File hosting services and their data leakage risks, Part II
Over the past few months I have looked at a range of file hosting services. While using these services, I have being monitoring the network traffic as I upload and download files. So far I have found that most of the popular files hosting services use encryption for sending and receiving data. That's both good and bad news for data protection. It's good news from the point of view of not having passwords being sent in clear text, or data being sent using unsecure protocols like FTP. However it introduces challenges when it comes to detecting users accessing these services.
In the first part of this blog article , I focused on the issues file hosting services have for networks which host sensitive data. This second article discusses the methods you can use to detect the presence of them on your network.
If it's encrypted, then I cannot monitor users, right?
While it is true that full analysis cannot be done with encrypted traffic, unless some sort of in-line device is used to capture the encryption keys and re-establish the connections. You can detect and monitor the activity with the right sort of monitoring tools. There are three types of data that you need to focus on
Website usage analysis. Both direct and proxy based. Traffic analysis of all traffic in and out of the Internet gateway. File-share traffic between clients and the local file-share servers.To get this data there are also a number of options; from enabling auditing on servers to installing agents on clients and servers. Personally, I prefer to deploy a traffic analysis tool capable of DPI (deep packet inspection), and monitor the Internet gateway(s), and traffic to/from the main file-share servers. If you don't have something like this available, then you should start to look at your firewall, and work back, making sure you have auditing enabled at each step back to the users, or endpoints on your network. For example on most networks you could follow these steps:
Before you do anything, document what IP address ranges you use on your network. This information is crucial for understanding what is inside and outside of your network perimeter. Check firewall logs for inbound and outbound connections, making sure no 'holes' exist which could be used to transfer data. Being aware of your local subnets makes this task easier. Some applications will 'sniff' out open firewall ports.Proxi Encrypted Large List - News
Alternatively enable logging on your firewall and proxy servers and review these regularly. The network protocols between the clients and the file shares may not be encrypted, so you will get a good idea as to what is going on by monitoring this data.
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