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Fix potential random malloc in pem_read()

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Manuel Pégourié-Gonnard 2015-09-28 18:27:15 +02:00
parent 59efb6a1b9
commit 9bf29bee22
3 changed files with 10 additions and 0 deletions
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4
ChangeLog
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@ -11,6 +11,10 @@ Security
but might be in other uses. On 32 bit machines, requires reading a string
of close to or larger than 1GB to exploit; on 64 bit machines, would require
reading a string of close to or larger than 2^62 bytes.
* Fix potential random memory allocation in mbedtls_pem_read_buffer()
on crafted PEM input data. Found an fix provided by Guid Vranken.
Not triggerable remotely in TLS. Triggerable remotely if you accept PEM
data from an untrusted source.
= mbed TLS 1.3.13 reladsed 2015-09-17

3
library/base64.c
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@ -190,7 +190,10 @@ int base64_decode( unsigned char *dst, size_t *dlen,
}
if( n == 0 )
{
*dlen = 0;
return( 0 );
}
n = ( ( n * 6 ) + 7 ) >> 3;
n -= j;

3
library/pem.c
View file

@ -317,6 +317,9 @@ int pem_read_buffer( pem_context *ctx, const char *header, const char *footer,
( POLARSSL_AES_C || POLARSSL_DES_C ) */
}
if( s1 == s2 )
return( POLARSSL_ERR_PEM_INVALID_DATA );
len = 0;
ret = base64_decode( NULL, &len, s1, s2 - s1 );