branches: 1.1.1.1.2;
*) Constructed ASN.1 types with a recursive definition could exceed the stack

Constructed ASN.1 types with a recursive definition (such as can be found
in PKCS7) could eventually exceed the stack given malicious input with
excessive recursion. This could result in a Denial Of Service attack. There
are no such structures used within SSL/TLS that come from untrusted sources
so this is considered safe.

This issue was reported to OpenSSL on 4th January 2018 by the OSS-fuzz
project.
(CVE-2018-0739)
[Matt Caswell]

*) Incorrect CRYPTO_memcmp on HP-UX PA-RISC

Because of an implementation bug the PA-RISC CRYPTO_memcmp function is
effectively reduced to only comparing the least significant bit of each
byte. This allows an attacker to forge messages that would be considered as
authenticated in an amount of tries lower than that guaranteed by the
security claims of the scheme. The module can only be compiled by the
HP-UX assembler, so that only HP-UX PA-RISC targets are affected.

This issue was reported to OpenSSL on 2nd March 2018 by Peter Waltenberg
(IBM).
(CVE-2018-0733)
[Andy Polyakov]

*) Add a build target 'build_all_generated', to build all generated files
and only that. This can be used to prepare everything that requires
things like perl for a system that lacks perl and then move everything
to that system and do the rest of the build there.
[Richard Levitte]

*) Backport SSL_OP_NO_RENGOTIATION

OpenSSL 1.0.2 and below had the ability to disable renegotiation using the
(undocumented) SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS flag. Due to the opacity
changes this is no longer possible in 1.1.0. Therefore the new
SSL_OP_NO_RENEGOTIATION option from 1.1.1-dev has been backported to
1.1.0 to provide equivalent functionality.

Note that if an application built against 1.1.0h headers (or above) is run
using an older version of 1.1.0 (prior to 1.1.0h) then the option will be
accepted but nothing will happen, i.e. renegotiation will not be prevented.
[Matt Caswell]

*) Removed the OS390-Unix config target. It relied on a script that doesn't
exist.
[Rich Salz]

*) rsaz_1024_mul_avx2 overflow bug on x86_64

There is an overflow bug in the AVX2 Montgomery multiplication procedure
used in exponentiation with 1024-bit moduli. No EC algorithms are affected.
Analysis suggests that attacks against RSA and DSA as a result of this
defect would be very difficult to perform and are not believed likely.
Attacks against DH1024 are considered just feasible, because most of the
work necessary to deduce information about a private key may be performed
offline. The amount of resources required for such an attack would be
significant. However, for an attack on TLS to be meaningful, the server
would have to share the DH1024 private key among multiple clients, which is
no longer an option since CVE-2016-0701.

This only affects processors that support the AVX2 but not ADX extensions
like Intel Haswell (4th generation).

This issue was reported to OpenSSL by David Benjamin (Google). The issue
was originally found via the OSS-Fuzz project.
(CVE-2017-3738)
[Andy Polyakov]