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CVE-2023-49564: Authentication Bypass Vulnerability in CBIS/NCS Manager API

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Overview

In this blog post, we delve into the details of a critical security vulnerability, CVE-2023-49564, that affects the CBIS/NCS Manager API. This flaw exposes the application to potential unauthorized access, system compromise, and data leakage. The vulnerability is particularly concerning as it lies within a crucial component of the CBIS/NCS Manager – the Nginx Podman container, which is responsible for API management. The potential for system compromise and the high CVSS score of 8.8 underline the urgency of addressing this threat promptly.

Vulnerability Summary

CVE ID: CVE-2023-49564
Severity: High (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized access to API functions, potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

CBIS/NCS Manager API | All versions prior to patch

How the Exploit Works

The CVE-2023-49564 vulnerability arises due to a weak verification mechanism in the authentication implementation of the Nginx Podman container on the CBIS/NCS Manager host machine. This flaw allows an unauthenticated user to bypass the authentication process by sending a specially crafted HTTP header. As a result, the attacker can gain unauthorized access to restricted or sensitive endpoints of the HTTP API without providing valid credentials.

Conceptual Example Code

The following is a conceptual example of an HTTP request that exploits the vulnerability:

GET /restricted/endpoint HTTP/1.1
Host: target.example.com
X-Auth-Bypass: true

In this example, the attacker sends a GET request to a restricted endpoint with a specially crafted `X-Auth-Bypass` header set to `true`. The weak verification mechanism present in the API fails to validate this header properly, allowing the attacker to bypass the authentication process and access restricted or sensitive endpoints.

Recommendations for Mitigation

The recommended mitigation for this vulnerability is to apply the vendor patch as soon as it becomes available. In the interim, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to partially mitigate the vulnerability by blocking or alerting on suspicious activity. Additionally, restricting access to the management network using an external firewall can also help reduce the risk of exploitation.

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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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