Executive Summary

The vulnerability exists in Homarr, an open-source dashboard, in versions prior to 1.52.0. A public and unauthenticated tRPC endpoint named widget.app.ping accepts an arbitrary URL and performs a server-side request to that URL. This behavior allows an attacker without authentication to make the Homarr server send outbound HTTP requests to any URL they choose.

This leads to Server-Side Request Forgery (SSRF), where the attacker can make the server interact with internal or external systems on their behalf. Additionally, the vulnerability enables a reliable port-scanning technique by analyzing the server's response status codes and timing, helping the attacker infer whether ports are open or closed.

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Impact Analysis

This vulnerability can impact you by allowing an unauthenticated attacker to make the Homarr server send HTTP requests to arbitrary URLs. This can be exploited to scan internal network ports and services that are not normally accessible externally, potentially revealing sensitive information about your network infrastructure.

While the vulnerability does not directly allow data modification or denial of service, it can be used as a reconnaissance tool to gather information that could facilitate further attacks.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

To mitigate this vulnerability, upgrade Homarr to version 1.52.0 or later, where the issue has been fixed.

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