Security requirements for the process being outsourced are the specifications and standards that the third party must comply with to ensure the confidentiality, integrity and availability of the critical business information. They define the roles and responsi-bilities of both parties, the security controls and measures to be implemented, the se-curity objectives and expectations, the security risks and mitigation strategies, and the security monitoring and reporting mechanisms. Security requirements are essential to protect the information assets of the organization and to establish a clear and en-forceable contractual relationship with the third party.
Reference:
* 1 Outsourcing Strategies for Information Security: Correlated Losses and Security Exter-nalities - SpringerLink
* 2 What requirements must outsourcing services comply with for the European market? - CBI
* 3 Outsourcing cybersecurity: What services to outsource, what to keep in house - Infosec Institute
* 4 BCFSA outsourcing and information security guidelines - BLG

The greatest concern for an information security manager in this situation would be the security of the data that is being processed by the third-party service provider working from a remote site. This could be a concern because the data may not be adequately protected from unauthorized access, manipulation, or theft. A secure communications protocol should be used to ensure the confidentiality and integrity of the data in transit. Additionally, the information security manager should ensure that the third-party service provider has appropriate security controls in place to protect the data, such as access controls, error checking, and malware protection. This information can be found in the ISACA's Certified Information Security Manager (CISM) Study Manual, Section 5.2.