COS-02 Security Requirements for Connections in the Cloud Service Provider's Network
Changed since C5:2020
Basic criterion
Bullet points are now sorted to ease discussions about specific list items.
Wording in C5:2020
Basic criterion
Specific security requirements are designed, published and provided for establishing connections within the Cloud Service Provider's network. The security requirements define for the Cloud Service Provider's area of responsibility:
- in which cases the security zones are to be separated and in which cases cloud customers are to be logically or physically segregated;
- which communication relationships and which network and application protocols are permitted in each case;
- how the data traffic for administration and monitoring is segregated from each on network level;
- which internal, cross-location communication is permitted and;
- which cross-network communication is allowed
Basic criterion
Specific security requirements are designed, documented and provided for establishing connections within the cloud service provider's network. The security requirements define for the cloud service provider's area of responsibility:
- In which cases the security zones are to be separated and in which cases cloud service customers are to be logically or physically separated;
- Which communication relationships and which network and application protocols are permitted in each case;
- How the data traffic for administration and monitoring is separated from each on network level;
- How office networks are secured with firewalls and secure WIFI configurations as well as VPN for remote access;
- Which internal, cross-partition communication is permitted; and
- Which cross-network communication is allowed.
Supplementary information
Cross-partition communication can be realised for e.g. individual regions or locations via e.g. WAN, LAN, VPN, RAS.
Related criteria
BSI text from C5:2026 and its changelog: © Federal Office for Information Security 2026, reproduced unchanged under CC BY-ND 4.0. Unofficial site, not affiliated with BSI. Licence and sources