NIST defines "Cloud Computing" as "a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. This cloud model promotes availability... "
This concept comes with a great concern about the way to provide security over this new business model, which usually focuses on the server component of the solution, forgetting about the vulnerabilities associated to the end-point of access.
Companies which are moving to the cloud are exposing, not only their information, but the information of thousands of companies stored on the shared infrastructure, to ID Theft and data leak caused by vulnerabilities such as Loggers, Spyware, Sniffers, Pharming, Man-in-the-Middle and Phishing.
This way, if companies doesn't take the problems associated to the end-point access seriously, the whole project can fail.