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medium advisory

nginx-ui Information Disclosure Vulnerability

A remote, authenticated attacker can exploit a vulnerability in nginx-ui to disclose sensitive information.

nginx-ui is a web interface for managing Nginx web servers. A vulnerability exists within nginx-ui that allows a remote, authenticated attacker to potentially disclose sensitive information. This vulnerability could be exploited by an attacker who has already gained valid credentials to the nginx-ui web interface. The exact nature of the information disclosed is not specified in the source material. This vulnerability matters to defenders because it could lead to the exposure of configuration details, API keys, or other sensitive data that could be used for further attacks.

Attack Chain

  1. Attacker gains valid credentials to the nginx-ui web interface through credential stuffing, phishing, or other means.
  2. Attacker logs into the nginx-ui web interface.
  3. Attacker crafts a malicious HTTP request to a specific endpoint within the nginx-ui application.
  4. The vulnerable endpoint processes the request without proper sanitization or access controls.
  5. Sensitive information, such as configuration files or API keys, is inadvertently exposed in the response.
  6. Attacker captures the response and extracts the disclosed information.
  7. Attacker uses the disclosed information to further compromise the Nginx server or related systems.

Impact

Successful exploitation of this vulnerability could lead to the disclosure of sensitive information, such as Nginx configuration files, API keys, or other credentials. This information could then be used by the attacker to gain unauthorized access to the Nginx server, modify its configuration, or access other internal systems. The impact depends on the nature and sensitivity of the disclosed information.

Recommendation

  • Monitor web server logs for suspicious activity, specifically unusual requests to nginx-ui endpoints (see example Sigma rule below).
  • Implement strong authentication and authorization mechanisms for nginx-ui, including multi-factor authentication.
  • Review the nginx-ui application code for potential information disclosure vulnerabilities, focusing on areas where sensitive data is handled.

Detection coverage 2

Detect Suspicious Access to nginx-ui Endpoints

low

Detects suspicious GET requests to nginx-ui endpoints that may indicate information disclosure attempts.

sigma tactics: discovery techniques: T1592 sources: webserver

Detect POST Requests to nginx-ui Configuration Endpoints

medium

Detects POST requests to nginx-ui endpoints, which might indicate unauthorized configuration changes or information disclosure attempts.

sigma tactics: discovery techniques: T1592 sources: webserver

Detection queries are available on the platform. Get full rules →