Host & Network Penetration Testing: The Metasploit Framework CTF

Hi everyone, I've been working on the "Host & Network Penetration Testing: The Metasploit Framework CTF 1." I managed to gain access to the target using the "mssql_payload" module and established a Meterpreter session. I've already retrieved Flag 1, but I don't have sufficient privileges to obtain Flags 2, 3, and 4. Could anyone assist me with privilege escalation?