[3.7] openssl: Multiple vulnerabilities (CVE-2017-3737, CVE-2017-3738)
CVE-2017-3737: Read/write after SSL object in error state
OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an “error
mechanism. The intent was that if a fatal error occurred during a handshake then
OpenSSL would move into the error state and would immediately fail if you
attempted to continue the handshake. This works as designed for the explicit
handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()),
however due to a bug it does not work correctly if SSL_read() or SSL_write() is
called directly. In that scenario, if the handshake fails then a fatal error
will be returned in the initial function call. If SSL_read()/SSL_write() is
subsequently called by the application for the same SSL object then it will
succeed and the data is passed without being decrypted/encrypted directly from
the SSL/TLS record layer.
CVE-2017-3738: rsaz_1024_mul_avx2 overflow bug on x86_64
There is an overflow bug in the AVX2 Montgomery multiplication
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.
(from redmine: issue id 8274, created on 2017-12-13, closed on 2017-12-18)
main/openssl: security upgrade to 1.0.2n fixes #8274 CVE-2017-3737 CVE-2017-3738 (cherry picked from commit d2d350f8a099c9ed303f00888e05626662e5c7f6)