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Network services are among the riskiest programs executed by productionsystems. Such services execute large quantities of complex code and processdata from arbitrary and untrusted network sources, often with high levels ofsystem privilege. It is desirable to confine system services to aleast-privileged environment so that the potential damage from a maliciousattacker can be limited, but existing mechanisms for sandboxing servicesrequire invasive and system-specific code changes and are insufficient toconfine broad classes of network services.  Rather than sandboxing one service at a time, we propose that the best placeto add sandboxing to network services is in the service manager that startsthose services. As a first step towards this vision, we propose CapExec, aprocess supervisor that can execute a single service within a sandbox based ona service declaration file in which, required resources whose limited access toare supported by Caper services, are specified. Using the Capsicumcompartmentalization framework and its Casper service framework, CapExecprovides robust application sandboxing without requiring any modifications tothe application itself. We believe that this is a first step towards ubiquitoussandboxing of network services without the costs of virtualization.  Keywords: application security, sandboxing, service manager, Capsicum,compartmentalization

CapExec: Towards Transparently-Sandboxed Services (Extended Version)