Pine 4.x allows a remote attacker to execute arbitrary commands via an index.html file which executes lynx and obtains a uudecoded file from a malicious web server, which is then executed by Pine.
http://www.securityfocus.com/bid/1247
http://www.novell.com/linux/security/advisories/suse_security_announce_6.html
http://www.novell.com/linux/security/advisories/pine_update_announcement.html