CVE-2023-22932 in Splunk
Summary
by MITRE • 02/14/2023
In Splunk Enterprise 9.0 versions before 9.0.4, a View allows for Cross-Site Scripting (XSS) through the error message in a Base64-encoded image. The vulnerability affects instances with Splunk Web enabled. It does not affect Splunk Enterprise versions below 9.0.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 03/16/2023
The vulnerability identified as CVE-2023-22932 represents a critical cross-site scripting flaw within Splunk Enterprise 9.0 versions prior to 9.0.4. This security weakness specifically targets the Splunk Web interface and exploits a flaw in how error messages are handled when processing Base64-encoded image data. The vulnerability arises from insufficient input validation and output encoding mechanisms within the Splunk Web application, creating an attack vector that allows malicious actors to inject arbitrary JavaScript code through crafted error messages. The flaw is particularly concerning because it leverages the Base64 image encoding process, which is commonly used for embedding images directly within web applications, making it a sophisticated attack method that can bypass traditional security controls.
The technical implementation of this vulnerability stems from improper sanitization of user-supplied data within the Splunk Web error handling mechanisms. When Splunk Enterprise encounters malformed image data during processing, it generates error messages that contain the Base64-encoded image content without adequate HTML escaping or sanitization. This creates an environment where malicious actors can craft specially formatted Base64 image data that, when processed by the application, results in XSS payloads being executed within the context of a victim's browser session. The vulnerability is classified under CWE-79 as a failure to sanitize or incorrectly sanitize input data, specifically manifesting as a cross-site scripting vulnerability in web applications. The attack requires minimal privileges and can be executed through standard web browser interactions, making it particularly dangerous in enterprise environments where Splunk Web is actively used for monitoring and analytics.
The operational impact of CVE-2023-22932 extends beyond simple script execution, as it provides attackers with potential access to sensitive data and system resources within the Splunk environment. Successful exploitation could enable attackers to steal session cookies, perform actions on behalf of authenticated users, access sensitive logs and monitoring data, or even escalate privileges within the Splunk infrastructure. The vulnerability affects organizations running Splunk Enterprise 9.0 versions below 9.0.4, where Splunk Web is enabled, creating a significant risk for enterprises that rely heavily on Splunk for security monitoring and log analysis. Given that Splunk is commonly used for security operations centers and threat detection, this vulnerability could provide attackers with access to critical security information and potentially allow for lateral movement within networks. The attack surface is particularly wide since Splunk Web interfaces are often accessible to multiple user roles and may be exposed to external networks, increasing the likelihood of exploitation.
Organizations should immediately implement mitigations to address this vulnerability, beginning with upgrading to Splunk Enterprise version 9.0.4 or later, which contains the necessary patches to prevent the XSS attack vector. Additionally, administrators should review and tighten access controls for Splunk Web interfaces, implement proper input validation at all entry points, and consider deploying web application firewalls to detect and block suspicious Base64-encoded data patterns. The mitigation strategy should also include regular security assessments of Splunk Web applications, monitoring for unusual error message patterns, and implementing proper output encoding for all user-supplied data. This vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1071.004 for application layer protocol usage, making it a significant concern for enterprise security teams implementing comprehensive threat detection and response strategies. Organizations should also conduct thorough security awareness training for administrators and users to recognize potential exploitation attempts and maintain regular patch management processes to prevent similar vulnerabilities from being exploited in the future.