Executive Summary

The vulnerability in tufantunc ssh-mcp up to version 1.5.0 involves insecure handling of SSH credentials. Specifically, passwords for SSH login, sudo, and su are passed as command-line arguments when starting the ssh-mcp service. Because on Linux systems process command-line arguments are accessible to any local user through commands like 'ps aux' or by reading the '/proc/<pid>/cmdline' file, an unprivileged local attacker can easily retrieve these plaintext passwords.

This exposure happens in the Command Line Handler component, particularly in the 'src/index.ts' file where these password arguments are parsed and used. The vulnerability allows local attackers to obtain sensitive credentials directly from the running process, violating secure secret management principles.

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Impact Analysis

This vulnerability can lead to credential leakage of SSH, sudo, and su passwords to any local user on the affected system. An attacker with local access can retrieve these plaintext passwords from the process command line, potentially allowing unauthorized access to SSH sessions, privilege escalation via sudo, or persistent root access via su.

Such credential exposure increases the risk of unauthorized system access, data compromise, and further attacks within the environment. Since the exploit requires local access, remote attackers cannot directly exploit it without first gaining local presence.

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Detection Guidance

This vulnerability can be detected by checking if the ssh-mcp process is running with passwords passed as command-line arguments, which exposes them to local users.

You can identify the process ID of ssh-mcp using commands like:

• pgrep -f ssh-mcp

Then, inspect the full command line of the process to see if sensitive passwords are visible:

• ps -fp <pid>
• cat /proc/<pid>/cmdline | tr '\0' ' '

If passwords appear in the command line arguments (e.g., --password=, --sudoPassword=, --suPassword=), the vulnerability is present.

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Mitigation Strategies

To mitigate this vulnerability immediately, avoid passing sensitive credentials such as SSH, sudo, and su passwords via command-line arguments when starting the ssh-mcp service.

Instead, use more secure methods of credential management that do not expose passwords in process listings or procfs.

Restrict local user access to the system to prevent unauthorized users from viewing process command lines.

Monitor and audit running processes regularly to detect any exposure of credentials.

Consider disabling or limiting the use of password-based authentication in favor of SSH key authentication where possible.

Stay updated with the ssh-mcp project for any patches or official fixes addressing this issue.

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Compliance Impact

The vulnerability in ssh-mcp exposes SSH, sudo, and su passwords in plaintext to any local user by passing them as command-line arguments, which can be viewed through standard process inspection tools. This insecure handling of sensitive credentials violates secure secret management principles.

Such exposure of credentials can lead to unauthorized access and potential data breaches, which may result in non-compliance with common security standards and regulations like GDPR and HIPAA that require protection of sensitive information and credentials.

Because the vulnerability allows local attackers to retrieve plaintext passwords, it undermines confidentiality controls and could lead to violations of regulatory requirements for protecting access credentials and preventing unauthorized access to systems and data.

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