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Fix potential stack overflow

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Manuel Pégourié-Gonnard 2014-11-12 01:25:31 +01:00
parent b134060f90
commit d681443f69
2 changed files with 30 additions and 23 deletions
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7
ChangeLog
View file

@ -4,10 +4,13 @@ PolarSSL ChangeLog (Sorted per branch, date)
Security
* Fix remotely-triggerable uninitialised pointer dereference caused by
crafted X.509 certificate (server is not affected if it doesn't ask for a
crafted X.509 certificate (TLS server is not affected if it doesn't ask for a
client certificate) (found using Codenomicon Defensics).
* Fix remotely-triggerable memory leak caused by crafted X.509 certificates
(server is not affected if it doesn't ask for a client certificate)
(TLS server is not affected if it doesn't ask for a client certificate)
(found using Codenomicon Defensics).
* Fix potential stack overflow while parsing crafted X.509 certificates
(TLS server is not affected if it doesn't ask for a client certificate)
(found using Codenomicon Defensics).
Features

46
library/x509.c
View file

@ -421,35 +421,39 @@ int x509_get_name( unsigned char **p, const unsigned char *end,
size_t set_len;
const unsigned char *end_set;
/*
* parse first SET, restricted to 1 element
*/
if( ( ret = asn1_get_tag( p, end, &set_len,
ASN1_CONSTRUCTED | ASN1_SET ) ) != 0 )
return( POLARSSL_ERR_X509_INVALID_NAME + ret );
/* don't use recursion, we'd risk stack overflow if not optimized */
while( 1 )
{
/*
* parse first SET, restricted to 1 element
*/
if( ( ret = asn1_get_tag( p, end, &set_len,
ASN1_CONSTRUCTED | ASN1_SET ) ) != 0 )
return( POLARSSL_ERR_X509_INVALID_NAME + ret );
end_set = *p + set_len;
end_set = *p + set_len;
if( ( ret = x509_get_attr_type_value( p, end_set, cur ) ) != 0 )
return( ret );
if( ( ret = x509_get_attr_type_value( p, end_set, cur ) ) != 0 )
return( ret );
if( *p != end_set )
return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
if( *p != end_set )
return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
/*
* recurse until end of SEQUENCE is reached
*/
if( *p == end )
return( 0 );
/*
* continue until end of SEQUENCE is reached
*/
if( *p == end )
return( 0 );
cur->next = (x509_name *) polarssl_malloc( sizeof( x509_name ) );
cur->next = (x509_name *) polarssl_malloc( sizeof( x509_name ) );
if( cur->next == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
if( cur->next == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
memset( cur->next, 0, sizeof( x509_name ) );
memset( cur->next, 0, sizeof( x509_name ) );
return( x509_get_name( p, end, cur->next ) );
cur = cur->next;
}
}
/*