CVE-2023-3348 : Security Advisory and Response

This CVE, assigned by Cloudflare, highlights a directory traversal vulnerability in the Cloudflare Wrangler command line tool.

Understanding CVE-2023-3348

This vulnerability affects the Wrangler command line tool versions 3.1.0 and below, as well as version 2.20.1 and below. It allows an attacker within the same network as the victim to access files outside of the directory for the development server.

What is CVE-2023-3348?

The CVE-2023-3348 vulnerability in Cloudflare Wrangler involves a directory traversal issue that occurs when running a local development server for Pages using the Wrangler command line tool.

The Impact of CVE-2023-3348

This vulnerability, identified as CAPEC-126 Path Traversal, can result in high confidentiality impact as it allows an attacker to access files outside of the intended directory, potentially exposing sensitive information to unauthorized users.

Technical Details of CVE-2023-3348

The vulnerability is categorized under CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'). It has a CVSS v3.1 base score of 5.7, with a medium severity level. The attack complexity is low, and user interaction is required for exploitation.

Vulnerability Description

The directory traversal vulnerability in Cloudflare Wrangler allows an attacker to connect to the victim's local development server and access files outside of the designated directory, compromising data confidentiality.

Affected Systems and Versions

Versions of the Wrangler command line tool up to 3.1.0 and 2.20.1 are affected by this vulnerability.

Exploitation Mechanism

An attacker in the same network as the victim can exploit this vulnerability by connecting to the local development server and manipulating file paths to access unauthorized directories.

Mitigation and Prevention

To address CVE-2023-3348 and prevent potential exploitation, it is crucial to take immediate steps and implement long-term security practices to safeguard systems.

Immediate Steps to Take

Upgrade to Wrangler version 3.1.1 or higher to mitigate the vulnerability. For Wrangler version 2, upgrade to version 2.20.1 or higher to ensure protection against directory traversal attacks.

Long-Term Security Practices

Implement network segmentation, regularly update software and tools, monitor network traffic for suspicious activities, and conduct thorough security assessments to maintain a robust defense against similar vulnerabilities.

Patching and Updates

Cloudflare has provided solutions to address the vulnerability. It is essential to promptly apply patches, updates, and security advisories released by Cloudflare to enhance the security posture of systems and prevent exploitation of the directory traversal flaw in Wrangler.