CVE-2021-40894 : Exploit Details and Defense Strategies

This article provides insights into a Regular Expression Denial of Service (ReDOS) vulnerability found in underscore-99xp v1.7.2.

Understanding CVE-2021-40894

This section will explain the details of the CVE-2021-40894 vulnerability.

What is CVE-2021-40894?

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in underscore-99xp v1.7.2 when the deepValueSearch function is called.

The Impact of CVE-2021-40894

The vulnerability could potentially lead to a denial of service attack on systems that utilize the underscore-99xp v1.7.2 library.

Technical Details of CVE-2021-40894

In this section, we will delve into the technical aspects of CVE-2021-40894.

Vulnerability Description

The vulnerability exists in the deepValueSearch function of underscore-99xp v1.7.2, allowing for ReDOS attacks.

Affected Systems and Versions

Affected Product: n/a
Affected Vendor: n/a
Affected Version: v1.7.2

Exploitation Mechanism

The vulnerability can be exploited by triggering the deepValueSearch function in underscore-99xp v1.7.2 to cause a ReDOS attack.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-40894.

Immediate Steps to Take

Update the underscore-99xp library to a non-vulnerable version if available.
Implement input validation in applications using underscore-99xp to prevent malicious input.
Monitor for abnormal CPU usage that might indicate a ReDOS attack.

Long-Term Security Practices

Regularly update and patch dependencies to avoid known vulnerabilities.
Educate developers on secure coding practices to prevent ReDOS and other types of attacks.

Patching and Updates

Ensure timely patching of the underlying library and conduct thorough testing to verify the elimination of the vulnerability.