ValidateArgumentType RPC Endpoint Authentication Bypass in OliveTin

Executive Summary

This vulnerability exists in OliveTin versions 3000.0.0 and prior, where the ValidateArgumentType RPC endpoint does not perform any authentication or authorization checks. Unlike other API endpoints, it does not verify the user's identity or access rights. As a result, even when the security setting AuthRequireGuestsToLogin is enabled, unauthenticated users can access this endpoint.

This allows attackers to use the endpoint as an oracle to enumerate valid action binding IDs and their argument configurations, potentially revealing sensitive information about the system's internal commands.

The issue was fixed in version 3000.13.0.

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Impact Analysis

The vulnerability can impact you by allowing unauthenticated users to gain information about valid action bindings and their argument configurations through the vulnerable API endpoint.

Although the CVSS score indicates a low severity (3.7) with limited impact (confidentiality impact only), this information disclosure could be leveraged by attackers to plan further attacks or exploit other vulnerabilities.

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Mitigation Strategies

To mitigate this vulnerability, upgrade OliveTin to version 3000.13.0 or later, where the issue has been fixed.

Additionally, ensure that the AuthRequireGuestsToLogin setting is properly configured and consider restricting access to the ValidateArgumentType RPC endpoint until the upgrade is applied.

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Detection Guidance

This vulnerability involves the ValidateArgumentType RPC endpoint in OliveTin versions 3000.0.0 and prior, which does not perform authentication or authorization checks. To detect if your system is vulnerable, you can attempt to access this endpoint without authentication and observe if it returns data.

A possible detection method is to send an unauthenticated request to the ValidateArgumentType RPC endpoint and check if it responds with valid action binding IDs or argument configurations.

• Use a command like: curl -X POST http://<target-host>/service/internal/api/ValidateArgumentType -d '{}' -v
• If the response returns data without requiring authentication, the system is likely vulnerable.

Note that this endpoint should require authentication in secure configurations, so any unauthenticated access indicates the presence of the vulnerability.

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Compliance Impact

This vulnerability allows unauthenticated users to access the ValidateArgumentType RPC endpoint, which can be used to enumerate valid action binding IDs and their argument configurations. However, the CVE description does not provide specific information about the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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