Command Injection using External Lookups

Description

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.

Solution

Upgrade Splunk Enterprise to versions 9.2.2, 9.1.5, and 9.0.10, or higher.

Splunk is performing upgrades on Splunk Cloud Platform instances as part of Emergency Maintenance for customers, as described in the Splunk Cloud Platform Maintenance Policy. In the meantime, Splunk is actively monitoring for potential issues that could arise from this vulnerability.

Product Status

Mitigations and Workarounds

None

Detections

• Splunk Command and Scripting Interpreter Risky Commands

Severity

Splunk rates this vulnerability as 8.0, High, with a CVSSv3.1 vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:HH.

Acknowledgments

Danylo Dmytriiev (DDV_UA)