CVE-2018-7431 in Splunk
Summary
by MITRE
Directory traversal vulnerability in the Splunk Django App in Splunk Enterprise 6.0.x before 6.0.14, 6.1.x before 6.1.13, 6.2.x before 6.2.14, 6.3.x before 6.3.10, 6.4.x before 6.4.6, and 6.5.x before 6.5.3; and Splunk Light before 6.6.0 allows remote authenticated users to read arbitrary files via unspecified vectors.
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Analysis
by VulDB Data Team • 05/30/2023
The CVE-2018-7431 vulnerability represents a critical directory traversal flaw within Splunk Enterprise and Splunk Light products, affecting multiple version streams from 6.0.x through 6.5.x. This vulnerability resides within the Splunk Django App component, which serves as a core web application framework for Splunk's user interface and administrative functions. The flaw enables remote authenticated attackers to exploit insufficient input validation mechanisms that fail to properly sanitize user-supplied data before processing file system operations. Attackers can leverage this weakness to access arbitrary files on the underlying operating system, potentially exposing sensitive configuration data, log files, and other system resources that should remain protected from unauthorized access.
The technical implementation of this vulnerability stems from inadequate validation of file path inputs within the Django application's file handling routines. When users submit requests containing specially crafted file paths, the application fails to properly sanitize or validate these inputs before performing file system operations. This allows attackers to manipulate path resolution mechanisms through techniques such as directory traversal sequences like "../" or equivalent path manipulation constructs. The vulnerability operates at the application layer and requires authentication credentials to exploit, making it a privilege escalation issue rather than a purely remote code execution flaw. According to CWE classification, this maps to CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which specifically addresses inadequate controls over file system path resolution.
The operational impact of CVE-2018-7431 extends significantly beyond simple information disclosure. An authenticated attacker with access to Splunk's web interface can potentially retrieve sensitive system information including password hashes, configuration files containing database credentials, system logs, and other confidential data that may reveal network topology or system architecture details. This information can serve as a foundation for further attacks, potentially enabling lateral movement within the network or privilege escalation to system-level access. The vulnerability affects organizations that rely on Splunk for security monitoring and log analysis, creating a significant risk as attackers could access the very data that Splunk is designed to protect and analyze. The affected versions span multiple major releases, indicating this was a persistent issue that required patching across several software branches.
Organizations should implement immediate mitigation strategies including applying the vendor-provided patches for all affected Splunk versions, as well as implementing network-level controls to restrict access to Splunk web interfaces where possible. Security teams should also conduct thorough audits of Splunk configurations to ensure that authentication mechanisms are properly hardened and that least privilege principles are enforced. The vulnerability demonstrates the importance of input validation and proper path handling in web applications, aligning with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.001 for credential access through exploitation of vulnerabilities. Additionally, organizations should consider implementing web application firewalls and monitoring for suspicious file access patterns that may indicate exploitation attempts. The patching process should be prioritized immediately, as the vulnerability exists in multiple version streams requiring comprehensive remediation across all affected installations.