openssl mitm downgrade attack

The SSL/TLS server implementation in OpenSSL 0.9.7 before 0.9.7h and 0.9.8 before 0.9.8a, when using the SSLOPMSIESSLV2RSAPADDING option, disables a verification step that is required for preventing protocol version rollback attacks, which allows remote attackers to force a client and server to u...

CVE-2001-1444: Undefined Security Weakness

The Kerberos Telnet protocol, as implemented by KTH Kerberos IV and Kerberos V Heimdal, does not encrypt authentication and encryption options sent from the server, which allows remote attackers to downgrade authentication and encryption mechanisms via a man-in-the-middle attack...