Path Traversal in Munin munin-httpd

Executive Summary

This vulnerability is a path traversal issue in Munin's munin-httpd component (versions 2.99.1 through 2.999.18). It allows unauthenticated attackers to read files outside the static directory by exploiting weak path validation. Attackers can craft requests like /static/../<file> to bypass checks and access sensitive files such as munin.conf or plugin configurations containing credentials for monitored services.

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Detection Guidance

To detect this vulnerability, check if your Munin version is between 2.99.1 and 2.999.18. Test for path traversal by sending requests like curl http://<target>/static/../etc/munin/munin.conf. If the server returns the file content, the system is vulnerable.

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Impact Analysis

An attacker could exploit this to read sensitive files on the server, including configuration files with credentials for monitored services. This may lead to unauthorized access, data breaches, or further compromise of the system. The impact depends on the exposed files and services.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating GDPR (data protection) or HIPAA (health information privacy) if credentials or monitored service data are exposed. Compliance may be impacted if the breach results in data leaks or unauthorized access to regulated information.

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Mitigation Strategies

Upgrade Munin to a version beyond 2.999.18 where the path traversal issue is fixed. Alternatively, restrict access to munin-httpd or disable it if not required. Ensure no sensitive files are exposed in the static directory.

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