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AUSCERT External Security Bulletin Redistribution
ESB-2022.5628
Indexing blockage via malformed data sent through S2S or HEC
protocols 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-2022-43572
Original Bulletin:
https://www.splunk.com/en_us/product-security/announcements/svd-2022-1112.html
Comment: CVSS (Max): 7.5 CVE-2022-43572 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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SPLUNK / PRODUCT SECURITY / SVD-2022-1112
Indexing blockage via malformed data sent through S2S or HEC protocols in
Splunk Enterprise
Advisory ID: CVE ID: CVE-2022-43572
SVD-2022-1112
Published: 2022-11-02 Last Update: 2022-11-02
CVSSv3.1 Score: 7.5 CVSSv3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/
High I:N/A:H
CWE: CWE-400 Bug ID: SPL-224974
Description
In Splunk Enterprise versions below 8.2.9, 8.1.12, and 9.0.2, sending a
malformed file through the Splunk-to-Splunk (S2S) or HTTP Event Collector
(HEC) protocols to an indexer results in a blockage or denial-of-service
preventing further indexing.
Solution
For Splunk Enterprise, upgrade versions to 8.1.12, 8.2.9, 9.0.2, or higher.
For Splunk Cloud Platform versions below 9.0.2211, 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 Indexing 8.1.11 and lower 8.1.12
Splunk Enterprise 8.2 Indexing 8.2.0 to 8.2.8 8.2.9
Splunk Enterprise 9.0 Indexing 9.0.0 to 9.0.1 9.0.2
Splunk Cloud Platform - Indexing 9.0.2209 and lower 9.0.2211
Mitigations and Workarounds
Configure Splunk indexing and forwarding to use TLS certificates partially
mitigates the vulnerability and increases the complexity of the vulnerability,
which reduces the severity to Medium.
Detections
None
Severity
Splunk rates the vulnerability as High, 7.5, with a CVSS Vector of CVSS:3.1/
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
If you have Configured Splunk indexing and forwarding to use TLS certificates,
the vulnerability requires compromise of a HEC token, a pass4symmkey, a
universal forwarder or client private certificate (when enabled), or a
certificate authority certificate chain. These requirements increase the
complexity of the attack and prevent an attacker from exploiting the
vulnerability without putting in a meaningful amount of preparation reducing
the severity to Medium, 5.9 with a CVSS Vector of CVSS:3.1/AV:N/AC:H/PR:N/UI:N
/S:U/C:N/I:N/A:H.
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