External risk intelligence

Spring Cloud Config Directory Traversal Vulnerability

CVE advisoryKnown Exploit

CVE-2020-5410

A directory traversal vulnerability in Spring Cloud Config Server allows attackers to access arbitrary configuration files, potentially exposing sensitive data. This impacts organizations using the affected component, posing a business risk due to unauthorized information disclosure. The vulnerability can be exploited

4Halo Surface Signal

Path Traversal

Vmware Spring Cloud Config

2.1.0 to before 2.1.92.2.0 to before 2.2.3

External exposure likelihood

Halo Surface Signal score for CVE-2020-5410

Spring Cloud Config Server is commonly deployed as an API service to provide configuration settings to microservices. While it often resides within an internal network, it is frequently accessible to various services and infrastructure components, and in some architectural patterns, it may be exposed at the edge or via gateways, making it reachable in many deployment environments.

Horizon Alert

Summary of the vulnerability and why it matters

Spring Cloud Config Server contains a flaw that permits unauthorized access to configuration files. This vulnerability can be exploited by sending a specially crafted request, potentially leading to a directory traversal attack. The exploitation of this vulnerability could expose sensitive configuration data.

  • Spring Cloud Config Server
  • Directory traversal flaw
  • Exposure of sensitive data

Attack Path

How an attacker could exploit the issue

Spring Cloud Config Server enables applications to expose arbitrary configuration files. An attacker can craft a specific URL to exploit a directory traversal vulnerability, allowing access to unintended configuration files. This could lead to the exposure of sensitive system information.

  • Publicly accessible endpoint.
  • Unauthenticated request with crafted URL.
  • Directory traversal leads to file disclosure.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Spring Cloud Config could allow an attacker to access arbitrary configuration files. The exploitation does not require advanced technical skills and can be performed remotely. The impact includes unauthorized access to sensitive information within configuration files, posing a significant risk to the affected organization.

  • Attackers with low skill.
  • No authentication required.
  • High business risk.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability allows unauthorized access to arbitrary configuration files via a specially crafted URL. Attackers can exploit this to read sensitive information that could facilitate further compromise. The affected component is the Spring Cloud Config Server module.

  • Identify exposed Spring Cloud Config assets.
  • Restrict access to affected systems.
  • Apply vendor updates and validate.
  • Monitor for related security events.

Frequently asked questions

What is Spring Cloud Config and its purpose in microservices architecture?

Spring Cloud Config is a Spring module that provides server and client components for externalized configuration of applications in distributed systems. It centralizes configuration management, enabling easier updates without redeploying microservices.

How does CVE-2020-5410, a directory traversal vulnerability, function?

CVE-2020-5410 is a directory traversal vulnerability (CWE-23) in Spring Cloud Config Server. Attackers can exploit it by sending a specially crafted URL to access arbitrary configuration files from the server's filesystem, potentially revealing sensitive information.

What is required for an attacker to trigger the CVE-2020-5410 vulnerability?

An attacker can exploit this vulnerability by sending a request with a specifically designed URL to the Spring Cloud Config Server, which can lead to a directory traversal attack and disclosure of configuration files.

What is the relevance of the CVE-2020-5410 vulnerability to security advisories?

This vulnerability is significant because it allows attackers to access arbitrary configuration files, potentially exposing sensitive data. It can be exploited remotely without requiring advanced skills, posing a considerable risk.

What are the recommended steps to address the Spring Cloud Config Server vulnerability?

To mitigate this vulnerability, organizations should identify exposed Spring Cloud Config assets, restrict access to affected systems, apply vendor-provided updates, and monitor for related security events.

References