Two vulnerabilities have been reported in OpenSSL, which can be exploited by malicious people to conduct spoofing attacks or cause a DoS (Denial of Service).
1) Certain OpenSSL functions fail to correctly verify the return value of the "EVP_VerifyFinal()" function when validating the signature of DSA and ECDSA keys. This can be exploited to bypass the signature check by e.g. sending a specially crafted signature of a certificate chain to a client.
Successful exploitation requires that the server uses a certificate containing a DSA or ECDSA key.
The vulnerability is reported in versions prior to 0.9.8j.
2) An error in the DTLS implementation can be exploited to crash a DTLS server via a "ChangeCipherSpec" record sent before "ClientHello".
The vulnerability is reported in versions prior to 0.9.8i.
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Subject: OpenSSL Spoofing and Denial of Service Vulnerabilities
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