Exploiting the ret2popret approach with pwntools to gain a shell: A step-by-step guide

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Exploiting the ret2popret approach with pwntools to gain a shell: A step-by-step guide

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Assignment Instructions:

1.) For this question, ASLR should be off on your VM and in GDB. Write a proof of concept exploit script using pwntools & python3 that successfully gets a shell using the “ret2popret” approach. Upload your proof of concept script. The proof-of-concept script should run simply by executing your script in the same directory with the binary hw2p1 – pwntools should start the binary as part of the script. Required: “binPath=./hw2p1”. Do not set an absolute binpath (e.g. /home/kail/HW2/…). Discussion: The ret2popret approach takes advantage of having a pointer to your buffer passed as an argument to your function. That is what is happening here… but just one “pop ret” gadget isn’t going to do it. You’ll need to string together a series of gadgets that “ret” to your payload. Additionally, there are bad characters that you’ll need to look out for. This means you’ll need to encode your payload appropriately. The payload should spawn an interactive shell on the local box (do not provide a bind shell or reverse shell payload).
2.) For this question, ASLR should be ON on your VM. Write a proof of concept exploit script using pwntools & python3 that successfully gets a shell by exploiting a format string vulnerability in the program. In particular:
Leak the addresses of the GOT & the winner function;
Use these to overwrite an address in the GOT with the address of the “winner” function (which will spawn you a shell). The proof-of-concept script should run simply by executing your script in the same directory with the binary hw2p2 – pwntools should start the binary as part of the script. Required: “binPath=./hw2p2”. Do not set an absolute binpath (e.g. /home/kail/HW2/…). You are permitted to use the “pwn.fmtstr_payload” function from pwntools. You are not permitted to use the “pwn.FmtStr” function that automates the exploitation of format string vulnerabilities.

How To Work On This Assignment(Example Essay/Draft)

Knowing how to exploit software flaws is crucial in the field of computer security. The “ret2popret” approach and format string vulnerabilities are two popular techniques. This essay will go through how to use Python 3 and pwntools to exploit these flaws.

In order to answer the first query, we must create a proof-of-concept exploit script that uses the “ret2popret” method to obtain a shell. This method benefits from your function receiving a pointer to your buffer as an argument. One “pop ret” device is insufficient, though. We must connect a number of devices that “ret” to our payload. There are other undesirable characters that require proper encoding. On the local system, the payload ought to launch an interactive shell.

In order to do this, we first disable ASLR on our VM and in GDB. Then, we use Python 3 and pwntools to create our script. By running the proof-of-concept script in the same directory as the binary hw2p1, we upload it and make sure it functions. We must remember that we cannot set an absolute binpath.

For the second question, ASLR must be enabled on our virtual machine, and we must create a proof-of-concept exploit script that takes advantage of a program’s format string vulnerability to obtain a shell. We must first divulge the addresses for the winner function and GOT. In order to launch a shell, we use these addresses to replace a GOT address with the address of the “winner” function.

To accomplish this, we create our script with Python 3 and pwntools. For this exploit, we can utilize the “pwn.fmtstr_payload” function from pwntools. It’s crucial to remember that we cannot employ an absolute binpath.

In conclusion, exploitation of software flaws is an essential component of computer security. We can increase our knowledge of software security and increase the security of our systems by learning how to use the “ret2popret” technique and format string vulnerabilities. We can quickly create proof-of-concept exploit scripts using pwntools and Python3 to help us practice and understand these techniques.

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