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Reject invalid PSS parameters.

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Fix a bug where invalid PSS parameters are not rejected resulting in a
NULL pointer exception. This can be triggered during certificate
verification so could be a DoS attack against a client or a server
enabling client authentication.

Thanks to Brian Carpenter for reporting this issues.

CVE-2015-0208

Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Dr. Stephen Henson 2015-03-09 23:16:33 +00:00 committed by Matt Caswell
parent b717b08307
commit 4b22cce381
1 changed files with 2 additions and 1 deletions
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3
crypto/rsa/rsa_ameth.c
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@ -698,9 +698,10 @@ static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE); RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1; return -1;
} }
if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey)) if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
/* Carry on */ /* Carry on */
return 2; return 2;
}
return -1; return -1;
} }