CVE-2024-21668 : Security Advisory and Response

This CVE, assigned on January 9, 2024, focuses on the insertion of sensitive information into the log file in the "react-native-mmkv" library.

Understanding CVE-2024-21668

This vulnerability, identified as CWE-532, involves the insertion of sensitive information into log files in the "react-native-mmkv" library, exposing confidential data to potential unauthorized access.

What is CVE-2024-21668?

The "react-native-mmkv" library is designed to facilitate the use of MMKV within React Native applications. Prior to version 2.11.0, a critical flaw existed where the library inadvertently logged the optional encryption key for the MMKV database into the Android system log. This key could be easily acquired by individuals with access to the Android Debugging Bridge (ADB), compromising the confidentiality of the data. It's important to note that this vulnerability does not affect iOS devices. The exposure of the encryption secret in system logs poses a significant risk as attackers could exploit it by enabling ADB and subverting an app's security measures. However, this vulnerability has been addressed in version 2.11.0.

The Impact of CVE-2024-21668

The CVSS v3.1 base score for this vulnerability is 4.4, categorizing it as having a medium severity level. The attack complexity is low, requiring high privileges to exploit the vulnerability. While integrity impact is none and availability impact is also none, the confidentiality impact is assessed as high.

Technical Details of CVE-2024-21668

This section delves into specific technical aspects related to the CVE-2024-21668 vulnerability.

Vulnerability Description

The vulnerability in the "react-native-mmkv" library allowed the accidental logging of the encryption key for the MMKV database into the Android system log prior to version 2.11.0. This flaw potentially exposed sensitive information to unauthorized users, compromising the security of the affected applications.

Affected Systems and Versions

The vulnerability impacts versions of the "react-native-mmkv" library prior to version 2.11.0. Users utilizing affected versions are at risk of having the encryption key inadvertently exposed, leading to potential breaches of confidentiality on Android devices.

Exploitation Mechanism

By logging the encryption key into the system logs, attackers with access to ADB could easily retrieve the key, circumventing the security measures implemented by applications using the vulnerable library. This exploit could lead to the unauthorized access of sensitive data stored within the MMKV database.

Mitigation and Prevention

To address and prevent the CVE-2024-21668 vulnerability, the following steps are recommended:

Immediate Steps to Take

Upgrade to version 2.11.0 or above of the "react-native-mmkv" library to ensure that the encryption key logging issue is resolved.
Avoid enabling the Android Debugging Bridge (ADB) on devices that may have access to sensitive information stored using the library.
Implement additional security measures within applications to safeguard encryption keys and sensitive data from unauthorized access.

Long-Term Security Practices

Regularly update software components and libraries to the latest versions to mitigate potential vulnerabilities.
Conduct security assessments and audits within applications to identify and address any existing security weaknesses.
Educate developers and users on secure coding practices and data protection measures to enhance overall security posture.

Patching and Updates

Stay informed about security advisories and updates released by the "react-native-mmkv" library maintainers to promptly apply patches addressing known vulnerabilities.
Monitor for any new vulnerabilities or security issues related to the library and take appropriate actions to secure your applications and data.