CESG Assured Service (Telecoms) - CAS (T)

CESGNNT Change Tracker’s continuous File Integrity Monitoring, non-stop vulnerability management and compliance controls make it an ideal solution to address CAS (T) requirements for continuous monitoring.

These Security Procedures are designed to enable a Communications Provider (CP) to use the CESG Assured Service (Telecoms) to provide assurance to customers that its telecommunications systems and services conform to industry good practice aligned to HMG standards and requirements.

CESG

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Although these Security Procedures are a superset of ISO 27001, they define the mandatory security controls and other requirements that CPs must meet in order to achieve certification under the CESG Assured Service (Telecoms) (CAS(T)).

Scoping the Information Security Management System (ISMS) correctly is a key element of meeting this standard security level. It requires consideration of critical applications and equipment, network elements, ‘system users, administrators and managers’, utilities and the physical location.

The scope of the risk assessment must include all of the entities identified in the scope section below. It must also consider external interfaces such as customer portals, remote access, third party support, corporate networks, etc.

Risks to be considered must include:

  • Physical attacks.
  • Denial-of-service attacks against network elements.
  • Attacks on management layers via network elements.
  • Attacks via management layers (unauthorised individuals).
  • System failures.
  • Deliberate misconfiguration by authorised individuals.
  • Accidental misconfiguration.
  • Threats to the confidentiality and integrity of customer data.
  • Equipment failures.

In addition, requirement A.14 specifically references that Security requirements for critical equipment and critical applications should be specified, to include authentication, logging, configuration and provision of security patches by the vendor. Formal security standards should be considered for assuring products where possible, for example, by specifying standards such as the Center for Internet Security (CIS) Benchmarks.

NNT’s real-time, continuous approach to compliance, configuration-drift reporting and breach detection provides a cohesive means of demonstrating compliance with CAS(T) requirements.

CIS
"Did you know....NNT are a CIS Certified Software Vendor"

The Center for Internet Security is the primary recognized industry-standard for secure configuration guidance, developing comprehensive, consensus-derived checklists to help identify and mitigate known security vulnerabilities across a wide range of platforms.

Additional CESG resources
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