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Merge remote-tracking branch 'upstream-public/pr/1452' into mbedtls-2.1-proposed

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This commit is contained in:
Jaeden Amero 2018-03-14 17:38:21 +00:00
parent 5e533f43ee d3cec99377
commit 4e3629590f
2 changed files with 12 additions and 1 deletions
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4
ChangeLog
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@ -17,6 +17,8 @@ Security
implementation allowed an offline 2^80 brute force attack on the
HMAC key of a single, uninterrupted connection (with no
resumption of the session).
* Fix a buffer overread in ssl_parse_server_key_exchange() that could cause
a crash on invalid input.
Features
* Extend PKCS#8 interface by introducing support for the entire SHA
@ -51,6 +53,8 @@ Bugfix
structure. Do not assume that zeroizing a context is a correct way to
reset it. Found independently by ccli8 on Github.
* In mbedtls_entropy_free(), properly free the message digest context.
* Fix a possible arithmetic overflow in ssl_parse_server_key_exchange()
that could cause a key exchange to fail on valid data.
Changes
* Clarified the documentation of mbedtls_ssl_setup.

9
library/ssl_cli.c
View file

@ -2236,10 +2236,17 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
/*
* Read signature
*/
if( p > end - 2 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
sig_len = ( p[0] << 8 ) | p[1];
p += 2;
if( end != p + sig_len )
if( p != end - sig_len )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );