Persistent Cross-Site Scripting in “Save Table” Dialog in Splunk Enterprise

Description

In Splunk Enterprise versions below 8.1.12, 8.2.9, and 9.0.2, a remote user that holds the “power” Splunk role can store arbitrary scripts that can lead to persistent cross-site scripting (XSS). The vulnerability affects instances with Splunk Web enabled.

Solution

For Splunk Enterprise, upgrade versions to 8.1.12, 8.2.9, 9.0.2, or higher.

For Splunk Cloud Platform, Splunk is actively patching and monitoring the Splunk Cloud instances.

Product Status

Mitigations and Workarounds

If users do not log in to Splunk Web on indexers in a distributed environment, disable Splunk Web on those indexers. See Disable unnecessary Splunk Enterprise components and the web.conf configuration specification file for more information on disabling Splunk Web.

Detections

• Splunk XSS in “Save Table” dialog header in search/table page

This is a detection search to find persistent XSS that was included while inputting data in the ‘Save Table’ dialog in the affected versions of Splunk Enterprise.

Severity

Splunk rated the vulnerability as Medium. The vulnerability lets a remote authenticated user with the power role to store arbitrary scripts, but exploitation requires a multistep process by the victim. Hence, Splunk scored the vulnerability as 6.4 with a CVSSv3.1 vector of CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H.

If the Splunk Enterprise instance does not run Splunk Web, there is no impact and the severity is Informational.

Acknowledgments

Mr Hack (try_to_hack)