Splunk: CVE-2024-36983: Command Injection using External Lookups

In Splunk Enterprise versions below 9.2.2, 9.1.5, and 9.0.10 and Splunk Cloud Platform versions below 9.1.2312.109 and 9.1.2308.207, an authenticated user could create an external lookup that calls a legacy internal function. The authenticated user could use this internal function to insert code into the Splunk platform installation directory. From there, the user could execute arbitrary code on the Splunk platform Instance.The vulnerability revolves around the currently-deprecated ”runshellscript” command that scripted alert actions use. This command, along with external command lookups, lets an authenticated user use this vulnerability to inject and execute commands within a privileged context from the Splunk platform instance.