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Fix SRP ciphersuite DoS vulnerability.

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If a client attempted to use an SRP ciphersuite and it had not been
set up correctly it would crash with a null pointer read. A malicious
server could exploit this in a DoS attack.

Thanks to Joonas Kuorilehto and Riku Hietamäki from Codenomicon
for reporting this issue.

CVE-2014-5139
Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Dr. Stephen Henson
2014-07-29 21:23:30 +01:00
committed by Matt Caswell
parent 86788e1ee6
commit 83764a989d
2 changed files with 14 additions and 0 deletions
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5
ssl/ssl_lib.c
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@@ -1406,6 +1406,11 @@ int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p,
s->psk_client_callback == NULL)
continue;
#endif /* OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
if (((c->algorithm_mkey & SSL_kSRP) || (c->algorithm_auth & SSL_aSRP)) &&
!(s->srp_ctx.srp_Mask & SSL_kSRP))
continue;
#endif /* OPENSSL_NO_SRP */
j = put_cb ? put_cb(c,p) : ssl_put_cipher_by_char(s,c,p);
p+=j;
}