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CVE-2021-21384 : Exploit Details and Defense Strategies

Learn about CVE-2021-21384, a vulnerability in shescape before 1.1.3 allowing shell injection. Understand the impact, technical details, and mitigation steps for protection.

shescape is a simple shell escape package for JavaScript. In shescape before version 1.1.3, anyone using Shescape to defend against shell injection may still be vulnerable against shell injection if the attacker manages to insert a into the payload. The issue has been patched in version 1.1.3.

Understanding CVE-2021-21384

This vulnerability in shescape could potentially allow attackers to bypass shell injection protections.

What is CVE-2021-21384?

CVE-2021-21384 highlights a vulnerability in shescape where null characters are not properly escaped, leaving systems vulnerable to shell injection attacks.

The Impact of CVE-2021-21384

With a CVSS base score of 6.3 (Medium Severity), the vulnerability can lead to a compromise of system integrity if successfully exploited.

Technical Details of CVE-2021-21384

The technical details of the CVE include:

Vulnerability Description

The flaw enables attackers to execute arbitrary commands via shell injection due to the improper neutralization of argument delimiters.

Affected Systems and Versions

shescape versions prior to 1.1.3 are impacted by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited locally, with no privileges required, but user interaction is necessary for an attacker to trigger the exploit.

Mitigation and Prevention

To address CVE-2021-21384, consider the following:

Immediate Steps to Take

Users should update shescape to version 1.1.3 or later to mitigate the vulnerability. Additionally, ensure that no unusual or unexpected characters are present in the input.

Long-Term Security Practices

Implement secure coding practices to prevent injection attacks, sanitize user input, and regularly update dependencies to prevent future vulnerabilities.

Patching and Updates

Regularly check for security updates and patches from the vendor to stay protected from vulnerabilities like CVE-2021-21384.

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