Some vulnerabilities have been reported in OpenSSL, which can be exploited by malicious people to disclose sensitive information or cause a DoS (Denial of Service).
1) A double-free error in the handling of server name extension data if "server_name" set to 0x00 can be exploited to crash a server application using OpenSSL by sending a specially crafted TLS 1.0 Client Hello packet.
Successful exploitation requires that OpenSSL is compiled using the TLS server name extensions.
2) A NULL pointer dereference error can be exploited by a malicious server to crash a client application when the "Server Key exchange message" is omitted from a TLS handshake and anonymous Diffie-Hellman key exchange is used.
3) An error when performing certain computational operations for NIST elliptic curves P-256 or P-384 can be exploited to e.g. recover the private key of a TLS server.
Successful exploitation of this vulnerability requires that a 32bit version and that ECDHE family ciphers (without the SSL_OP_SINGLE_ECDH_USE ECDH option) or ECDH family ciphers are used.
Solution: Update to version 0.9.8h.
Provided and/or discovered by: 1, 2) Ossi Herrala and Jukka Taimisto, Codenomicon Ltd.
3) B. B. Brumley, M. Barbosa, D. Page, and F. Vercauteren
Original Advisory: OpenSSL:
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Subject: OpenSSL Multiple Vulnerabilities
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