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Fix potential integer overflow parsing DER CRL

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This patch prevents a potential signed integer overflow during the
CRL version verification checks.
This commit is contained in:
Andres AG 2017-02-10 14:39:58 +00:00 committed by Simon Butcher
parent d922c78aa4
commit 4f753c1186
2 changed files with 7 additions and 3 deletions
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4
ChangeLog
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@ -13,6 +13,10 @@ Bugfix
Found by redplait #590
* Add MBEDTLS_MPI_CHK to check for error value of mbedtls_mpi_fill_random.
Reported and fix suggested by guidovranken in #740
* Fix a potential integer overflow in the version verification for DER
encoded X509 CRLs. The overflow would enable maliciously constructed CRLs
to bypass the version verification check. Found by Peng Li/Yueh-Hsun Lin,
KNOX Security, Samsung Research America
Features
* Add the functions mbedtls_platform_setup() and mbedtls_platform_teardown()

6
library/x509_crl.c
View file

@ -352,14 +352,14 @@ int mbedtls_x509_crl_parse_der( mbedtls_x509_crl *chain,
return( ret );
}
crl->version++;
if( crl->version > 2 )
if( crl->version < 0 || crl->version > 1 )
{
mbedtls_x509_crl_free( crl );
return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
}
crl->version++;
if( ( ret = mbedtls_x509_get_sig_alg( &crl->sig_oid, &sig_params1,
&crl->sig_md, &crl->sig_pk,
&crl->sig_opts ) ) != 0 )