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Securing the Other Side of the Cloud

Why would miscreants bother with other routes when they can go straight to the source?

Why would miscreants bother with other routes when they can go straight to the source?


People concerned with security of the cloud are generally worried about illegitimate access of the applications and data they may deploy in the cloud. That’s a valid concern given the needs of certain vertical industries to comply with privacy-focused regulations like HIPAA and PCI DSS. It’s an extremely valid concern given research and studies showing just how vulnerable most web sites and applications are. Hint: it’s more than you probably think it is, and it’s likely your application is vulnerable to exploitation.

Moving an application from your environment to the cloud doesn’t make it any less or more vulnerable to exploitation. The same code and platforms that made it vulnerable inside your data center make it vulnerable outside your data center.

But those same platforms and languages and environments are used to build the management systems through which you control your little piece of the cloud and one has to wonder how vulnerable those applications might be. It’s a question that needs to be more well considered given the financial implications of someone with ill intent gaining control over your cloud deployment.


A web-based application is a web-based application no matter what its function may be. That may seem obvious to some folks but all too often it seems that we forget to include them as a potential avenue of entry. If a cloud provider offers up a web-based management console for use to provision and manage resources inside their cloud, then that’s a potential point of exploitation and, methinks, quite a dangerous one.

Those old “u has been hax0red” pages that replaced the index files of web sites and applications might be more easily manipulated through the management console, replacing entire images instead of simply pages. A DoS against a particular site or application might be so easily carried out by compromising the management application and simply shutting down (and perhaps deleting!) instances. No bot-net necessary; just a few clicks on a web page and you are offline.

Go ahead and say it, I know you want to. "But they use SSL to secure the management application!”

Anyone who was thinking that will now go to the blackboard and write 1000 times, “SSL is not application security.” In hex.

SSL is a mechanisms for securing conversation and data in flight. It does not stop vulnerabilities from being exploited, nor does it guarantee that the client attempting to access the application is legitimate – unless the application requires client certificates, and we know that almost never happens. If you still don’t believe me, please see this site and this site for more detail on Google GMail and SSL and vulnerabilities.

SSL is not enough to secure any application and certainly should not be the only security (aside from requiring authentication) that is protecting a cloud management web application. SSL should be only one part of a more comprehensive application security strategy.


Securing any web-based application requires a two-pronged approach: access control and application security. The former ensures that only those legitimately authorized to access the application are allowed to do so, and the latter protects the application and its underlying platforms from myriad attacks – from XSS to session hijacking to parameter tainting to cookie poisoning to SQLi.

Access control can be as simple as IP-based restrictions – allowing access only to a specified IP or range of IP addresses. Or it can be more sophisticated using secure remote access technologies that can not only restrict based on IP (simple) but on type of client or version of client or the existence (or non-existence) of specified applications running on the client machine. Secure remote access uses SSL, so the conversation and data in-flight is protected, but it goes far beyond simple transport-layer security and provides a variety of methods for ensuring that only legitimate users are allowed to access the management application. Doing so reduces the possibility that someone can access the application and begin poking around to find a vulnerability to exploit in the first place.

Application security ensures that the management application is protected against all the standard web-based exploits out there, and further provides the means by which the application can be protected on a moment’s notice through the implementation of scripting-based security solutions. Application security solutions, when coupled with a vulnerability assessment solution, can provide virtual-patching to prevent exploitation of discovered vulnerabilities while developers address – or administrators’ patch – the problem.

There is no reason to not employ every means necessary to protect this most critical application and, given the potential impact on not just one but multiple customers from a single successful attack, there is no reason for customers not to demand that cloud management applications are properly insulated from illegitimate access and potential exploitation.

So if you’re using a cloud solution today, how secure are its management applications? Do you know? Have you asked what solutions are in place to ensure the security of those applications?

Read the original blog entry...

More Stories By Lori MacVittie

Lori MacVittie is responsible for education and evangelism of application services available across F5’s entire product suite. Her role includes authorship of technical materials and participation in a number of community-based forums and industry standards organizations, among other efforts. MacVittie has extensive programming experience as an application architect, as well as network and systems development and administration expertise. Prior to joining F5, MacVittie was an award-winning Senior Technology Editor at Network Computing Magazine, where she conducted product research and evaluation focused on integration with application and network architectures, and authored articles on a variety of topics aimed at IT professionals. Her most recent area of focus included SOA-related products and architectures. She holds a B.S. in Information and Computing Science from the University of Wisconsin at Green Bay, and an M.S. in Computer Science from Nova Southeastern University.

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