) Early start up entropy quality from the DEVRANDOM seed source has been
improved for older Linux systems. The RAND subsystem will wait for
/dev/random to be producing output before seeding from /dev/urandom.
The seeded state is stored for future library initialisations using
a system global shared memory segment. The shared memory identifier
can be configured by defining OPENSSL_RAND_SEED_DEVRANDOM_SHM_ID to
the desired value. The default identifier is 114.
[Paul Dale]
*) Correct the extended master secret constant on EBCDIC systems. Without this
fix TLS connections between an EBCDIC system and a non-EBCDIC system that
negotiate EMS will fail. Unfortunately this also means that TLS connections
between EBCDIC systems with this fix, and EBCDIC systems without this
fix will fail if they negotiate EMS.
[Matt Caswell]
*) Use Windows installation paths in the mingw builds
Mingw isn't a POSIX environment per se, which means that Windows
paths should be used for installation.
(CVE-2019-1552)
[Richard Levitte]
*) Changed DH parameters to generate the order q subgroup instead of 2q.
Previously generated DH parameters are still accepted by DH_check
but DH_generate_key works around that by clearing bit 0 of the
private key for those. This avoids leaking bit 0 of the private key.
[Bernd Edlinger]
*) Significantly reduce secure memory usage by the randomness pools.
[Paul Dale]
Dr. Matthias St. Pierre
committed
*) Revert the DEVRANDOM_WAIT feature for Linux systems
The DEVRANDOM_WAIT feature added a select() call to wait for the
/dev/random device to become readable before reading from the
/dev/urandom device.
It turned out that this change had negative side effects on
performance which were not acceptable. After some discussion it
was decided to revert this feature and leave it up to the OS
resp. the platform maintainer to ensure a proper initialization
during early boot time.
Changes between 1.1.1b and 1.1.1c [28 May 2019]
*) Add build tests for C++. These are generated files that only do one
thing, to include one public OpenSSL head file each. This tests that
the public header files can be usefully included in a C++ application.
This test isn't enabled by default. It can be enabled with the option
'enable-buildtest-c++'.
[Richard Levitte]
*) Enable SHA3 pre-hashing for ECDSA and DSA.
[Patrick Steuer]
*) Change the default RSA, DSA and DH size to 2048 bit instead of 1024.
This changes the size when using the genpkey app when no size is given. It
fixes an omission in earlier changes that changed all RSA, DSA and DH
generation apps to use 2048 bits by default.
[Kurt Roeckx]
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*) Reorganize the manual pages to consistently have RETURN VALUES,
EXAMPLES, SEE ALSO and HISTORY come in that order, and adjust
util/fix-doc-nits accordingly.
[Paul Yang, Joshua Lock]
*) Add the missing accessor EVP_PKEY_get0_engine()
[Matt Caswell]
*) Have apps like 's_client' and 's_server' output the signature scheme
along with other cipher suite parameters when debugging.
[Lorinczy Zsigmond]
*) Make OPENSSL_config() error agnostic again.
[Richard Levitte]
*) Do the error handling in RSA decryption constant time.
[Bernd Edlinger]
*) Prevent over long nonces in ChaCha20-Poly1305.
ChaCha20-Poly1305 is an AEAD cipher, and requires a unique nonce input
for every encryption operation. RFC 7539 specifies that the nonce value
(IV) should be 96 bits (12 bytes). OpenSSL allows a variable nonce length
and front pads the nonce with 0 bytes if it is less than 12
bytes. However it also incorrectly allows a nonce to be set of up to 16
bytes. In this case only the last 12 bytes are significant and any
additional leading bytes are ignored.
It is a requirement of using this cipher that nonce values are
unique. Messages encrypted using a reused nonce value are susceptible to
serious confidentiality and integrity attacks. If an application changes
the default nonce length to be longer than 12 bytes and then makes a
change to the leading bytes of the nonce expecting the new value to be a
new unique nonce then such an application could inadvertently encrypt
messages with a reused nonce.
Additionally the ignored bytes in a long nonce are not covered by the
integrity guarantee of this cipher. Any application that relies on the
integrity of these ignored leading bytes of a long nonce may be further
affected. Any OpenSSL internal use of this cipher, including in SSL/TLS,
is safe because no such use sets such a long nonce value. However user
applications that use this cipher directly and set a non-default nonce
length to be longer than 12 bytes may be vulnerable.
This issue was reported to OpenSSL on 16th of March 2019 by Joran Dirk
Greef of Ronomon.
(CVE-2019-1543)
[Matt Caswell]
Dr. Matthias St. Pierre
committed
*) Add DEVRANDOM_WAIT feature for Linux systems
On older Linux systems where the getrandom() system call is not available,
OpenSSL normally uses the /dev/urandom device for seeding its CSPRNG.
Contrary to getrandom(), the /dev/urandom device will not block during
early boot when the kernel CSPRNG has not been seeded yet.
To mitigate this known weakness, use select() to wait for /dev/random to
become readable before reading from /dev/urandom.
*) Ensure that SM2 only uses SM3 as digest algorithm
[Paul Yang]
Changes between 1.1.1a and 1.1.1b [26 Feb 2019]
*) Added SCA hardening for modular field inversion in EC_GROUP through
a new dedicated field_inv() pointer in EC_METHOD.
This also addresses a leakage affecting conversions from projective
to affine coordinates.
[Billy Bob Brumley, Nicola Tuveri]
*) Change the info callback signals for the start and end of a post-handshake
message exchange in TLSv1.3. In 1.1.1/1.1.1a we used SSL_CB_HANDSHAKE_START
and SSL_CB_HANDSHAKE_DONE. Experience has shown that many applications get
confused by this and assume that a TLSv1.2 renegotiation has started. This
can break KeyUpdate handling. Instead we no longer signal the start and end
of a post handshake message exchange (although the messages themselves are
still signalled). This could break some applications that were expecting
the old signals. However without this KeyUpdate is not usable for many
applications.
[Matt Caswell]
*) Fix a bug in the computation of the endpoint-pair shared secret used
by DTLS over SCTP. This breaks interoperability with older versions
of OpenSSL like OpenSSL 1.1.0 and OpenSSL 1.0.2. There is a runtime
switch SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG (off by default) enabling
interoperability with such broken implementations. However, enabling
this switch breaks interoperability with correct implementations.
*) Fix a use after free bug in d2i_X509_PUBKEY when overwriting a
re-used X509_PUBKEY object if the second PUBKEY is malformed.
[Bernd Edlinger]
*) Move strictness check from EVP_PKEY_asn1_new() to EVP_PKEY_asn1_add0().
[Richard Levitte]
*) Remove the 'dist' target and add a tarball building script. The
'dist' target has fallen out of use, and it shouldn't be
necessary to configure just to create a source distribution.
[Richard Levitte]
Changes between 1.1.1 and 1.1.1a [20 Nov 2018]
*) Timing vulnerability in DSA signature generation
The OpenSSL DSA signature algorithm has been shown to be vulnerable to a
timing side channel attack. An attacker could use variations in the signing
algorithm to recover the private key.
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