CVE-2011-4643 in Splunk
Summary
by MITRE
Multiple directory traversal vulnerabilities in Splunk 4.x before 4.2.5 allow remote authenticated users to read arbitrary files via a .. (dot dot) in a URI to (1) Splunk Web or (2) the Splunkd HTTP Server, aka SPL-45243.
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Analysis
by VulDB Data Team • 11/10/2024
The vulnerability CVE-2011-4643 represents a critical directory traversal flaw affecting Splunk 4.x versions prior to 4.2.5, specifically impacting both Splunk Web and the Splunkd HTTP Server components. This vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied URI parameters containing directory traversal sequences. The flaw allows authenticated remote attackers to exploit the system by crafting malicious URIs that include .. (dot dot) sequences, enabling them to navigate beyond the intended directory structure and access arbitrary files on the underlying filesystem. The vulnerability affects the core web interface functionality and the underlying HTTP server implementation, creating a significant attack surface that could potentially expose sensitive system information, configuration files, and user data.
The technical implementation of this directory traversal vulnerability occurs when the Splunk web applications process URI requests without sufficient validation of path components. When an attacker submits a crafted URI containing directory traversal sequences such as ../../etc/passwd or similar patterns, the application fails to properly resolve these paths, allowing access to files outside the intended web root directory. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability is particularly dangerous because it requires only authentication, meaning that any authenticated user within the Splunk system could potentially exploit this flaw, escalating their privileges to access unauthorized files and information.
The operational impact of CVE-2011-4643 extends beyond simple file access, as it can enable attackers to extract sensitive information from the compromised Splunk environment. An attacker could potentially access configuration files containing database credentials, API keys, or other sensitive authentication material that could be used for further attacks. Additionally, the vulnerability could allow access to log files that might contain user session information, system logs, or other sensitive operational data. The attack vector is particularly concerning for organizations relying on Splunk for security monitoring, as the exploitation could lead to complete compromise of the logging infrastructure and potential exfiltration of security-relevant data. This vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachment) as attackers could leverage this to gather intelligence for more sophisticated attacks.
Organizations should implement immediate mitigations including upgrading to Splunk version 4.2.5 or later, which contains patches addressing the directory traversal vulnerability. Network segmentation and access controls should be strengthened to limit authentication access to Splunk systems, reducing the attack surface available to potential exploiters. Input validation mechanisms should be enhanced at the application level to properly sanitize all URI parameters before processing, implementing strict path validation that prevents traversal sequences from being processed. Security monitoring should be enhanced to detect suspicious URI patterns and unusual file access attempts that could indicate exploitation attempts. System administrators should also conduct thorough audits of Splunk configurations and review access controls to ensure that only authorized personnel have necessary access privileges, implementing the principle of least privilege to minimize potential damage from successful exploitation attempts.