Have you recently visited eBay? The site is a popular destination for buying new and used items. You will probably be surprised to learn that eBay scans your computer ports when you visit the site with a browser.
You can verify it very easily. Use a browser such as Google Chrome, Firefox, Brave, Microsoft Edge, or Vivaldi. Open a new page and press the F12 key to open the Browser Developer Tools.
Open an eBay page on the Network tab in Developer Tools.
Wait for the page to load and look for 127.0.0.1 in the list of links. These are the scans that eBay runs when you log in to the site.
You can click the link to see additional ones information. Με αυτόν τον τρόπο θα δείτε την θύρα που σαρώνει το eBay αυτή τη στιγμή. Η σάρωση εκτελείται από το check.js, ένα JavaScript that runs on eBay when users log in to the site. It uses WebSockets to run searches on your local system using a specified port, and scans are performed regardless of connection status.
Bleeping Computer has created a handy table listing the ports:
| Program | Ebay Name | Port (The Harbour District) |
|---|---|---|
| Unknown | REF | 63333 |
| VNC | VNC | 5900 |
| VNC | VNC | 5901 |
| VNC | VNC | 5902 |
| VNC | VNC | 5903 |
| Remote Desktop Protocol | RDP | 3389 |
| Aeroadmin | ARO | 5950 |
| Ammyy Admin | AMY | 5931 |
| TeamViewer | TV0 | 5939 |
| TeamViewer | TV1 | 6039 |
| TeamViewer | TV2 | 5944 |
| TeamViewer | TV2 | 6040 |
| Anyplace control | Services | 5279 |
| AnyDesk | ANY | 7070 |
Most of these ports are used by remote connection applications, such as VNC, Teamviewer, or Windows Remote Desktop.
The Nullsweep website, which mentioned first this issue, found that the scan does not run on Linux systems.
It is not currently known why eBay scans its visitors' computers. Of course the reactions to Twitter and on other social media sites they are very negative. Users generally criticize eBay for scanning ports and for scanning ports as well as users who are not logged into the site.
What can you do;
Block check.js script with a content blocker.
In some browsers, such as Firefox, turn off Web Sockets. EBay is loading script check.js from the following address (currently): https://src.ebay-us.com/fp/check.js
So a regex like || src.ebay-us.com ^ * / check.js should work fine.
The address may change and may differ if you log in from different company addresses such as eBay.de.
The other option, to disable WebSockets completely, but incompatibilities may occur as well problems loading on other sites.
