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Merge branch 'iotssl-1368-unsafe-bounds-check-psk-identity-merge' into development-restricted

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Gilles Peskine 2017-11-23 18:58:30 +01:00
parent bfa8df4c7e dab611a7b1
commit 1a2640c025
2 changed files with 4 additions and 2 deletions
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2
ChangeLog
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@ -8,6 +8,8 @@ Security
Security Initiative, Qualcomm Technologies Inc.
* Fix buffer overflow in RSA-PSS verification when the unmasked
data is all zeros.
* Fix unsafe bounds check in ssl_parse_client_psk_identity() when adding
64kB to the address of the SSL buffer wraps around.
Features
* Allow comments in test data files.

4
library/ssl_srv.c
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@ -3433,7 +3433,7 @@ static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned cha
/*
* Receive client pre-shared key identity name
*/
if( *p + 2 > end )
if( end - *p < 2 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
@ -3442,7 +3442,7 @@ static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned cha
n = ( (*p)[0] << 8 ) | (*p)[1];
*p += 2;
if( n < 1 || n > 65535 || *p + n > end )
if( n < 1 || n > 65535 || n > (size_t) ( end - *p ) )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );