CVE-2017-5946 Explained : Impact and Mitigation

A security vulnerability in the Zip::File component of the rubyzip gem version earlier than 1.2.1 for Ruby allows attackers to perform directory traversal, potentially leading to arbitrary file writing on the system's filesystem.

Understanding CVE-2017-5946

This CVE involves a directory traversal vulnerability in the rubyzip gem, enabling attackers to exploit systems that allow the uploading of .zip files.

What is CVE-2017-5946?

The vulnerability in the Zip::File component of rubyzip gem versions prior to 1.2.1 allows attackers to upload malicious files containing pathname substrings like "../", facilitating unauthorized file writing on the system.

The Impact of CVE-2017-5946

The security flaw permits attackers to write arbitrary files to the system's filesystem by exploiting directory traversal, potentially leading to unauthorized access and data manipulation.

Technical Details of CVE-2017-5946

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The Zip::File component in the rubyzip gem before version 1.2.1 for Ruby is susceptible to a directory traversal vulnerability, enabling attackers to write unauthorized files to the filesystem.

Affected Systems and Versions

Affected Component: Zip::File in rubyzip gem
Vulnerable Versions: Earlier than 1.2.1

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading specially crafted .zip files containing malicious pathname substrings like "../", allowing them to traverse directories and write arbitrary files.

Mitigation and Prevention

Protecting systems from CVE-2017-5946 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the rubyzip gem to version 1.2.1 or later to mitigate the vulnerability.
Avoid allowing the uploading of .zip files until the gem is patched.

Long-Term Security Practices

Implement input validation mechanisms to prevent directory traversal attacks.
Regularly monitor and audit file uploads for suspicious activities.

Patching and Updates

Apply patches and updates provided by the rubyzip gem maintainers to address the vulnerability.