For IaaS providers we aim to enable secure automation and allocation of processing resources, uptime and availability by toughening under-the-hood Data Loss Prevention mechanisms.
Platform as a Service must provide a reliable base of operations on the cloud that seeks to offer highly extensive uses and greater control. These capabilities pose the risk of unintended data leakage.
Cloud analytics applications present an easier opportunity to mount attacks that compromise service availability - reason why extortionist DDoSers find more success with them.
The security of SaaS APIs and applications are also impacted by the Infrastructure and Platform layers.