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Difficulty: MediumCryptographic and Security Control Weaknesses

An internal penetration testing team discovers that a custom mobile application's source code explicitly disables Transport Layer Security (TLS) certificate validation routines. The application is configured to accept any presented digital certificate without verifying its certificate authority (CA) trust chain or hostname matching. Which of the following best describes the primary security risk introduced by this cryptographic control weakness?

  1. It enables unauthorized network nodes to perform Man-in-the-Middle (MitM) attacks by presenting arbitrary certificates to intercept traffic.Answer
  2. B
    It forces the application to fall back from high-speed symmetric encryption algorithms to slower asymmetric ciphers for bulk data transfer.
  3. C
    It compromises perimeter network boundaries by allowing external untrusted IP addresses to bypass ingress firewall filtering rules.
  4. D
    It exposes backend database servers to remote SQL injection attacks due to unvalidated user inputs in HTTP request headers.

Answer

It enables unauthorized network nodes to perform Man-in-the-Middle (MitM) attacks by presenting arbitrary certificates to intercept traffic.
Transport Layer Security (TLS) relies on digital certificate validation to establish server authenticity. When an application disables checks for hostname matching and trust chain validation, it accepts any digital certificate presented to it. An attacker on the network path can easily intercept connection attempts, substitute their own certificate, and execute a Man-in-the-Middle (MitM) attack to inspect or modify encrypted data in transit.

Step-by-Step Solution

1
Analyze the identified security vulnerability
The application code deliberately bypasses TLS certificate chain verification and hostname validation.
Understanding the function of TLS certificate validation is necessary to evaluate the attack surface.
2
Determine the impact of disabling certificate trust checks
Without validation, the application cannot confirm whether a server certificate was issued by a trusted Certificate Authority or belongs to the legitimate endpoint.
Improper certificate validation negates the authentication component of TLS.
3
Identify the threat vector enabled by this weakness
An attacker positioned on the communication path can present a self-signed or invalid certificate, which the client will accept, exposing encrypted traffic to decryption and manipulation (MitM).
Man-in-the-Middle attacks exploit client failure to validate identity credentials during cryptographic handshakes.

Key Concept

Improper Certificate Validation & Trust Weakness
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Topics

Cryptographic and Security Control Weaknesses

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