Remote Code Execution (RCE) through an external lookup due to “copybuckets.py“ script in the “splunk_archiver“ application in Splunk Enterprise
Advisory ID: SVD-2024-0705
CVE ID: CVE-2024-36985
Published: 2024-07-01
Last Update: 2024-07-01
CVSSv3.1 Score: 8.8, High
CVSSv3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-687
Bug ID: VULN-8937
Description
In Splunk Enterprise versions below 9.0.10, 9.1.5, and 9.2.2, a low-privileged user that does not hold the “admin“ or “power“ Splunk roles could cause a Remote Code Execution through an external lookup that likely references the “splunk_archiver“ application.
The “splunk_archiver“ application likely contains a script called “copybuckets.py“ that itself references a file called “erp_launcher.py“, which would likely execute a script called “sudobash“.
The “sudobash“ script does not perform any input checking. Therefore it runs a bash shell with arguments supplied by the “erp_launcher.py“ file. This can lead to an RCE.
Solution
Upgrade Splunk Enterprise to versions 9.2.2, 9.1.5, and 9.0.10, or higher.
Product Status
| Product | Version | Component | Affected Version | Fix Version |
|---|---|---|---|---|
| Splunk Enterprise | 9.2 | splunk_archiver | 9.2.0 to 9.2.1 | 9.2.2 |
| Splunk Enterprise | 9.1 | splunk_archiver | 9.1.0 to 9.1.4 | 9.1.5 |
| Splunk Enterprise | 9.0 | splunk_archiver | 9.0.0 to 9.0.9 | 9.0.10 |
Mitigations and Workarounds
Disable the “splunk_archiver“ application
Detections
Severity
Splunk rates this vulnerability as 8.8, High, with a CVSSv3.1 vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
If the Splunk Enterprise instance disabled splunk_archiver, there is no impact and the severity is Informational.
Acknowledgments
Alex Hordijk