data exfiltration over SSL with srvdir

Every now and then I come across some application that may or may not have been developed with penetration testing in mind but it ends up being damn helpful all the same. Yesterday I found a post about ‘srvdir‘ (surv~durr?) which is designed to share content over SSL/TLS via a public site.

When trying to exfiltrate data from a client site I normally spend a lot of time setting up tunnels, using disposable A records from afraid.org and one of my boxes in some east-european cave just so I can get the damn ‘payroll-summary-june-2014.pdf’ trophy off some box that is swimming in ssh-tunnel-fu. srvdir is the perfect answer to this problem and testing it has been awesome and full of those “Why didn’t I think of this?!!” rants.

Essentially, what srvdir does is to create a SSL tunnel to the mothership ‘srvdir.net’ and issue a subdomain that can be accessed externally to siphon the files off. Grabbing files is relatively painless with the odd 404 for the permission snobs. … read more