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Uname:Linux wp 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64

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System : Linux wp 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64
User : www-data ( 33)
PHP Version : 7.2.24-0ubuntu0.18.04.17
Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,
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Directory : /www/server/php/72/src/ext/gmp/tests/

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Current File : /www/server/php/72/src/ext/gmp/tests/bug70284.phpt

--TEST--
Bug #70284 (Use after free vulnerability in unserialize() with GMP)
--SKIPIF--
<?php if (!extension_loaded("gmp")) print "skip"; ?>
--FILE--
<?php

$inner = 'r:2;a:1:{i:0;a:1:{i:0;r:4;}}';
$exploit = 'a:2:{i:0;s:1:"1";i:1;C:3:"GMP":'.strlen($inner).':{'.$inner.'}}';

$data = unserialize($exploit);

$fakezval = ptr2str(1122334455);
$fakezval .= ptr2str(0);
$fakezval .= "\x00\x00\x00\x00";
$fakezval .= "\x01";
$fakezval .= "\x00";
$fakezval .= "\x00\x00";

for ($i = 0; $i < 5; $i++) {
	$v[$i] = $fakezval.$i;
}

var_dump($data);

function ptr2str($ptr)
{
$out = '';
	for ($i = 0; $i < 8; $i++) {
		$out .= chr($ptr & 0xff);
		$ptr >>= 8;
	}
	return $out;
}
?>
--EXPECTF--
array(2) {
  [0]=>
  string(1) "1"
  [1]=>
  object(GMP)#%d (2) {
    [0]=>
    array(1) {
      [0]=>
      string(1) "1"
    }
    ["num"]=>
    string(1) "1"
  }
}

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