American Telephone and Telegraph System V/MLS Release 1.1.2 Running on Unix System V Release 3.1.1
Final evaluation rept.
NATIONAL COMPUTER SECURITY CENTER FORT GEORGE G MEADE MD
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The security protection provided by the ATT System VMLSSystem V MLS operating system, configured as described in the Trusted Facility Manual, when running on the ATT 3B2500 or 3B2600 mini computers, has been evaluated by the National Computer Security Center NCSC. The security features of System VMLS were examined against the requirements specified by the DoD Trusted Computer System Evaluation Criteria the Criteria or TCSEC dated 26 December 1985 in order to establish a TCSEC rating. The NCSC evaluation team has determined that the highest class at which System VMLS satisfies all the specified requirements of the Criteria is class B1. Therefore System VMLS, when configured in the manner described in the Trusted Facility Manual, has been assigned a class B1 rating. A system that has been rated as being a B1 class system provides a Trusted Computing Base TCB that preserves the integrity of sensitivity labels and uses them to enforce a set of mandatory access control rules. The UNIX System V operating system is a general purpose time-sharing system. System VMLS, an enhanced version of UNIX System V, was developed to meet the B1 Criteria while maintaining compatibility with UNIX System V.
- Computer Systems Management and Standards