OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL),Transport Layer Security (TLS), and Datagram Transport Layer Security(DTLS) protocols, as well as a full-strength, general purpose cryptographylibrary.This update adds support for the TLS Fallback Signaling Cipher Suite Value(TLS_FALLBACK_SCSV), which can be used to prevent protocol downgradeattacks against applications which re-connect using a lower SSL/TLSprotocol version when the initial connection indicating the highestsupported protocol version fails.This can prevent a forceful downgrade of the communication to SSL 3.0.The SSL 3.0 protocol was found to be vulnerable to the padding oracleattack when using block cipher suites in cipher block chaining (CBC) mode.This issue is identified as CVE-2014-3566, and also known under the aliasPOODLE. This SSL 3.0 protocol flaw will not be addressed in a futureupdate; it is recommended that users configure their applications torequire at least TLS protocol version 1.0 for secure communication.For additional information about this flaw, see the Knowledgebase articleat https://access.redhat.com/articles/1232123A memory leak flaw was found in the way OpenSSL parsed the DTLS SecureReal-time Transport Protocol (SRTP) extension data. A remote attacker couldsend multiple specially crafted handshake messages to exhaust all availablememory of an SSL/TLS or DTLS server. (CVE-2014-3513)A memory leak flaw was found in the way an OpenSSL handled failed sessionticket integrity checks. A remote attacker could exhaust all availablememory of an SSL/TLS or DTLS server by sending a large number of invalidsession tickets to that server. (CVE-2014-3567)All OpenSSL users are advised to upgrade to these updated packages, whichcontain backported patches to mitigate the CVE-2014-3566 issue and correctthe CVE-2014-3513 and CVE-2014-3567 issues. For the update to take effect,all services linked to the OpenSSL library (such as httpd and otherSSL-enabled services) must be restarted or the system rebooted.