November 24, 2020

You’ve heard of password stuffing, now get ready for endpoint stuffing (Strangest “attack” on my companies servers I’ve seen)

A single clientIp hit one of our endpoints with a brute force dictionary attack. To what end, I have no idea.
Among the 2500 requests they sent over a 20 second period, they sent some very weird ones

item/v5/traceroute
item/v5/sftp
item/v5/hack
item/v5/virus
item/v5/anal

As well as some that make it look like they’re just trying to discover real endpoints to call, such as

item/v5/image
item/v5/logos
item/v5/careers
item/v5/faq
item/v5/delete

Here’s the full list (none of these are valid requests)
https://hastebin.com/ilaseveboz.log

And all of our actual endpoints under item/v5 are all supposed to be consumer facing, so they’re not going to discover anything they’re not supposed to be able to access anyway.

Only practical purpose I can guess is they are testing if they’ll get rate limited.

Comments

tweedge

>… they’re not going to discover anything they’re not supposed to be able to access anyway.

That’s what they’re testing for – trying to find any undocumented API routes to probe further at.

Edit: Looks like a pretty standard/unspecialized dictionary, most likely pulled from a directory buster (examples: they checked for `item/v5/wp-admin`, `item/v5/wp-content`, etc.). Weaksauce recon, I rate it 2/10.

lawtechie

This looks like [Dirbuster](https://sourceforge.net/projects/dirbuster/) output.

irishayes86

Check out Imperva if you haven’t already. 10/10 highly recommended as a web application firewall!

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