CVE-2022-43565 in Splunk
Summary
by MITRE • 11/05/2022
In Splunk Enterprise versions below 8.2.9 and 8.1.12, the way that the ‘tstats command handles Javascript Object Notation (JSON) lets an attacker bypass SPL safeguards for risky commands https://docs.splunk.com/Documentation/SplunkCloud/latest/Security/SPLsafeguards . The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser.
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Analysis
by VulDB Data Team • 12/04/2022
The vulnerability identified as CVE-2022-43565 affects Splunk Enterprise versions prior to 8.2.9 and 8.1.12, representing a critical security flaw in the platform's handling of JSON data within the tstats command. This vulnerability specifically targets the security mechanisms that are designed to protect against dangerous SPL commands, creating a pathway for attackers to circumvent these protective measures. The flaw exists in how Splunk processes JavaScript Object Notation data structures when executing statistical commands, allowing malicious actors to exploit the system's trust model and gain unauthorized access to restricted functionalities.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the tstats command's JSON processing pipeline. When Splunk receives JSON formatted data through the tstats command, the system fails to properly validate the structure and content of the incoming data, particularly in how it interprets and executes JSON objects that may contain malicious payloads. This weakness enables attackers to craft specially formatted JSON requests that can bypass the built-in SPL safeguards designed to prevent execution of potentially harmful commands. The vulnerability operates through a sophisticated manipulation of the JSON parsing logic that allows attackers to inject commands that would normally be blocked by the security controls.
The operational impact of this vulnerability is significant as it allows attackers to perform unauthorized actions within the Splunk environment without detection. An attacker can exploit this flaw by tricking victims into executing malicious requests through social engineering techniques, particularly phishing campaigns that prompt users to initiate browser-based requests containing the crafted JSON payloads. This approach leverages the victim's authenticated session and elevated privileges, potentially allowing unauthorized access to sensitive data, execution of arbitrary commands, and privilege escalation within the Splunk platform. The vulnerability essentially undermines the core security model of Splunk's access controls and command execution restrictions.
Organizations affected by CVE-2022-43565 should immediately implement mitigations including upgrading to Splunk Enterprise versions 8.2.9 or 8.1.12, which contain patches addressing the JSON handling flaw. Security teams should also review and strengthen their phishing detection capabilities, as the attack vector relies heavily on social engineering to deliver malicious payloads. Network monitoring should be enhanced to detect unusual JSON processing patterns within Splunk environments, and administrators should conduct thorough audits of existing SPL commands to identify any potentially vulnerable configurations. The vulnerability aligns with CWE-20 Improper Input Validation and follows attack patterns consistent with those documented in the MITRE ATT&CK framework under techniques related to privilege escalation and command execution. Organizations should also consider implementing additional security controls such as web application firewalls and strict access controls to limit potential exploitation of this vulnerability across their Splunk deployments.