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Fix DHE Null CKE vulnerability

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If client auth is used then a server can seg fault in the event of a DHE
cipher being used and a zero length ClientKeyExchange message being sent
by the client. This could be exploited in a DoS attack.

CVE-2015-1787

Reviewed-by: Richard Levitte <levitte@openssl.org>
This commit is contained in:
Matt Caswell 2015-03-10 16:38:32 +00:00
parent 76343947ad
commit b19d814321
1 changed files with 9 additions and 2 deletions
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11
ssl/s3_srvr.c
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@ -2251,10 +2251,17 @@ int ssl3_get_client_key_exchange(SSL *s)
if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
int idx = -1;
EVP_PKEY *skey = NULL;
if (n)
if (n > 1) {
n2s(p, i);
else
} else {
if (alg_k & SSL_kDHE) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
goto f_err;
}
i = 0;
}
if (n && n != i + 2) {
if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) {
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,