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Fix length checking for AEAD ciphersuites

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This commit is contained in:
Paul Bakker 2014-07-08 17:51:29 +02:00
parent 312da33ef1
commit 5bad6afd8c
2 changed files with 16 additions and 5 deletions
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3
ChangeLog
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@ -23,6 +23,9 @@ Security
* Forbid sequence number wrapping
* Prevent potential NULL pointer dereference in ssl_read_record() (found by
TrustInSoft)
* Fix length checking for AEAD ciphersuites (found by Codenomicon).
It was possible to crash the server (and client) using crafted messages
when a GCM suite was chosen.
Bugfix
* Fixed X.509 hostname comparison (with non-regular characters)

18
library/ssl_tls.c
View File

@ -1254,6 +1254,9 @@ static int ssl_decrypt_buf( ssl_context *ssl )
size_t dec_msglen;
unsigned char add_data[13];
int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
unsigned char taglen = 16;
unsigned char explicit_iv_len = ssl->transform_in->ivlen -
ssl->transform_in->fixed_ivlen;
#if defined(POLARSSL_AES_C) && defined(POLARSSL_GCM_C)
if( ssl->session_in->ciphersuite == TLS_RSA_WITH_AES_128_GCM_SHA256 ||
@ -1261,11 +1264,16 @@ static int ssl_decrypt_buf( ssl_context *ssl )
ssl->session_in->ciphersuite == TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 ||
ssl->session_in->ciphersuite == TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 )
{
dec_msglen = ssl->in_msglen - ( ssl->transform_in->ivlen -
ssl->transform_in->fixed_ivlen );
dec_msglen -= 16;
dec_msg = ssl->in_msg + ( ssl->transform_in->ivlen -
ssl->transform_in->fixed_ivlen );
if( ssl->in_msglen < explicit_iv_len + taglen )
{
SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
"+ taglen (%d)", ssl->in_msglen,
explicit_iv_len, taglen ) );
return( POLARSSL_ERR_SSL_INVALID_MAC );
}
dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
dec_msg = ssl->in_msg + explicit_iv_len;
dec_msg_result = ssl->in_msg;
ssl->in_msglen = dec_msglen;