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You're reading from  Pentesting Active Directory and Windows-based Infrastructure

Product typeBook
Published inNov 2023
PublisherPackt
ISBN-139781804611364
Edition1st Edition
Concepts
Networking
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Author (1)
Denis Isakov
Denis Isakov
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Denis Isakov

Denis Isakov is a passionate security professional with 10+ years of experience ranging from incident response to penetration testing. He worked in various industries, including banking and consultancy. Denis is specialized in offensive security with particular focus on Active Directory and adversary malware. He has earned a Master's degree in Information Systems and Technologies in 2012. Additionally, Denis has achieved an array of industry certifications ranging from OSCP to GXPN. Outside of computers, Denis enjoys sports and discovering new places.
Read more about Denis Isakov

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OS command execution

In the upcoming sections, we will look at ways to execute OS system commands through SQL Server. To enable command execution, sysadmin privileges are required. Execution itself always happens in the context of a service account. An attacker does not need to know the hash or password of the SQL Server service or agent account. Let’s start by looking at built-in extended stored procedures.

xp_cmdshell

xp_cmdshell is probably the most well-known built-in extended stored procedure, which is disabled by default. Enabling it requires sysadmin privileges. There are a few functions in PowerUpSQL (Invoke-SQLOSCmdExec and Invoke-SQLOSCmd), SQLRecon (EnableXp and XpCmd), as well as the Metasploit admin/mssql/mssql_exec module that can automate this task. The manual query to install xp_cmdshell and enable it is shown here:

sp_addextendedproc 'xp_cmdshell','xplog70.dll
EXEC sp_configure 'show advanced options',1
RECONFIGURE
EXEC sp_configure...
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Pentesting Active Directory and Windows-based Infrastructure
Published in: Nov 2023Publisher: PacktISBN-13: 9781804611364
© 2023 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Denis Isakov

Denis Isakov is a passionate security professional with 10+ years of experience ranging from incident response to penetration testing. He worked in various industries, including banking and consultancy. Denis is specialized in offensive security with particular focus on Active Directory and adversary malware. He has earned a Master's degree in Information Systems and Technologies in 2012. Additionally, Denis has achieved an array of industry certifications ranging from OSCP to GXPN. Outside of computers, Denis enjoys sports and discovering new places.
Read more about Denis Isakov

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