Fixed an authentication bypass issue in SSL/TLS. When the TLS
authentication mode was set to 'optional',
mbedtls_ssl_get_verify_result() would incorrectly return 0 when the
peer's X.509 certificate chain had more than
MBEDTLS_X509_MAX_INTERMEDIATE_CA intermediates (default: 8), even when
it was not trusted. This could be triggered remotely on both the client
and server side. (Note, with the authentication mode set by
mbedtls_ssl_conf_authmode()to be 'required' (the default), the handshake
was correctly aborted).
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Tested-by: Magnus Kroken <mkroken@gmail.com>
Since mbedtls 2.5.1, SHA1 has been disallowed in TLS certificates.
This breaks openvpn clients that try to connect to servers that
present a TLS certificate signed with SHA1, which is fairly common.
Run-tested with openvpn-mbedtls 2.4.3, LEDE 17.01.2, on ar71xx.
Fixes: FS#942
Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>
Fixes some security issues (no remote exploits), and introduces
some changes. See release notes for details:
https://tls.mbed.org/tech-updates/releases/mbedtls-2.5.1-2.1.8-and-1.3.20-released
* Fixes an unlimited overread of heap-based buffers in mbedtls_ssl_read()
* Adds exponent blinding to RSA private operations
* Wipes stack buffers in RSA private key operations (rsa_rsaes_pkcs1_v15_decrypt(), rsa_rsaes_oaep_decrypt())
* Removes SHA-1 and RIPEMD-160 from the default hash algorithms for certificate verification.
* Fixes offset in FALLBACK_SCSV parsing that caused TLS server to fail to detect it sometimes.
* Tighten parsing of RSA PKCS#1 v1.5 signatures, to avoid a potential Bleichenbacher/BERserk-style attack.
Signed-off-by: Magnus Kroken <mkroken@gmail.com>
This fixes the following security problems:
* CVE-2017-2784: Freeing of memory allocated on stack when validating a public key with a secp224k1 curve
* SLOTH vulnerability
* Denial of Service through Certificate Revocation List
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This option is required by OpenVPN, and OpenVPN 2.4 uses mbedTLS 2.x.
DHM_C is also already enabled in the PolarSSL 1.3.x config.h.
Signed-off-by: Magnus Kroken <mkroken@gmail.com>
