There are five actions taken to improve the security of a vulnerable server, enumerated as follows. 1 Fix Root Password The original password for root is “default”, which is unsecure. Attackers could easily crack the password with the brute-force mode. I gained the password in several minutes with the tool Metasploit. To fix the problem, the password was reset to a stronger one “Afcb136!” with 8-character length and four types of characters. Then, I retried the brute-force attacks and it failed to get the password as the result. The new password with higher complexity improves the system security compared to the old one. There are three actions in the terminal: sudo passwd, type and confirm the new password “Afcb136!”. Consequently, the terminal …show more content…
Firstly, a password will be expired in 90 days. I changed the line PASS_MAX_DAYS from 99999 to 90 in the /ect/login.defs file, which set the expiration from never to 90 days. The following changes took place in the /ect/pam.d/common password file. Secondly, users are only allowed to input password for three times. The account will be blocked once the password fails in three times. Thirdly, the length of the password is required to be larger than or equal to 8 characters. Additionally, passwords need to involve at least one digit, one uppercase letter and one lower case letter. Finally the password is rejected if the password is the username in the straight or reverse form. To implement the above password policies, I installed the power module libpam-cracklib by the command “apt-get update” and “apt-get install libpam-cracklib”. Then I separately added the parameter “retry=3” (for the times of retrying password), “minlen=8” (for the length of password), “dcredit=-1” (at least one digits), “ucredit=-1” (at least one upper case letter), “lcredit=-1” (at least one lower case letter) and “reject_username” (for rejection of setting the username as password) in the command password file. To evaluate the password policy, I reset the password according to the password policies and tried to have the access to the password in another machine the tool …show more content…
The biggest problem of the telnet service is that all the text which users try to send across the network is unchanged. Especially, the username and password are sent in plain text. As a result, the attackers could easily capture the data and gain the password if they are in the same network with telnet connection. Compared to telnet, SSH is more secure due to the encrypted connection. Therefore, I blocked the port 23 (telnet service). To close the unsecure port 23, I set up a firewall with some rules. Firstly, I created a new file called “firewall.sh” by the command “touch firewall.sh”. Then, I added the rule “iptables -A INPUT -i eth0 -p tcp --dport 23 -j ACCEPT”. Finally, I ran the file to block the telnet service. Although other ports are more secure, they will be closed in the same way if they are not in use. 5 Set SSH Public Key
1. Check the back table for any measurement sheets that have been filled out. 2. Make sure the sheet is filled out correctly and has been initialed by the individual who measured the client. If it’s not filled out correctly do not record it!
o Would it be useful to identify the core issue of the risk being addressed? In the month of July, 4 teams noted inability to safely evacuate from the home. Although this is risk, it is unclear why. If teams were to implement the 5 why’s, could they drill down to the core issue. For example, if the inability to evacuate was due to mobility, could we identify DME to mitigate that risk.
As you type your passwords it hides each character. After entering your information
Changing finger information . Password: Name [user wks]: Office []: Programming Lab 2 Office Phone []: 2301 Home Phone []: 5947280 Finger information changed. c. View information finger $ Finger $ Finger 5: Using the manual
now if we use hash and because of its onewayness it is impossible to get back the password. If we use pure hash in the password and encrypt it, it can be broken easily by exhaustive search so that is why we have add some randomness to the password before the hash function is applied. The randomness is stored with the password hash. So now instead of pure hash and pure password we store the hash o/p of password chosen by me and some random number chosen by the system. From now whenever we use the password the system associates with the random number and gives access.
I have been asked to use Ubuntu? One comparison between windows and linux is that Linux is a lot freer than windows because windows are restricted. Another comparison is windows are a lot safer because if something breaks you get paid support whereas on Linux you do not have any support. My experience with Linux is not much as I am entirely a windows user.
You could login using the command-line or a GUI interface depending on the system configuration. Example of a GUI login interface on a CentOS machine User enters "username" on this screen and hits enter. User enters the password on this scree and hits "Sign In" Example of a command line login interface (Unix System with no GUI interface) login as: mususer1 password: Note
At the time of your first login, the “Change Password” screen will appear. 4. Enter your old password, then enter your new password twice, then select the “change password” button. 5. Once you’ve changed your password, select the “Remember me” checkbox to save your login credentials.
User authentication in Ubuntu 15.04 systems in an AD environment All HACKD, LLC systems are supposed to be connected to the Microsoft Active Directory domain. However, after implementing Ubuntu 15.04 in the systems that were running on Windows XP, there is a need to ensure interoperability by allowing Ubuntu users to join the AD domain using their credentials. In such instances, the Samba software suite is used to provide AD connectivity and provide stable, secure and fast file sharing and print services to all clients using the SMB/CIFS protocol. In this case, Samba is a critical component for integrating Linux clients in a Windows environment (Samba.org, 2015).
After compiling all of the ingredients into a numbered list, I find out that every product “purchased” at Harris Teeter would account for $116.19 over the budget. The few adjustments I made to my shopping list beforehand did not help reduce the total to a reasonable price either. While I was going through all of the products at home, I crossed out a few unnecessary items that were optional or switched to products with a lower price just to see if I could be within the budget. Eventually, after I was done “shopping” and tallying up all of the prices, the cost still exceeded the price that I calculated in my head. As I went down the aisles searching for foods on my grocery list, I kept a close eye out for products that had nutritious labels such as organic, fresh, or low in sodium so that the college student I chose could receive the right amount of nutrients needed for a healthy lifestyle.
IGN(InGame Name)- Dxnyy Date of Application- 24/6/15 Age(Age doesn't really matter, we're looking for mature staff that won't mess around, if you don't fit this then you will not be accepted)- 12 Country- England, UK.
Assignment-7 Group Policies Group Policies: Group policies specifies settings for users and computers which includes security settings, software installation, computer startup and shut down, registry based policy settings and folder redirection. Group policies are responsible for controlling the working environment of users and computers accounts. It provides the configuration and management of the user’s settings, operating system and applications in a working environment. It is responsible for the user’s actions in a computer like what a user can and cannot do on the computer for example enforce users to have a complex password to prevent the network from being accessed by unidentified users. Group policies when properly planned and implemented
Password policies are in place for a variety of reasons. These policies are to establish a standard for strong password creation, the protection of the passwords, and the frequency at which it is changed. The Virtual Private Network (VPN) extends a private network across a public network like the internet. It enables users to send and receive data across shared or public networks. This is done as if they were directly connected to the private network.
In this leaflets I will be talking about how the network can be attacked, One way the network can be attacked is DOS and what this stands for is Denial of service, this attacks the network by overflowing the network with useless traffic, the result of this overflowing cause the network to slow down significantly, and even can crash the network if it overflows too much. The damage that is can do to a business is huge they can lose a lot of money to fix the issue. The weird thing is that the hacker does not even benefit from this attack. The second way the network can be attacked is backdoor this attack is basically when you can access a computer program that side-steps security, the hackers use backdoors that they made or backdoors they found,
Locks: There is a need for locks on both the building and Central wiring closet. These locks will limit access to the physical network. They will also provide a barrier to stop someone from walking up and just plugging in something into the network. Everyone always focuses on the logical setup of the network and forgets that physical access is just as important. The same locks should be used for the alternate site where the backups are.