CVE-2011-4642 in Splunk
Summary
by MITRE
mappy.py in Splunk Web in Splunk 4.2.x before 4.2.5 does not properly restrict use of the mappy command to access Python classes, which allows remote authenticated administrators to execute arbitrary code by leveraging the sys module in a request to the search application, as demonstrated by a cross-site request forgery (CSRF) attack, aka SPL-45172.
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Analysis
by VulDB Data Team • 11/16/2024
The vulnerability CVE-2011-4642 represents a critical privilege escalation and arbitrary code execution flaw in Splunk Web's mappy.py component. This issue affects Splunk versions 4.2.x prior to 4.2.5 and specifically targets the search application's handling of Python class access through the mappy command. The flaw stems from insufficient input validation and access control mechanisms that fail to properly restrict the use of Python classes, creating a dangerous pathway for authenticated administrators to bypass intended security boundaries.
The technical exploitation of this vulnerability occurs through a carefully crafted request that leverages the sys module within the search application context. When an authenticated administrator makes a request containing malicious parameters, the mappy.py script fails to properly validate or sanitize the input, allowing the attacker to access restricted Python classes and execute arbitrary code on the system. This represents a classic case of improper access control where the system fails to enforce the principle of least privilege, enabling unauthorized code execution through legitimate administrative interfaces.
The operational impact of this vulnerability is severe as it transforms a legitimate administrative account into a full system compromise vector. An attacker who can authenticate to Splunk Web with administrative privileges can leverage this flaw to execute arbitrary commands, potentially leading to complete system compromise, data exfiltration, or further lateral movement within the network. The vulnerability's exploitation through cross-site request forgery techniques means that an attacker could potentially trick an authenticated administrator into executing malicious code without their knowledge, making the attack surface even broader.
This vulnerability aligns with CWE-285, which addresses improper authorization in the context of privilege escalation, and demonstrates characteristics of ATT&CK technique T1059 for execution through Python commands. The flaw represents a failure in input sanitization and access control validation that violates fundamental security principles. Organizations using affected Splunk versions face significant risk as the vulnerability allows for code execution at the system level, potentially enabling attackers to install backdoors, modify system configurations, or access sensitive data stored within the Splunk environment.
The recommended mitigation strategy involves upgrading to Splunk 4.2.5 or later versions where the vulnerability has been patched. Additionally, organizations should implement network segmentation to limit access to Splunk Web interfaces, enforce strict access controls for administrative accounts, and monitor for suspicious activity patterns in search application usage. Security teams should also consider implementing web application firewalls and additional logging mechanisms to detect potential exploitation attempts. The vulnerability underscores the importance of proper input validation and access control implementation in web applications, particularly those handling privileged operations and system-level access.