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Prevent SLOTH attacks

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This commit is contained in:
Janos Follath 2016-10-25 10:50:22 +01:00 committed by Simon Butcher
parent 0eced5aae5
commit 182013faf4
2 changed files with 5 additions and 2 deletions
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4
ChangeLog
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@ -2,6 +2,10 @@ mbed TLS ChangeLog (Sorted per branch, date)
= mbed TLS 2.x.x branch released xxxx-xx-xx
Security
* Removed MD5 from the allowed hash algorithms for CertificateRequest and
CertificateVerify messages, to prevent SLOTH attacks against TLS 1.2.
Bugfix
* Fix the redefinition of macro ssl_set_bio to an undefined symbol
mbedtls_ssl_set_bio_timeout in compat-1.3.h, by removing it.

3
library/ssl_tls.c
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@ -7653,8 +7653,7 @@ int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_SSL_HASH_MD5:
ssl->handshake->calc_verify = ssl_calc_verify_tls;
break;
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_SSL_HASH_SHA1: