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Merge remote-tracking branch 'restricted/pr/470' into development-restricted

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This commit is contained in:
Simon Butcher 2018-08-28 15:26:11 +01:00
parent 7f85563f9b 463928a74b
commit 129fa82908
2 changed files with 7 additions and 7 deletions
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4
ChangeLog
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@ -6,6 +6,10 @@ Security
* Fix a potential memory leak in mbedtls_ssl_setup( ) function. An allocation
failure could leave an unreleased buffer. A handshake init failure would
lead to leaving two unreleased buffers.
* Fix an issue in the X.509 module which could lead to a buffer overread
during certificate extensions parsing. In case of receiving malformed
input (extensions length field equal to 0), an illegal read of one byte
beyond the input buffer is made. Found and analyzed by Nathan Crandall.
Features
* Add support for fragmentation of outgoing DTLS handshake messages. This

10
library/x509_crt.c
View file

@ -579,18 +579,14 @@ static int x509_get_crt_ext( unsigned char **p,
end_ext_data = *p + len;
/* Get extension ID */
extn_oid.tag = **p;
if( ( ret = mbedtls_asn1_get_tag( p, end, &extn_oid.len, MBEDTLS_ASN1_OID ) ) != 0 )
if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len,
MBEDTLS_ASN1_OID ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
extn_oid.tag = MBEDTLS_ASN1_OID;
extn_oid.p = *p;
*p += extn_oid.len;
if( ( end - *p ) < 1 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
/* Get optional critical */
if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )