Denial of Service of an Investigation in Splunk Enterprise Security through Investigation attachments

Description

In Splunk Enterprise Security (ES) versions below 7.1.2, an attacker can use investigation attachments to perform a denial of service (DoS) to the investigation. The attachment endpoint does not properly limit the size of the request, which lets an attacker cause the investigation to become inaccessible.
The vulnerability requires the authenticated, collaborator access to the Investigation and only affects the availability of an affected Investigation.

Solution

Upgrade Splunk Enterprise Security (ES) to versions 7.1.2, 7.2.0, 7.3.0 or higher.

Product Status

Mitigations and Workarounds

N/A

Detections

• Splunk ES DoS Through Investigation Attachments

Severity

Splunk rates this vulnerability a 4.3, Medium, with a CVSSv3.1 vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Acknowledgments

Vikram Ashtaputre, Splunk