By Dennis Blumenfeld
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Extra resources for Open Source Systems Security Certification
Technical report, November 1977. 10. G. McGraw. Managing software security risks. IEEE Computer, 35(4):99–101, March 2002. 11. G. McGraw. Software security: Building security in. In Proc of the 17th International Symposium on Software Reliability Engineering (ISSRE 2006), November 2006. 12. International Standardization Organization. ISO9126:1991 JTC1/SC7, Information Technology Software Product Quality, 1991. 13. International Standardization Organization. ISO25000:2005 JTC1/SC7, Software Engineering - Software product Quality Requirements and Evaluation (SQuaRE), 2005.
The sensitivity labels assigned to the subjects indicate their level of trust, whereas the sensitivity labels assigned to the objects indicate the security clearance a subject needs to have acquired to access them. Generally speaking, for a subject to be able to access an object, its sensitivity level must be at least equal or higher than the objects’ sensitivity level. One of the most common mandatory policies is Multilevel Security (MLS), which introduces the notion of classification of subjects and objects and uses a classification lattice.
There are some areas for which manual software testing is most appropriate (or, rather, is the only possibility), such as exploratory security testing where testers do not execute a pre-defined script, but rather explore the application and use their experience and intuition to identify vulnerabilities. Manual software testing has two major disadvantages: first of all, it requires a huge effort and remarkable skills on the part of the tester. Secondly, it is not fully repeatable: manual exploratory tests tend to show high variability of results depending on who is performing them.