CVE-2012-3513 in munin
Summary
by MITRE
munin-cgi-graph in Munin before 2.0.6, when running as a CGI module under Apache, allows remote attackers to load new configurations and create files in arbitrary directories via the logdir command.
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Analysis
by VulDB Data Team • 12/20/2021
The vulnerability identified as CVE-2012-3513 affects munin-cgi-graph, a component of the Munin monitoring system, specifically versions prior to 2.0.6. This issue manifests when the application operates as a CGI module within the Apache web server environment, creating a significant security risk for systems utilizing this monitoring framework. The flaw resides in the improper handling of user-supplied input parameters, particularly the logdir command, which enables unauthorized remote attackers to manipulate the application's behavior in ways that were not intended by the developers.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the munin-cgi-graph component. When the logdir command is processed, the application fails to properly validate or sanitize the directory path provided by the attacker. This lack of input filtering allows malicious actors to inject arbitrary directory paths that can result in the loading of new configuration files or the creation of files in locations outside the intended monitoring directories. The vulnerability essentially enables path traversal and arbitrary file operations through the web interface, bypassing normal access controls and permissions that should normally restrict such operations.
From an operational perspective, this vulnerability presents a severe threat to system integrity and security posture. Remote attackers who exploit this weakness can potentially establish persistent access points within monitored environments, create malicious configuration files that could alter monitoring behavior, or even inject malicious code into the monitoring infrastructure. The impact extends beyond simple privilege escalation as it allows for the manipulation of the entire monitoring ecosystem, potentially leading to data exfiltration, system compromise, or disruption of critical monitoring services. Organizations relying on Munin for infrastructure monitoring face significant risks, as this vulnerability can be exploited without authentication and from any location with network access to the affected web server.
The vulnerability maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal. This weakness allows attackers to access files and directories that are stored outside the intended directory, by manipulating input to redirect the application's file access. Additionally, this issue aligns with ATT&CK technique T1059.007, which covers the use of CGI scripts for command execution, as the vulnerable CGI component can be leveraged to perform unauthorized file system operations. Organizations should implement immediate mitigations including upgrading to Munin version 2.0.6 or later, where this vulnerability has been addressed through proper input validation. Additional protective measures include restricting network access to the affected CGI interfaces, implementing web application firewalls, and conducting thorough security audits of monitoring infrastructure to identify any potential exploitation attempts.