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AUSCERT External Security Bulletin Redistribution
ESB-2023.1007
SVD-2023-0210: SPL Command Safeguards Bypass via the
'collect' SPL Command Aliases in Splunk Enterprise
17 February 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Splunk Enterprise
Publisher: Splunk
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Resolution: Patch/Upgrade
CVE Names: CVE-2023-22940
Original Bulletin:
https://advisory.splunk.com//advisories/SVD-2023-0210
Comment: CVSS (Max): 6.3 CVE-2023-22940 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N)
CVSS Source: Splunk
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
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SPL Command Safeguards Bypass via the 'collect' SPL Command Aliases in Splunk
Enterprise
Advisory ID: SVD-2023-0210
CVE ID: CVE-2023-22940
Published: 2023-02-14
Last Update: 2023-02-14
CVSSv3.1 Score: 6.3, Medium
CVSSv3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
CWE: CWE-20
Bug ID: SPL-232369
Description
In Splunk Enterprise versions below 8.1.13, 8.2.10, and 9.0.4, aliases of the
'collect' search processing language (SPL) command, including 'summaryindex',
'sumindex', 'stash',' mcollect', and 'meventcollect', were not designated as
safeguarded commands. The commands could potentially allow for the exposing of
data to a summary index that unprivileged users could access. The vulnerability
requires a higher privileged user to initiate a request within their browser,
and only affects instances with Splunk Web enabled.
Solution
For Splunk Enterprise, upgrade versions to 8.1.13, 8.2.10, 9.0.4, or higher.
For Splunk Cloud Platform, Splunk is actively patching and monitoring the
Splunk Cloud instances.
Product Status
Product Version Component Affected Version Fix Version
Splunk Enterprise 8.1 Splunk Web 8.1.12 and lower 8.1.13
Splunk Enterprise 8.2 Splunk Web 8.2.0 to 8.2.9 8.2.10
Splunk Enterprise 9.0 Splunk Web 9.0.0 to 9.0.3 9.0.4
Splunk Cloud Platform - Splunk Web 9.0.2209 and lower 9.0.2212
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
o Splunk Risky Command Abuse disclosed February 2023
This hunting search provides information on potential abuse of the 'collect'
SPL command.
Severity
Splunk rated the vulnerability as Medium, 6.3, with a CVSSv3.1 vector of
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N. The 'collect' aliases have
limited write capabilities, but could write confidential data to a summary
index that all users can access, such as the default summary index.
If the Splunk Enterprise instance does not run Splunk Web, there is no impact
and the severity is Informational.
Acknowledgments
James Ervin, Splunk
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