CVE-2018-7159 : Exploit Details and Defense Strategies

In March 2018, a security vulnerability was identified in Node.js affecting versions 4.x, 6.x, 8.x, and 9.x. The flaw in the HTTP parser allowed spaces in the

Content-Length

header, contrary to the HTTP specification. Although the risk was assessed as very low, it could impact user-code assumptions.

Understanding CVE-2018-7159

This CVE pertains to a misinterpretation of input in the HTTP parser of Node.js.

What is CVE-2018-7159?

The vulnerability in Node.js allowed spaces in the

Content-Length

header, potentially leading to incorrect data interpretation. The flaw was addressed in subsequent updates.

The Impact of CVE-2018-7159

The security risk posed by this vulnerability was considered very low, as exploiting it beyond providing incorrect

Content-Length

values was challenging. However, user-code vulnerabilities due to inaccurate assumptions could exist.

Technical Details of CVE-2018-7159

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The HTTP parser in affected Node.js versions misinterpreted spaces in the

Content-Length

header, deviating from the HTTP specification.

Affected Systems and Versions

Product: Node.js
Vendor: The Node.js Project
Versions: 4.x, 6.x, 8.x, 9.x

Exploitation Mechanism

Exploiting this flaw beyond providing incorrect

Content-Length

values was deemed challenging.
User-code vulnerabilities could arise from incorrect assumptions about data accuracy.

Mitigation and Prevention

Protective measures and steps to address CVE-2018-7159.

Immediate Steps to Take

Update Node.js to the latest patched version.
Review and validate input data to ensure accuracy.

Long-Term Security Practices

Regularly audit and review code for potential vulnerabilities.
Educate developers on secure coding practices.

Patching and Updates

Apply all security patches and updates released by Node.js.