The ssl3_get_cert_verify function in s3_srvr.c in OpenSSL 1.0.0 before
1.0.0p and 1.0.1 before 1.0.1k accepts client authentication with a
Diffie-Hellman (DH) certificate without requiring a CertificateVerify
message, which allows remote attackers to obtain access without
knowledge of a private key via crafted TLS Handshake Protocol traffic
to a server that recognizes a Certification Authority with DH support.
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