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CVE-2021-21306 Explained : Impact and Mitigation

Discover the details of CVE-2021-21306, a Denial of Service vulnerability in Marked affecting versions >= 1.1.1 and < 2.0.0. Learn about the impact, technical aspects, and mitigation steps.

Marked, an open-source markdown parser and compiler (npm package "marked"), is vulnerable to a Denial of Service issue. The vulnerability exists in marked versions greater than or equal to 1.1.1 and less than 2.0.0. Attackers can exploit this flaw to perform Regular expression Denial of Service, affecting users who execute user-generated code through marked. The vulnerability has been patched in version 2.0.0.

Understanding CVE-2021-21306

This section delves deeper into the details of the vulnerability.

What is CVE-2021-21306?

CVE-2021-21306 is a Denial of Service vulnerability in the open-source markdown parser and compiler called Marked. It allows attackers to carry out Regular expression Denial of Service attacks by targeting instances running affected versions of marked.

The Impact of CVE-2021-21306

The impact of this vulnerability can result in a complete denial of service for users who process user input through marked, potentially leading to service unavailability.

Technical Details of CVE-2021-21306

Let's explore the technical aspects of the CVE in detail.

Vulnerability Description

The vulnerability in marked versions >= 1.1.1 and < 2.0.0 enables attackers to exploit Regular expression Denial of Service, affecting the availability of services.

Affected Systems and Versions

Systems running marked versions between 1.1.1 and 2.0.0 are susceptible to this vulnerability.

Exploitation Mechanism

Attackers can trigger the Denial of Service by executing specially crafted user-generated code through marked, exploiting the regex processing.

Mitigation and Prevention

Here are the measures to mitigate and prevent the exploitation of CVE-2021-21306.

Immediate Steps to Take

        Update marked to version 2.0.0 or higher to eliminate the vulnerability.
        Avoid running untrusted user-generated code through marked.

Long-Term Security Practices

        Regularly update software components to ensure the latest security patches are applied.
        Implement input validation mechanisms to prevent malicious payloads.

Patching and Updates

Keep track of security alerts and update mechanisms to promptly address any future vulnerabilities.

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