Class 6200.docx - 1 Read the following three recent bug...

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1. Read the following three recent bug reports from the Bugtraq mailing list ( ). For each of them, decide whether an attack exploiting it violates confidentiality, integrity, availability, or some combination thereof. Give reasons for your decision. 1) wxGTK: User-assisted execution of arbitrary code. 2) Cisco Security Advisory: Cisco IOS XR Software Border Gateway Protocol Vulnerability. 3) File Content Disclosure in TCMS. 2. Consider a computer system with three users: Alice, Bob, and Cyndy. Alice owns the file alicefs, and Bob and Cyndy can read it. Cyndy can read and write the file bobfs, which Bob owns, but Alice can read and execute it. Only Cyndy can read and write the file cyndyfs, which she owns. Assume that the owner of each of these files can execute it. a) Create the corresponding access control matrix. b) Cyndy gives Alice permission to read cyndyfs, and Alice removes Bob’s ability to read alicefs. Show the new access control matrix. 3. Consider the set of rights {read, write, execute, append, modify, own, truncate}. a. Using the syntax in Section 2.3 of the text book (Introduction to Computer Security), write a alicefs bobfs cyndyfs Alice O, X R, X R Bob O, X Cyndy R R, W O, X, R, W
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command delete_all_rights (p, q, s). This command causes p to delete all rights the subject q
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  • Spring '14
  • Gail-JoonAhn

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