[cabfpub] OpenSSL MITM

Stephen Davidson S.Davidson at quovadisglobal.com
Thu Jun 5 12:21:59 UTC 2014

SSL/TLS MITM vulnerability (CVE-2014-0224)





An attacker using a carefully crafted handshake can force the use of weak

keying material in OpenSSL SSL/TLS clients and servers. This can be

by a Man-in-the-middle (MITM) attack where the attacker can decrypt and 

modify traffic from the attacked client and server.


The attack can only be performed between a vulnerable client *and*

server. OpenSSL clients are vulnerable in all versions of OpenSSL. Servers

are only known to be vulnerable in OpenSSL 1.0.1 and 1.0.2-beta1. Users

of OpenSSL servers earlier than 1.0.1 are advised to upgrade as a


OpenSSL 0.9.8 SSL/TLS users (client and/or server) should upgrade to

OpenSSL 1.0.0 SSL/TLS users (client and/or server) should upgrade to 1.0.0m.

OpenSSL 1.0.1 SSL/TLS users (client and/or server) should upgrade to 1.0.1h.


Best, Stephen

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