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Fix potential buffer overflow in asn1write

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Ref: IOTSSL-519
This commit is contained in:
Manuel Pégourié-Gonnard 2015-10-27 11:39:32 +01:00
parent 80e6cffcad
commit 5388eea449
2 changed files with 8 additions and 4 deletions
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4
ChangeLog
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@ -6,6 +6,10 @@ Security
* Fix potential heap corruption on Windows when
x509_crt_parse_path() is passed a path longer than 2GB. Cannot be
triggered remotely. Found by Guido Vranken, Interlworks.
* Fix potential buffer overflow in some asn1_write_xxx() functions.
Cannot be triggered remotely unless you create X.509 certificates based
on untrusted input or write keys of untrusted origin. Found by Guido
Vranken, Interlworks.
= Version 1.2.17 released 2015-10-06

8
library/asn1write.c
View File

@ -78,7 +78,7 @@ int asn1_write_mpi( unsigned char **p, unsigned char *start, mpi *X )
//
len = mpi_size( X );
if( *p - start < (int) len )
if( *p < start || (size_t)( *p - start ) < len )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
(*p) -= len;
@ -127,7 +127,7 @@ int asn1_write_oid( unsigned char **p, unsigned char *start, char *oid )
//
len = strlen( oid );
if( *p - start < (int) len )
if( *p < start || (size_t)( *p - start ) < len )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
(*p) -= len;
@ -203,7 +203,7 @@ int asn1_write_printable_string( unsigned char **p, unsigned char *start,
//
len = strlen( text );
if( *p - start < (int) len )
if( *p < start || (size_t)( *p - start ) < len )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
(*p) -= len;
@ -225,7 +225,7 @@ int asn1_write_ia5_string( unsigned char **p, unsigned char *start,
//
len = strlen( text );
if( *p - start < (int) len )
if( *p < start || (size_t)( *p - start ) < len )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
(*p) -= len;