Integer Underflow in Ettercap Leading to Stack Buffer Overflow

Executive Summary

Ettercap through version 0.8.4.1 has an integer underflow vulnerability in the ccmp_decrypt() function. This flaw occurs when the function subtracts an 8-byte CCMP trailer without verifying the minimum packet length. Attackers on a network with the WPA key loaded can send a specially crafted short CCMP frame. This triggers a stack buffer overflow in the Ettercap process, which typically runs with root privileges.

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Detection Guidance

Detecting this vulnerability requires monitoring Ettercap processes and network traffic for unusual activity. Check for Ettercap running as root with suspicious network frames. Use commands like 'ps aux | grep ettercap' to find Ettercap processes and 'tcpdump -i <interface> -c 100 -nn' to capture short frames that may trigger the overflow.

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Impact Analysis

An attacker could exploit this to execute arbitrary code on your system with root privileges. This could allow full control over the affected machine, enabling data theft, network monitoring, or further attacks within your network. Systems running Ettercap, especially in security-sensitive environments, are at high risk.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. Organizations may face compliance violations, legal penalties, and reputational damage if exploited.

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Mitigation Strategies

Immediately update Ettercap to the latest version beyond 0.8.4.1. Disable Ettercap if not needed. Restrict network access to Ettercap processes and monitor for unexpected root-level activity. Apply network segmentation to limit exposure.

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