Network Eavesdropping via Man-in-the-Middle on Internal Communications by | Oct 31, 2025 | Articles, Internal Pentesting Write ups

Reading Time: 5 Minutes

Introduction
While automated tools are useful for maintaining baseline security, they often miss sophisticated, multi-layered vulnerabilities that require a manual, strategic approach to uncover. At Black Hat Ethical Hacking (BHEH), our Red Team employs advanced manual testing, real-world attack simulations, and in-depth system analysis to uncover vulnerabilities that automated methods often overlook. This process highlights the importance of human expertise and creativity in identifying and exploiting complex weaknesses that could compromise even well-protected systems.
 

Executive Summary
An advanced network eavesdropping and sniffing attack was successfully performed against the organization’s internal network, demonstrating the ability to intercept and analyze unencrypted traffic. Over a two-day period, our team covertly captured large volumes of network data using tools like tcpdump, Wireshark, and Bettercap. This attack exposed sensitive information (including credentials and communications) due to a lack of encryption and insufficient network monitoring. The risk of such an attack is High, as it can compromise confidential data and reveal internal network topology without detection.
 
Overview of the Issue Discovered
Weakness Type
Reference: (CWE-319): Cleartext Transmission of Sensitive InformationWeakness Type: Lack of Network Encryption and Insufficient Traffic Monitoring
Severity
High: Network Eavesdropping and Man-in-the-Middle (MiTM) vulnerability allowing unauthorized interception and inspection of internal network communicati...