CVE-2022-32152 in Splunk
Summary
by MITRE • 06/15/2022
Splunk Enterprise peers in Splunk Enterprise versions before 9.0 and Splunk Cloud Platform versions before 8.2.2203 did not validate the TLS certificates during Splunk-to-Splunk communications by default. Splunk peer communications configured properly with valid certificates were not vulnerable. However, an attacker with administrator credentials could add a peer without a valid certificate and connections from misconfigured nodes without valid certificates did not fail by default. For Splunk Enterprise, update to Splunk Enterprise version 9.0 and Configure TLS host name validation for Splunk-to-Splunk communications (https://docs.splunk.com/Documentation/Splunk/9.0.0/Security/EnableTLSCertHostnameValidation) to enable the remediation.
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Analysis
by VulDB Data Team • 06/15/2022
The vulnerability identified as CVE-2022-32152 represents a critical security flaw in Splunk Enterprise and Splunk Cloud Platform implementations that fundamentally undermines the integrity of peer-to-peer communications within Splunk deployments. This weakness specifically targets the Transport Layer Security certificate validation mechanisms that are essential for establishing secure connections between Splunk peers. The issue affects versions prior to Splunk Enterprise 9.0 and Splunk Cloud Platform 8.2.2203, creating a persistent risk for organizations that maintain older Splunk installations where proper certificate validation has not been explicitly configured.
The technical flaw manifests in the absence of mandatory TLS certificate validation during Splunk-to-Splunk communications, which creates a dangerous default configuration state where malicious actors can exploit the system's trust model. This vulnerability falls under CWE-295 which specifically addresses "Improper Certificate Validation" and aligns with ATT&CK technique T1071.004 for Application Layer Protocol: DNS, as it enables attackers to potentially establish unauthorized communication channels within the Splunk infrastructure. When an attacker gains administrator privileges, they can deliberately introduce peer nodes with invalid or self-signed certificates that would normally be rejected by proper validation mechanisms. The system's default behavior of accepting these misconfigured connections creates an attack surface where man-in-the-middle scenarios become possible without detection.
The operational impact of this vulnerability extends beyond simple certificate validation failures, as it fundamentally compromises the security posture of Splunk deployments by enabling unauthorized entities to potentially intercept, modify, or inject data into Splunk peer communications. Organizations using affected Splunk versions face significant risk of data exposure, integrity compromise, and potential lateral movement within their network infrastructure if attackers can leverage this vulnerability to establish malicious peer connections. The vulnerability's exploitation requires only administrator-level credentials, making it particularly dangerous as it can be leveraged by insiders or compromised administrator accounts to create persistent backdoors within Splunk environments.
The remediation approach for CVE-2022-32152 requires immediate action to upgrade to Splunk Enterprise version 9.0 or Splunk Cloud Platform 8.2.2203, which includes the necessary security enhancements to properly validate TLS certificates during peer communications. Additionally, organizations must explicitly configure TLS hostname validation for Splunk-to-Splunk communications as outlined in the official Splunk documentation, which addresses the underlying CWE-295 issue by implementing proper certificate verification mechanisms. This configuration change ensures that all peer connections must present valid certificates that match the expected hostnames, preventing attackers from introducing malicious nodes with invalid certificates. The remediation process also aligns with security best practices for implementing certificate-based authentication and should be complemented by regular security audits to verify that all Splunk peers maintain proper certificate validation settings.