CVE-2021-3422: Indexer denial-of-service via malformed S2S request
First published: Fri Mar 25 2022(Updated: )
The lack of validation of a key-value field in the Splunk-to-Splunk protocol results in a denial-of-service in Splunk Enterprise instances configured to index Universal Forwarder traffic. The vulnerability impacts Splunk Enterprise versions before 7.3.9, 8.0 versions before 8.0.9, and 8.1 versions before 8.1.3. It does not impact Universal Forwarders. When Splunk forwarding is secured using TLS or a Token, the attack requires compromising the certificate or token, or both. Implementation of either or both reduces the severity to Medium.
Credit: prodsec@splunk.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Splunk | <7.3.9 | |
| Splunk | >=8.0<8.0.9 | |
| Splunk | >=8.1<8.1.3 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-3422?
CVE-2021-3422 has a medium severity rating due to its potential to cause a denial-of-service in affected Splunk Enterprise instances.
How do I fix CVE-2021-3422?
To fix CVE-2021-3422, upgrade your Splunk Enterprise instances to versions 7.3.9, 8.0.9, or 8.1.3 or later.
Which versions of Splunk Enterprise are affected by CVE-2021-3422?
CVE-2021-3422 affects Splunk Enterprise versions prior to 7.3.9 and 8.0 versions before 8.0.9.
Is CVE-2021-3422 exploitable remotely?
Yes, CVE-2021-3422 can be exploited remotely by sending specially crafted requests to the Splunk-to-Splunk protocol.
What impact does CVE-2021-3422 have on Splunk services?
CVE-2021-3422 can lead to a denial-of-service condition, disrupting Splunk Enterprise operations when indexing Universal Forwarder traffic.
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