CVE-2023-22933 in Splunk
Summary
by MITRE • 02/14/2023
In Splunk Enterprise versions below 8.1.13, 8.2.10, and 9.0.4, a View allows for Cross-Site Scripting (XSS) in an extensible mark-up language (XML) View through the ‘layoutPanel’ attribute in the ‘module’ tag’. The vulnerability affects instances with Splunk Web enabled.
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Analysis
by VulDB Data Team • 03/16/2023
The vulnerability identified as CVE-2023-22933 represents a critical cross-site scripting flaw within Splunk Enterprise software that impacts multiple version ranges including those below 8.1.13, 8.2.10, and 9.0.4. This security weakness specifically manifests within the Splunk Web interface when processing XML views that utilize the 'layoutPanel' attribute within the 'module' tag structure. The flaw exists in the way Splunk Enterprise handles user-supplied input within XML configuration files, creating an avenue for malicious actors to inject malicious scripts that execute in the context of authenticated users' browsers. The vulnerability is particularly concerning as it affects the core web interface functionality that administrators and users rely upon for system monitoring and data analysis, making it a prime target for exploitation in targeted attacks.
The technical nature of this vulnerability stems from insufficient input validation and output encoding mechanisms within Splunk's XML view processing engine. When the system encounters XML content containing the 'layoutPanel' attribute within a 'module' tag, it fails to properly sanitize or escape user-provided data before rendering it within the web interface. This allows attackers to craft malicious XML payloads that, when processed by the vulnerable Splunk instance, result in script execution within the victim's browser context. The vulnerability maps directly to CWE-79 which defines Cross-Site Scripting as a weakness where untrusted data is incorporated into web pages without proper validation or encoding. The exploitation requires an attacker to either gain access to a Splunk instance with administrative privileges or to convince a legitimate user to interact with a maliciously crafted XML view, potentially through social engineering or by compromising a shared workspace.
The operational impact of CVE-2023-22933 extends beyond simple script injection as it can enable a wide range of subsequent attacks including session hijacking, data exfiltration, and privilege escalation within the Splunk environment. An attacker who successfully exploits this vulnerability can potentially access sensitive monitoring data, manipulate system configurations, or establish persistent access through stolen session tokens. The attack surface is particularly broad given that Splunk Web is typically enabled in production environments and often serves as a central hub for security monitoring and incident response activities. Organizations using Splunk for security operations center (SOC) functions face heightened risk as this vulnerability could allow attackers to bypass security controls that rely on Splunk's integrity for detecting and responding to threats. The vulnerability also aligns with ATT&CK technique T1566 which covers social engineering tactics, as attackers may exploit this weakness through crafted malicious XML files presented to unsuspecting users.
Organizations should immediately implement mitigations including updating to patched versions of Splunk Enterprise that address this vulnerability, specifically versions 8.1.13, 8.2.10, and 9.0.4 or later releases. Network segmentation and access controls should be strengthened to limit exposure of Splunk Web interfaces to untrusted networks, while monitoring should be enhanced to detect suspicious XML content or file uploads. Input validation should be implemented at multiple layers including web application firewalls and Splunk configuration policies to prevent malicious XML payloads from being processed. Additionally, security awareness training should be conducted to educate users about the risks of interacting with untrusted XML content, and regular security assessments should be performed to identify any potential exploitation attempts. The vulnerability also underscores the importance of maintaining up-to-date security patches and implementing comprehensive application security testing practices that include XML parsing and input validation scenarios.