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 when a higher-privileged user views it, bypassing the external content restriction through a Cascading Style Sheets (CSS) injection. The Trusted Domains security check does not fully validate inline style attribute values, which can allow for outbound requests to untrusted domains and credential exfiltration when a victim views 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.
Fredrik Alexandersson (stok)
The full story
This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.
