CVE-2021-0704 : Exploit Details and Defense Strategies

A vulnerability has been identified in the Android operating system that allows attackers to retrieve accounts from the device without proper permissions, resulting in potential local information disclosure.

Understanding CVE-2021-0704

This CVE identifies a permissions bypass vulnerability in createNoCredentialsPermissionNotification and related functions of AccountManagerService.java within the Android system.

What is CVE-2021-0704?

The vulnerability in AccountManagerService.java allows unauthorized retrieval of device accounts, leading to local information disclosure without requiring additional execution privileges or user interaction.

The Impact of CVE-2021-0704

The impact of this vulnerability is the potential exposure of sensitive information stored on the affected Android device, compromising user privacy and data confidentiality.

Technical Details of CVE-2021-0704

This section provides insights into the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The vulnerability in createNoCredentialsPermissionNotification of AccountManagerService.java enables malicious actors to access device accounts without the necessary permissions, leading to local information disclosure.

Affected Systems and Versions

The issue affects Android versions 9, 10, and 11, exposing devices running these operating systems to the permissions bypass vulnerability.

Exploitation Mechanism

By exploiting the permissions bypass in AccountManagerService.java, threat actors can retrieve accounts from the device without the required permissions, ultimately leading to the disclosure of sensitive information.

Mitigation and Prevention

To protect systems from CVE-2021-0704, immediate actions and long-term security practices are essential.

Immediate Steps to Take

Apply security patches provided by Android for the affected versions: Android-9, Android-10, and Android-11.
Monitor for any signs of unauthorized account access or information disclosure on devices.

Long-Term Security Practices

Regularly update Android devices with the latest security patches to mitigate known vulnerabilities.
Implement strong access controls and permissions management to prevent unauthorized access to sensitive information.

Patching and Updates

Stay informed about security bulletins and updates from Android to apply patches promptly and ensure the ongoing protection of devices.