Cloud Defense Logo

Products

Solutions

Company

Book A Live Demo

CVE-2021-21305 : What You Need to Know

Learn about CVE-2021-21305, a code injection vulnerability in CarrierWave versions prior to 1.3.2 and 2.1.1, allowing attackers to execute Ruby code, potentially leading to remote code execution. Find out the impact, affected systems, and mitigation steps.

CarrierWave, an open-source RubyGem, is susceptible to a code injection vulnerability in versions prior to 1.3.2 and 2.1.1. The vulnerability arises from the inappropriate evaluation of the content of the mutation option(:read/:write), enabling attackers to execute arbitrary Ruby code. This could potentially lead to remote code execution (RCE). The issue has been addressed in versions 1.3.2 and 2.1.1.

Understanding CVE-2021-21305

CarrierWave is a RubyGem used for file uploading in Ruby applications. The vulnerability in versions before 1.3.2 and 2.1.1 allows for code injection through improper evaluation of input content.

What is CVE-2021-21305?

CVE-2021-21305 is a code injection vulnerability in CarrierWave versions prior to 1.3.2 and 2.1.1. Attackers can exploit this vulnerability to execute malicious Ruby code, potentially leading to remote code execution.

The Impact of CVE-2021-21305

The impact of CVE-2021-21305 is rated as HIGH based on the CVSS v3.1 score of 7.4. The vulnerability has a low attack complexity and requires no user interaction, posing a significant risk of remote code execution.

Technical Details of CVE-2021-21305

The vulnerability allows attackers to craft a string that can be executed as Ruby code, leading to potential remote code execution.

Vulnerability Description

In CarrierWave versions before 1.3.2 and 2.1.1, the "#manipulate!" method inappropriately evaluates the content of the mutation option, enabling code injection.

Affected Systems and Versions

        Products: CarrierWave
        Vendor: carrierwaveuploader
        Affected Versions: < 1.3.2, >= 2.0.0, < 2.1.1

Exploitation Mechanism

Attackers can exploit this vulnerability by supplying untrusted inputs to the option, allowing the execution of crafted Ruby code.

Mitigation and Prevention

To mitigate the risk associated with CVE-2021-21305, users should take immediate actions and adopt long-term security practices.

Immediate Steps to Take

        Upgrade CarrierWave to versions 1.3.2 or 2.1.1 to address the vulnerability.

Long-Term Security Practices

        Sanitize and validate user inputs to prevent code injection attacks.

Patching and Updates

        Regularly update and patch software components to ensure the latest security fixes are applied.

Popular CVEs

CVE Id

Published Date

Is your System Free of Underlying Vulnerabilities?
Find Out Now