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AUSCERT External Security Bulletin Redistribution
ESB-2022.5619
Risky command safeguards bypass via 'rex' search command
field names in Splunk Enterprise
7 November 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Splunk Enterprise
Publisher: Splunk
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Resolution: Patch/Upgrade
CVE Names: CVE-2022-43563
Original Bulletin:
https://www.splunk.com/en_us/product-security/announcements/svd-2022-1103.html
Comment: CVSS (Max): 8.1 CVE-2022-43563 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
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SPLUNK / PRODUCT SECURITY / SVD-2022-1103
Risky command safeguards bypass via 'rex' search command field names in Splunk
Enterprise
Advisory ID: CVE ID: CVE-2022-43563
SVD-2022-1103
Published: 2022-11-02 Last Update: 2022-11-02
CVSSv3.1 Score: CVSSv3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/
8.1, High I:H/A:N
CWE: CWE-20 Bug ID: SPL-223646
Description
In Splunk Enterprise versions below 8.2.9 and 8.1.12, the way that the 'rex'
search command handles field names lets an attacker bypass SPL safeguards for
risky commands . The vulnerability requires the attacker to phish the victim
by tricking them into initiating a request within their browser. The attacker
cannot exploit the vulnerability at will.
Solution
For Splunk Enterprise, upgrade versions to 8.1.12, 8.2.9, 9.0.2, or higher.
For Splunk Cloud Platform versions below 9.0.2203, Splunk is actively patching
and monitoring the Splunk Cloud instances. To request an immediate upgrade,
determine which version of Splunk Cloud Platform you're running , then create
a new support case .
Product Status
Product Version Component Affected Version Fixed Version
Splunk Enterprise 8.1 Search 8.1.11 and lower 8.1.12
Splunk Enterprise 8.2 Search 8.2.0 to 8.2.8 8.2.9
Splunk Enterprise 9.0 Search Not affected -
Splunk Cloud Platform - Search 9.0.2202 and lower 9.0.2203
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
Detections
None
Severity
Splunk rates the vulnerability as High, 8.1, with a CVSS Vectors of CVSS:3.1/
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N. The vulnerability requires a user
interaction within a browser of a privileged user. The vulnerability lets an
attacker run risky commands with permissions of a user who holds the "power"
Splunk role. For more information on risky commands and potential impacts, see
SPL safeguards for risky commands .
If the Splunk Enterprise instance does not run Splunk Web, there is no impact
and the severity is Informational.
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