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CVE-2024-56331— Local File Inclusion (LFI) via Improper URL Handling in uptime-kuma's `Real-Browser` monitor

Quick assessment

Affected
louislam uptime-kuma
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Uptime Kuma是Louis Lam个人开发者的一个易于使用的自托管监控工具。 Uptime Kuma 1.23.0至1.23.15版本和2.0.0-beta.0版本存在路径遍历漏洞，该漏洞源于源于对real-browser请求类型中的URL字段缺少服务器端验证和清理，导致攻击者可以访问服务器上的敏感本地文件。

CVSS 6.8 · Medium EPSS 1.83% · P78

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2024-56331

Vulnerability Information
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Vulnerability Title
Local File Inclusion (LFI) via Improper URL Handling in uptime-kuma's `Real-Browser` monitor
Source: CVE Program / CVE List V5
Vulnerability Description
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 (`<input data-v-5f5c86d7="" id="url" type="url" class="form-control" pattern="https?://.+" required="">`) 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Uptime Kuma 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Uptime Kuma是Louis Lam个人开发者的一个易于使用的自托管监控工具。 Uptime Kuma 1.23.0至1.23.15版本和2.0.0-beta.0版本存在路径遍历漏洞，该漏洞源于源于对real-browser请求类型中的URL字段缺少服务器端验证和清理，导致攻击者可以访问服务器上的敏感本地文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
louislam uptime-kuma >= 1.23.0, < 1.23.16 -

II. Public POCs for CVE-2024-56331

# POC Description Source Link Shenlong Link
1 None https://github.com/griisemine/CVE-2024-56331 POC Details
2 Uptime Kuma has an Improper URL Handling vulnerability that can be exploited through the "real-browser" feature. By providing a URL using the file:/// protocol (e.g., file:///etc/passwd), an attacker can obtain a screenshot of local sensitive files, because the user input is not validated by the server. https://github.com/projectdiscovery/nuclei-templates/blob/main/code/cves/2024/CVE-2024-56331.yaml POC Details
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III. Intelligence Information for CVE-2024-56331

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Patches & Fixes for CVE-2024-56331 (1)

Vendor Advisories for CVE-2024-56331 (1)

IV. Related Vulnerabilities

Same product: uptime-kuma
Same vendor: louislam
Same weakness: CWE-22

V. Comments for CVE-2024-56331

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