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Parse HelloVerifyRequest: avoid buffer overread on the cookie

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In ssl_parse_hello_verify_request, we print cookie_len bytes without
checking that there are that many bytes left in ssl->in_msg. This
could potentially log data outside the received message (not a big
deal) and could potentially read from memory outside of the receive
buffer (which would be a remotely exploitable crash).
This commit is contained in:
Gilles Peskine 2019-09-27 14:00:36 +02:00
parent 2a7030429b
commit b51130dd5c
1 changed files with 1 additions and 2 deletions
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3
library/ssl_cli.c
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@ -1605,8 +1605,6 @@ static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl )
} }
cookie_len = *p++; cookie_len = *p++;
MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len );
if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len ) if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len )
{ {
MBEDTLS_SSL_DEBUG_MSG( 1, MBEDTLS_SSL_DEBUG_MSG( 1,
@ -1615,6 +1613,7 @@ static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
} }
MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len );
mbedtls_free( ssl->handshake->verify_cookie ); mbedtls_free( ssl->handshake->verify_cookie );