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Merge remote-tracking branch 'restricted/pr/520' into development-restricted-proposed

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This commit is contained in:
Simon Butcher 2018-11-07 13:04:33 +00:00
commit de13963d66
2 changed files with 7 additions and 2 deletions
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5
ChangeLog
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@ -10,6 +10,11 @@ Security
one using PrintableString and the other UTF8String) or one using PrintableString and the other UTF8String) or
in the choice of upper and lower case. Reported by in the choice of upper and lower case. Reported by
HenrikRosenquistAndersson in #1784. HenrikRosenquistAndersson in #1784.
* Fix a flawed bounds check in server PSK hint parsing. In case the
incoming message buffer was placed within the first 64KB of address
space and a PSK-(EC)DHE ciphersuite was used, this allowed an attacker
to trigger a memory access up to 64KB beyond the incoming message buffer,
potentially leading to application crash or information disclosure.
* Fix mbedtls_mpi_is_prime() to use more rounds of probabilistic testing. The * Fix mbedtls_mpi_is_prime() to use more rounds of probabilistic testing. The
previous settings for the number of rounds made it practical for an previous settings for the number of rounds made it practical for an
adversary to construct non-primes that would be erroneously accepted as adversary to construct non-primes that would be erroneously accepted as

4
library/ssl_cli.c
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@ -2109,7 +2109,7 @@ static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
* *
* opaque psk_identity_hint<0..2^16-1>; * opaque psk_identity_hint<0..2^16-1>;
*/ */
if( (*p) > end - 2 ) if( end - (*p) < 2 )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message "
"(psk_identity_hint length)" ) ); "(psk_identity_hint length)" ) );
@ -2118,7 +2118,7 @@ static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
len = (*p)[0] << 8 | (*p)[1]; len = (*p)[0] << 8 | (*p)[1];
*p += 2; *p += 2;
if( (*p) > end - len ) if( end - (*p) < (int) len )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message "
"(psk_identity_hint length)" ) ); "(psk_identity_hint length)" ) );