Splunk: CVE-2024-36987: Insecure File Upload in the indexing/preview REST endpoint

In Splunk Enterprise versions below 9.2.2, 9.1.5, and 9.0.10 and Splunk Cloud Platform versions below 9.1.2312.200, an authenticated, low-privileged user who does not hold the “admin” or “power” Splunk roles could upload a file with an arbitrary extension using the indexing/preview REST endpoint.The vulnerable endpoint is one of several that the Upload Data page in Splunk Web uses to run a “preview” search of the data contained within a file that a user uploads prior to indexing. This process generates a file that a low-privileged user could use to perform the XSLT injection, which could be used to perform downstream exploits.