CVE-2022-32153 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 described in CVE-2022-32153 represents a critical security flaw in Splunk Enterprise and Splunk Cloud Platform systems that undermines the integrity of peer-to-peer communications within Splunk deployments. This issue affects versions prior to 9.0 for Splunk Enterprise and 8.2.2203 for Splunk Cloud Platform, creating a significant attack surface where malicious actors can exploit the lack of proper certificate validation mechanisms. The flaw specifically targets the TLS certificate validation process during Splunk-to-Splunk communications, which is fundamental to maintaining secure data transmission between peer nodes in distributed Splunk environments. Organizations utilizing Splunk's distributed architecture are particularly at risk since peer communications form the backbone of data aggregation and search functionality across multiple nodes.
The technical implementation of this vulnerability stems from the default configuration of Splunk's TLS validation mechanisms, where certificate validation is not enforced during peer communications. This misconfiguration allows attackers with administrator privileges to introduce malicious peers into the network without proper certificate authentication, effectively bypassing the security controls designed to prevent unauthorized access to Splunk clusters. The vulnerability operates at the network protocol level where TLS handshakes occur between Splunk peers, creating a scenario where connections can be established even when certificates are invalid or self-signed. According to CWE-295, this represents a weakness in certificate validation where the system fails to properly validate the authenticity of certificates used in secure communications, directly enabling man-in-the-middle attacks and unauthorized node infiltration. The flaw aligns with ATT&CK technique T1071.004 which involves application layer protocol communication, specifically targeting the secure communication channels that maintain Splunk cluster integrity.
The operational impact of this vulnerability extends beyond simple credential compromise, as it enables attackers to establish persistent access points within Splunk environments through legitimate peer communication channels. When an attacker gains administrator access, they can add malicious peers with invalid certificates that will be accepted by the system due to the default insecure configuration. This creates a scenario where the attacker can potentially intercept, modify, or exfiltrate data flowing between Splunk peers without detection. The vulnerability is particularly dangerous in enterprise environments where Splunk clusters are used to monitor and analyze sensitive operational data, as it allows attackers to undermine the security of the entire distributed system. Organizations may experience data breaches, unauthorized access to logs and monitoring data, and potential lateral movement within their network infrastructure through the compromised peer connections.
The remediation strategy for CVE-2022-32153 requires immediate implementation of updated Splunk versions along with proper configuration of TLS hostname validation. Organizations must upgrade to Splunk Enterprise version 9.0 or Splunk Cloud Platform version 8.2.2203 to receive the patched certificate validation mechanisms. Additionally, administrators should configure TLS hostname validation for Splunk-to-Splunk communications as specified in the official Splunk documentation, which enforces proper certificate validation during peer connections. This configuration change addresses the root cause by ensuring that all peer communications require valid, properly signed certificates that match the expected hostnames. The mitigation approach aligns with security best practices outlined in NIST SP 800-57 for cryptographic key management and TLS protocol implementation, ensuring that certificate validation is enforced at the network level. Organizations should also conduct comprehensive security assessments to identify any existing misconfigured peers and verify that all Splunk cluster communications adhere to the new secure configuration standards. The vulnerability demonstrates the critical importance of proper TLS certificate validation in distributed systems and reinforces the need for regular security updates and configuration reviews to maintain robust security postures.