SSH2 clients for VanDyke (1) SecureCRT 4.0.2 and 3.4.7, (2) SecureFX 2.1.2 and 2.0.4, and (3) Entunnel 1.0.2 and earlier, do not clear logon credentials from memory, including plaintext passwords, which could allow attackers with access to memory to steal the SSH credentials.
http://www.securitytracker.com/id?1006012
http://www.securitytracker.com/id?1006011
http://www.securitytracker.com/id?1006010
http://www.securityfocus.com/bid/6728
http://www.securityfocus.com/bid/6727
http://www.securityfocus.com/bid/6726