CVE-2018-20578 : Security Advisory and Response

A problem was found in NuttX prior to version 7.27 where the netlib_parsehttpurl() function mishandles URLs, leading to an Infinite Loop when URLs exceed the specified length. The vulnerability can be exploited through the Location header of an HTTP 3xx response.

Understanding CVE-2018-20578

This CVE identifies a vulnerability in NuttX versions prior to 7.27 that can result in an Infinite Loop due to mishandling of URLs.

What is CVE-2018-20578?

The netlib_parsehttpurl() function in NuttX prior to version 7.27 incorrectly processes URLs longer than the specified length, potentially causing an Infinite Loop. The issue arises from the mishandling of URLs exceeding the hostlen bytes limit.

The Impact of CVE-2018-20578

The vulnerability allows attackers to trigger an Infinite Loop by exploiting the Location header of an HTTP 3xx response, potentially leading to a denial of service.

Technical Details of CVE-2018-20578

This section delves into the technical aspects of the CVE.

Vulnerability Description

The netlib_parsehttpurl() function in NuttX versions before 7.27 fails to handle URLs exceeding the specified length, resulting in an Infinite Loop.

Affected Systems and Versions

Systems running NuttX versions prior to 7.27

Exploitation Mechanism

Attackers can exploit the vulnerability through the Location header of an HTTP 3xx response.

Mitigation and Prevention

Protecting systems from CVE-2018-20578 requires immediate action and long-term security measures.

Immediate Steps to Take

Update NuttX to version 7.27 or later to mitigate the vulnerability
Monitor and restrict network traffic to detect and prevent potential attacks

Long-Term Security Practices

Regularly update software and firmware to patch known vulnerabilities
Implement network security measures to prevent unauthorized access

Patching and Updates

Apply patches and updates provided by NuttX to address the vulnerability