CVE-2021-20834 : Exploit Details and Defense Strategies

This article discusses a vulnerability in the Nike App for Android and iOS versions prior to 2.177 and 2.177.1. The vulnerability, identified as improper authorization in the handler for a custom URL scheme, can be exploited by a remote attacker to direct users to an arbitrary website through the affected app.

Understanding CVE-2021-20834

This section provides details on the nature and impact of CVE-2021-20834.

What is CVE-2021-20834?

The vulnerability CVE-2021-20834 pertains to improper authorization in the handler for a custom URL scheme in the Nike App for Android and iOS versions preceding 2.177 and 2.177.1. It enables a remote attacker to manipulate user actions and lead them to access unauthorized websites.

The Impact of CVE-2021-20834

The impact of this vulnerability is severe as it allows threat actors to exploit the app's functionality to direct users to malicious websites without their consent, posing risks to user privacy and security.

Technical Details of CVE-2021-20834

In this section, we delve into the technical aspects of CVE-2021-20834.

Vulnerability Description

The vulnerability arises from the improper handling of authorization requests for custom URL schemes within the Nike App for Android and iOS, granting attackers the ability to mislead users towards unauthorized websites.

Affected Systems and Versions

Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1 are affected by this exploit, leaving users of these versions vulnerable to unauthorized URL redirects.

Exploitation Mechanism

Attackers can leverage this vulnerability by crafting malicious URLs that exploit the improper authorization handling in the custom URL scheme of the Nike App, subsequently redirecting users to malicious websites.

Mitigation and Prevention

This section outlines steps to mitigate the risks posed by CVE-2021-20834.

Immediate Steps to Take

Users are advised to refrain from interacting with suspicious or untrusted links and promptly update their Nike App to the latest version to patch the vulnerability and prevent exploitation.

Long-Term Security Practices

To enhance security, users should exercise caution while accessing URLs through apps, stay informed about security patches, and avoid sharing sensitive information through vulnerable applications.

Patching and Updates

Nike, Inc. has released patches for the affected versions to address the vulnerability. Users must ensure their apps are updated regularly to mitigate security risks and safeguard their data.