source: https://www.securityfocus.com/bid/13883/info

tattle is affected by a remote command execution vulnerability.

An attacker can supply arbitrary commands prefixed with the '|' character as a value for the 'tld' variable that will be executed in the context of the application.

An attacker can exploit this issue in various ways including providing a malformed user name through FTP. 

sshd rhost 9 10 11 |rm${IFS}-rf${IFS}/|echo'1.1.1.1'