CVE-2022-43562 in Splunk
Summary
by MITRE • 11/05/2022
In Splunk Enterprise versions below 8.1.12, 8.2.9, and 9.0.2, Splunk Enterprise fails to properly validate and escape the Host header, which could let a remote authenticated user conduct various attacks against the system, including cross-site scripting and cache poisoning.
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Analysis
by VulDB Data Team • 12/05/2022
The vulnerability identified as CVE-2022-43562 affects Splunk Enterprise installations running versions prior to 8.1.12, 8.2.9, and 9.0.2, representing a critical security flaw in the platform's handling of HTTP headers. This issue stems from inadequate validation and sanitization of the Host header parameter within the web application layer, creating a pathway for malicious actors to exploit the system through authenticated sessions.
The technical flaw manifests in the improper processing of the Host header field, which is typically used by web servers to determine which virtual host should receive a request. In Splunk Enterprise's case, the application fails to adequately sanitize this input before using it in subsequent operations, particularly in contexts where the header value might be reflected in user-facing content or used to construct URLs. This weakness directly maps to CWE-79, Cross-Site Scripting, and CWE-93, Improper Neutralization of CRLF Sequences in HTTP Headers, as the unvalidated Host header can be manipulated to inject malicious content into web responses.
The operational impact of this vulnerability extends beyond simple XSS attacks, as it enables cache poisoning scenarios that can affect multiple users within the Splunk environment. An authenticated attacker with access to the system can craft malicious Host header values that, when processed by Splunk, could result in stored XSS payloads being executed in other users' browsers. Additionally, the vulnerability allows for HTTP response splitting attacks where attackers can manipulate the Host header to inject malicious CRLF sequences that could be used to poison HTTP caches or redirect traffic to malicious destinations.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, as the XSS component could enable attackers to execute malicious JavaScript within user sessions. The authentication requirement reduces the attack surface compared to unauthenticated vulnerabilities, but the potential for privilege escalation through session manipulation remains significant. The vulnerability affects both the web interface and API endpoints that process HTTP requests, making it particularly dangerous in environments where Splunk is used for log aggregation and security monitoring.
Organizations should prioritize immediate patching of affected Splunk Enterprise installations to address this vulnerability, as the combination of authenticated access requirements with the broad attack surface makes this issue particularly concerning. The remediation process should include not only updating to the patched versions but also implementing additional monitoring for suspicious Host header values in web server logs. Network segmentation and access controls should be reviewed to limit the potential impact of successful exploitation, particularly in environments where Splunk serves as a central security monitoring platform. Security teams should also conduct thorough vulnerability assessments to identify any potential exploitation attempts that may have occurred prior to patching.