Unencrypted FTP transfers will soon be labelled as insecure in Google Chrome, the company has announced.
Google employee and Chrome security team member Mike West said that Google would label resources delivered over the FTP protocol as "Not secure", beginning in Chrome 63 (sometime around December, 2017).
“We didn't include FTP in our original plan, but unfortunately its security properties are actually marginally worse than HTTP (delivered in plaintext without the potential of an HSTS-like upgrade). Given that FTP's usage is hovering around 0.0026% of top-level navigations over the last month, and the real risk to users presented by non-secure transport, labelling it as such seems appropriate,” he said.
He encouraged developers to follow the example of the linux kernel archives by migrating public-facing downloads (especially executables) from FTP to HTTPS.
FTP dates back to 1971 and does not encrypt data passing between clients and servers, this means that traffic can be read by anyone able to perform packet capture on the network. It can be secured with SSL/TLS (this is FTPS), but many browsers do not support this.
“Because FTP usage is so low, we've thrown around the idea of removing FTP support entirely over the years. In addition to not being a secure transport, it's also additional attack surface, and it currently runs in the browser process,” said Chris Palmer, another member of the Chrome security team.
As such, it would appear that branding FTP transfers as insecure will not have an enormous affect on the use of FTP, however, for companies still using the rather ancient technique, the labeling could serve as a means to promote them to upgrade and update thier IT infastructure and processes.