louislam uptime-kuma 1.23.7/1.23.9 URL path traversal

Summaryinfo

A vulnerability categorized as critical has been discovered in louislam uptime-kuma. The affected element is an unknown function of the component URL Handler. Executing a manipulation can lead to path traversal. This vulnerability appears as CVE-2024-56331. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in louislam uptime-kuma. This vulnerability affects an unknown functionality of the component URL Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

Uptime Kuma is an open source, self-hosted monitoring tool. An **Improper URL Handling Vulnerability** allows an attacker to access sensitive local files on the server by exploiting the `file:///` protocol. This vulnerability is triggered via the **"real-browser"** request type, which takes a screenshot of the URL provided by the attacker. By supplying local file paths, such as `file:///etc/passwd`, an attacker can read sensitive data from the server. This vulnerability arises because the system does not properly validate or sanitize the user input for the URL field. Specifically: 1. The URL input (``) allows users to input arbitrary file paths, including those using the `file:///` protocol, without server-side validation. 2. The server then uses the user-provided URL to make a request, passing it to a browser instance that performs the "real-browser" request, which takes a screenshot of the content at the given URL. If a local file path is entered (e.g., `file:///etc/passwd`), the browser fetches and captures the file’s content. Since the user input is not validated, an attacker can manipulate the URL to request local files (e.g., `file:///etc/passwd`), and the system will capture a screenshot of the file's content, potentially exposing sensitive data. Any **authenticated user** who can submit a URL in "real-browser" mode is at risk of exposing sensitive data through screenshots of these files. This issue has been addressed in version 1.23.16 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

The advisory is shared for download at github.com. This vulnerability was named CVE-2024-56331 since 12/19/2024. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 1.23.16 eliminates this vulnerability. Applying the patch 6cfae01a0d3727c517afe512fc8fec1d99acf875 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• louislam

Name

• uptime-kuma

Version

• 1.23.7
• 1.23.9

License

• open-source

Website

• Product: https://github.com/louislam/uptime-kuma/

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