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If you’ve been following the news (oh look, Yahoo was hacked again), then you know that everyone’s a target for hacking. I’ve explained before that even companies in the “we don’t have anything anyone would want to hack” do, in fact, have something someone would want to hack – often information that can stepping-stone the attacker to what they really want.

I also know a lot of you out there rely on “jump servers.” You are asking for a cyber punch in the throat.

For those who don’t know the term, a “jump server” usually exists in environments that like to think of themselves as highly secure. The idea is that admins are completely firewalled off from the datacenter, and instead have to log into a “jump server, ” which is itself in the datacenter, and is the portal by which admins access the rest of the datacenter.

This is how Yahoo got hacked the first time. They too had a jump server, and a clever attacker managed to get a piece of malware onto it, and used to to leak information over a long, long period of time.

So let’s be clear on a few points.

A jump server alone does not make your environment inherently more secure. Just because someone has to go through an extra step to get to servers does not make those servers more secure. Everyone has this idiotic concept that their firewall represents an impenetrable barrier, and that everything inside the firewall is rainbows and unicorns. It isn’t. As an attacker, I appreciate a jump server, because it’s a single point of failure that I need to hack.

A jump server can be useful when it’s a sort of privileged access proxy. That is, I connect to it as a normal user, and it does whatever I ask it to using elevated privileges that only last for the duration of my stay. This is what Microsoft’s JIT/JEA approach attempts to create, although it’s pretty early days on that, and we don’t have tooling to make managing it very easy. But if you’re logging into a jump server as an admin, meaning your privileged credential lives outside the datacenter, then you’re not adding a bit of security to anything.

If you have a jump server, you need to lock that sumbitch down, and hard. You don’t need anti-malware tools on it; you need an aggressive whitelist of what is allowed to run, and a system – like AppLocker on Windows – that will nuke anything not on the whitelist. And, when it does nuke something, will send alert emails to the entire company (which AppLocker won’t). Not kidding – the Yahoo kids knew something was up, but didn’t make loud enough noises. This jump server should be destroyed and rebuilt frequently – like, once a day – using automated tooling. Doing so makes it harder for a hacker to take hold. Access to the jump server must be via two-factor authentication (2FA), period, making it harder for a compromised account to insert code onto the server. Think defense in depth, here – imagine what might happen, put in a means of blocking that, and then imagine what would happen if the block failed, and deal with that also. For example, a jump server’s NICs should be prohibited from entering any kind of promiscuous mode where they could listen to all the traffic on their segment.

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