SSH Admin Shell Access in Apache Guacamole

Executive Summary

This vulnerability allows any authenticated user in the SSH administration service's login domain to gain full access to the administration shell without requiring an administrative role. An attacker with valid credentials for even a low-privileged user can execute arbitrary code as the server process.

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Detection Guidance

Check if the SSH administration service is running by inspecting active services or listening ports. Look for processes named related to SSH admin or TomEE. Verify if the service is exposed to untrusted networks by checking firewall rules or network interfaces.

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Impact Analysis

An attacker could take complete control of the server by exploiting this flaw, leading to data breaches, unauthorized modifications, or service disruption. Even low-privileged users pose a significant risk if their credentials are compromised.

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Compliance Impact

This vulnerability could lead to unauthorized access and data exposure, violating confidentiality requirements in GDPR and HIPAA. Organizations may face compliance penalties, legal consequences, and reputational damage if exploited.

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Mitigation Strategies

Disable the SSH administration service immediately. Block network access to it from untrusted clients. Restrict its login domain to only administrative users. Ensure no low-privileged users have access.

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