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        代寫Computer Security and Networks編程

        時間:2024-02-08  來源:合肥網hfw.cc  作者:hfw.cc 我要糾錯



        Computer Security and Networks: Exercise 1
        Deadline: 1 February 2024, 4pm
        1 Getting the VM working
        You first need to download the VM image and install it, as per canvas page.
        There are many user accounts on the VM; you begin the module with access to just
        one:
        Username: employee427, password: employee427
        You must use your own copy of the VM for this (and every other) exercise.
        You must not share your VM with other students.
        In the home directory you will find a token split into two files theFirstTokenPart1
        and theFirstTokenPart2. The token is the concatention of these two files. Submit this
        token on the website:
        https://www.cs.bham.ac.uk/internal/courses/comp-sec/token
        This token system is not yet operational. A canvas annoucement will be made when
        this system has been set up.
        [1 mark]
        2 Access Control
        For this exercise you need to explore the other home directories on the VM and find out
        more about what is going on at the company, in particular you need to find two tokens, get
        the shadow file and then crack some passwords to find two more tokens. The VM contains
        a number of access control vulnerabilities and you need to find and exploit these to access
        files that are protected.
        1. Look in the directories /home/carolmiller , /home/charlegarcia /home/jakkinkade
        and /home/nikadler, somewhere in there are two files that contain tokens; these files
        are protected by the access control system. Search the home directories for these files
        and find access control flaws that allow you to read the files. Submit the two tokens
        you find to the token submission website.
        1
        [3 marks each]
        2. By exploiting mistakes in the access control settings of the VM, find a way to read
        the /etc/shadow password hash file.
        Once you have the shadow file, install a password cracker and try to crack the passwords for the staff accounts aarushsanders and alayahpritchard. You may use
        any password cracker you like – “John the Ripper” is probably easiest. (N.B. you
        will need the “jumbo” version of john the ripper if you want to crack SHA hashes).
        This program is already installed on the VM. The canvas page for the assignments
        also contains a link to a suitable wordlist.
        The staff accounts aarushsanders and alayahpritchard each contain a token.
        Cracking the passwords to these accounts will allow you to log in as these users
        and read the tokens. Find these tokens and submit them to the token submission
        如有需要,請加QQ:99515681 或WX:codehelp

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