Answer the following questions.

1) A company develops a new security product using the extreme programming software development methodology. Programmers code, then test, the en add more code, then test, and continue this iteration. Every day they test the code base as a whole. The programmers work in pairs when writing code to ensure that at least two people review the code. How would you explain to this company how their software is in fact not high assurance" software?

2) Consider how a system with capabilities as its access control mechanism could deal with Trojan Horses.

A) In general, do capabilities offer more or less protection against Trojan horses than do access control lists? Justify your answer in light of the theoretical equivalence of ACLs and C-Lists
B) Consider now the inheritance of properties of new processes. If the creator controls which capabilities the created process is given initially, how could the creator limit a damage that a Trojan Horse will do?

C) Can capabilities protect against all Trojan Horses? Either show that they can or describe a Trojan horse process that can C-Lists cannot protect against

3) Assume that the Clark -Wilson model is implemented on a computer system. Could a computer virus that scrambled constrained data items be introduced into the system? Why or why not? Specifically, if not identify the precise control that would prevent the virus from being introduced, and explain why it would prevent the virus from being introduced; if yes identify the specific control or controls that would allow the virus to be introduced and explain why they fail to keep it out.

4) Classify the following vulnerabilities using the RISOS model. Assume that the classification is for the implementation level. Justify your answer:

a)The presence of the wiz command in the sendmail program

b) The failure to handle the IFS shell variable by loadmodule

c) The failure to select an Administrator password that was difficult to guess

d)The failure of the Burroughs system to detect offline changes to files

5) A common error in the UNIX system occurs during configuration of bind, a directory name server. The time-to-expire field is set at 0.5 because the administrator believes that this field unit is minutes (and wishes to set the time to 30 seconds) However, bind expects the field to be in seconds and reads the value as 0 - meaning that no data is ever expired.

a) Classify this vulnerability using the RISOS model, and justify your answer

b) Classify this vulnerability using the PA model and justify your answer

c) Classify this vulnerability using the Aslam's model and justify your answer

6) Essay Question:Secure software certification. Your present company is at EAL4. You are the new program manager on this effort and your job is to bring your present software secure package to EAL7. Explain to me your management plan on upgrading your present software package from EAL4 to EAL7. Your management plan should include discussing your past documentation (assignment#2), the difference between EAL4 and EAL7, what additional paperwork will be needed to reach EAL7 certification, and finally, define your risk based on reusing software code for this migration from EAL4 to EAL7 certification.