If we use a regular JOIN it is possible that reordering could result in the original error being encountered (because the chrome_extensions table generates with no uid in its context). Note: It is important to use CROSS JOIN as this tells the query optimizer not to reorder the evaluation of the tables. Writing the query with this JOIN ensures that osquery first generates the list of users, and then provides the user uids to the chrome_extensions table when generating that data. This is clearly a useful technique for pivoting from the. This in turn allows the attacker to obtain valid temporary credentials to access the AWS APIs with the instance-assigned privileges in a convenient and scalable fashion. Typically this is achieved by a JOIN against the users table to retrieve data for every user on the system: SELECT uid, nameįROM users CROSS JOIN chrome_extensions USING (uid) So, any attacker that obtains query access to an osquery fleet can query the AWS metadata service using the curl table. Show osquery which users to retrieve the data for. A query running as root does not know which directories to check. When run as a normal user, the implementations know to look in paths relative to the user’s home directories. This same issue manifests on many tables that include a uid column:Īs stated in the error message, these tables return “data based on the current user by default”. Our query runs as expected when osqueryi is run as a normal user, but returns a warning message and no results when run as root via sudo osqueryi. Using basic SQL commands, you can ask questions about devices, such as servers, Docker containers, and computers running Linux, macOS, or Windows. W0519 09:35:27.624747 415233472 virtual_table.cpp:959] The chrome_extensions table returns data based on the current user by default, consider JOINing against the users table Osquery is an open source tool that lets you query operating systems like a database, providing you with visibility into your infrastructure and operating systems. | 501 | 1Password extension (desktop app required) | Osquery> SELECT uid, name FROM chrome_extensions LIMIT 3 Because of this, the easiest way to find vulnerabilities in osquery is by finding vulnerabilities in osquerys SQL tables. Many an osquery user has encountered a situation like the following: $ osqueryi Net Core AutoIT Azure Backup Compiler Computer Inventory Connection issue Crystal Reports Disk Space Event ID Excel Exchange FileZilla Filter Formatting FreshDesk GUI Hyper-V IIS JQuery JSON Linux MS Azure MS Office MS Reporting Services MS SQL O365 Office365 OLAP OneDrive4Business Oracle Outlook Parameter PoSH-SSH PowerBI Power BI Powerhell PowerPivot Powershell PowerShell Core QlikView RADIUS Report Builder REST RPI SDF Search Security SharePoint Sharepoint Lists SOAP SQL Sqlite SSAS SSRS Updates VBScript VPN WebMatrix Web Services Windows Windows 10 Windows IoT Windows Server Windows Server 2016 Windows Server 2019 Windows Server Backup Windows Update WMI WordPress Workflow XML/AĮnter your email address to follow this blog and receive notifications of new posts by email.Osquery: Consider joining against the users table Proper use of JOIN to return osquery data for users Then install the osquery agent and it should check into the manager and start showing up. Use so-allow to allow the osquery agent to connect to port 8090 on the manager. Windows Server – PowerShell Sub process don’t stop, consumes a lot of Memory ! To deploy an osquery agent to an endpoint, go to the Security Onion Console (SOC) Downloads page and download the proper osquery agent for the operating system of that endpoint.Power BI – Dataflow Error : configurationproperties.Windows Server 2019 – Group Policy sections missing in Group Policy Editor.MS Edge – ActiveX in MS Edge & Chrome Browser.MS Exchange Online – Hybrid Exhange Config – AD msExch Properties not correct.
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