CVE-2021-3918 : Security Advisory and Response

The article provides details about CVE-2021-3918, a vulnerability in json-schema leading to Prototype Pollution. It covers the impact, technical details, and mitigation steps.

Understanding CVE-2021-3918

This section dives into the specifics of CVE-2021-3918, shedding light on its implications and severity.

What is CVE-2021-3918?

The vulnerability in json-schema allows for 'Prototype Pollution,' potentially leading to unauthorized modifications of object prototype attributes.

The Impact of CVE-2021-3918

With a CVSS base score of 9.8 (Critical), this vulnerability can be exploited over a network without requiring privileges, posing a high risk to confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-3918

Delve into the technical aspects of CVE-2021-3918, understanding its nature and how it affects systems.

Vulnerability Description

CVE-2021-3918 is categorized under CWE-1321, involving the improper control of object prototype attributes in json-schema, leaving systems vulnerable to unauthorized modifications.

Affected Systems and Versions

The vulnerability impacts kriszyp/json-schema versions up to 0.3.0, exposing systems using these versions to the risk of Prototype Pollution.

Exploitation Mechanism

The vulnerability can be exploited remotely over a network without the need for user interaction, making it a prime target for threat actors aiming to compromise systems.

Mitigation and Prevention

Discover the necessary steps to mitigate and prevent the exploitation of CVE-2021-3918, safeguarding systems from potential attacks.

Immediate Steps to Take

Users are advised to update the json-schema library to a patched version beyond 0.3.0 to eliminate the vulnerability and enhance system security.

Long-Term Security Practices

Implementing secure coding practices such as input validation and output encoding can help prevent similar vulnerabilities and enhance overall system security.

Patching and Updates

Regularly monitor for security updates and apply patches promptly to address known vulnerabilities like CVE-2021-3918, ensuring the ongoing protection of systems.