off-by-one overflow in fb_realpath() function in oversized path of few FTP commands.
vulners.com/securityvulns/securityvulns:doc:17054
vulners.com/securityvulns/securityvulns:doc:4931
vulners.com/securityvulns/securityvulns:doc:4937
vulners.com/securityvulns/securityvulns:doc:4948