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CVE-2025-32013: SSRF Vulnerability in LNbits’ LNURL Authentication Handling Functionality

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Overview

This report discusses a significant Server Side Request Forgery (SSRF) vulnerability, identified as CVE-2025-32013, within the LNbits’ LNURL authentication handling functionality. This vulnerability poses a potential threat to system security and data confidentiality. It affects all entities utilizing LNbits, a popular Lightning wallet and accounts system. The vulnerability allows unauthorized access to internal network addresses, thereby compromising system data.

Vulnerability Summary

CVE ID: CVE-2025-32013
Severity: High (CVSS Score 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

LNbits | All versions prior to patched release

How the Exploit Works

The LNbits’ LNURL authentication handling functionality processes authentication requests without properly validating the callback URL. It accepts a callback URL parameter and makes an HTTP request to that URL using the httpx library. With redirect following enabled, an attacker can manipulate the callback URL to specify internal network addresses. This allows unauthorized access to internal resources, potentially leading to system compromise and data leakage.

Conceptual Example Code

Here is a hypothetical example of how the vulnerability might be exploited using a malicious HTTP request:

GET /lnurl-auth?callback=http://internal-network-resource HTTP/1.1
Host: vulnerable-lnbits-server

In this example, the attacker specifies an internal network resource as the callback URL. The LNbits server, failing to validate the URL, makes a request to this internal resource, potentially exposing sensitive information or functionality to the attacker.

Mitigation Guidance

To mitigate the potential impact of this vulnerability, users are advised to apply the vendor patch as soon as it becomes available. In the interim, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) may serve as a temporary mitigation strategy. These systems can help detect and prevent malicious requests exploiting this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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