In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, and Splunk Cloud Platform versions below 10.3.2512.13, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132, a low-privileged user that does not hold the “admin” or “power” Splunk roles could craft a malicious classic dashboard that exfiltrates sensitive data to an external server.
The vulnerability exists because URL validation on the external content dialog is incomplete, which can allow for requests to untrusted domains when a user interacts with a crafted dashboard.
See Classic Dashboards Trusted Domains List and role-based user access in the Splunk documentation for more information.
Upgrade Splunk Enterprise to versions 10.4.0, 10.2.4, 10.0.7, 9.4.12, and 9.3.13, or higher. Splunk is actively monitoring and patching Splunk Cloud Platform instances.
Configure the Dashboards Trusted Domains List to restrict which external domains dashboards can load content from. See Classic Dashboards Trusted Domains List in the Splunk documentation. Review and restrict which roles have permission to create and edit classic dashboards. See role-based user access in the Splunk documentation.
Splunk rates this vulnerability a 5.7, Medium, with a CVSSv3.1 vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.
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