Argument injection vulnerability in (1) src/content/js/connection/sftp.js and (2) src/content/js/connection/controlSocket.js.in in FireFTP Extension 1.0.5 for Firefox allows remote authenticated SFTP users to cause victims to alter permissions, delete, download, or move the wrong file via a filename containing " (double quotes), which is not properly filtered or encoded when FireFTP constructs the command to send to psftp.exe.