CVE-2021-3689 : Exploit Details and Defense Strategies

yii2 is vulnerable to a 'Use of Predictable Algorithm in Random Number Generator' security issue. This CVE has a CVSS base score of 8.1, indicating a high severity vulnerability that could impact confidentiality, integrity, and availability of the system.

Understanding CVE-2021-3689

This section will delve into what CVE-2021-3689 is and its impact on systems.

What is CVE-2021-3689?

The vulnerability in yiisoft/yii2 relates to the use of a predictable algorithm in the random number generator, posing a security risk to affected systems.

The Impact of CVE-2021-3689

With a CVSS base score of 8.1, this vulnerability has high severity implications. It could lead to exploitation by threat actors resulting in compromised confidentiality, integrity, and availability of the system.

Technical Details of CVE-2021-3689

In this section, we will discuss the specifics of the vulnerability, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerability arises from the use of a predictable algorithm in the random number generator within yiisoft/yii2, making it susceptible to attacks.

Affected Systems and Versions

The issue affects versions of yiisoft/yii2 up to and including 2.0.42.1, with the specified version being custom.

Exploitation Mechanism

Threat actors can exploit this vulnerability over a network without requiring any user interaction, highlighting the criticality of the issue.

Mitigation and Prevention

This section provides guidance on mitigating the risks associated with CVE-2021-3689 and implementing preventative measures.

Immediate Steps to Take

Users are advised to apply patches promptly, update yiisoft/yii2 to a secure version, and monitor for any unauthorized access or unusual activities.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security assessments, and staying informed about potential vulnerabilities can enhance long-term security.

Patching and Updates

Stay informed about security updates released by yiisoft and promptly apply patches to eliminate the vulnerability.