CVE-2021-43138 : Security Advisory and Response

CVE-2021-43138 is a vulnerability identified in Async before 2.6.4 and 3.x before 3.2.2 that allows a malicious user to escalate privileges through the mapValues() method, leading to prototype pollution in lib/internal/iterator.js.

Understanding CVE-2021-43138

What is CVE-2021-43138?

This CVE pertains to a security issue in the Async library versions mentioned, enabling an attacker to gain unauthorized privileges utilizing the mapValues() method, resulting in prototype pollution.

The Impact of CVE-2021-43138

The vulnerability can be exploited by a malicious user to manipulate object properties and potentially compromise the integrity and security of applications that utilize Async.

Technical Details of CVE-2021-43138

Vulnerability Description

The issue arises due to improper input validation in the mapValues() method, allowing an attacker to inject and modify prototype properties.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All versions of Async before 2.6.4 and 3.x before 3.2.2 are affected.

Exploitation Mechanism

The attacker can exploit this vulnerability by passing crafted data to the mapValues() method, leading to the pollution of object prototypes and potentially granting unauthorized privileges.

Mitigation and Prevention

Immediate Steps to Take

Update Async to version 2.6.4 or 3.2.2, which contain patches addressing the vulnerability.
Monitor for any unusual activity indicating exploitation of the vulnerability.

Long-Term Security Practices

Implement input validation mechanisms to prevent malicious data injection.
Regularly review and update libraries to ensure using the latest secure versions.

Patching and Updates

It is crucial to promptly apply updates and patches provided by Async to mitigate the risk associated with CVE-2021-43138 vulnerability.