CVE-2021-0383 : Security Advisory and Response

Android's CaptivePortalLoginActivity.java in Android-11 has a vulnerability that could allow a local attacker to escalate privileges without additional execution privileges. This CVE highlights an elevation of privilege issue in carrier settings.

Understanding CVE-2021-0383

This CVE refers to a confused deputy vulnerability in Android's CaptivePortalLoginActivity.java, affecting Android-11.

What is CVE-2021-0383?

CVE-2021-0383 is an elevation of privilege vulnerability in Android's CaptivePortalLoginActivity.java, allowing local attackers to escalate privileges without user interaction.

The Impact of CVE-2021-0383

The vulnerability poses a risk of local escalation of privilege in carrier settings, potentially leading to unauthorized access to sensitive information without the need for additional execution privileges.

Technical Details of CVE-2021-0383

The technical details of CVE-2021-0383 include:

Vulnerability Description

The vulnerability arises from a confused deputy scenario in CaptivePortalLoginActivity.java, undermining the security of Android-11 carrier settings.

Affected Systems and Versions

The affected system is Android running on version Android-11.

Exploitation Mechanism

Exploiting this vulnerability does not require user interaction, making it easier for local attackers to escalate privileges.

Mitigation and Prevention

To address CVE-2021-0383, consider the following:

Immediate Steps to Take

Implement a security patch provided by Android to mitigate the elevation of privilege risk in CaptivePortalLoginActivity.java.

Long-Term Security Practices

Ensure timely updates and security patches are applied to Android devices to prevent exploitation of known vulnerabilities.

Patching and Updates

Regularly check for security bulletins and updates from Android to stay protected against emerging threats and vulnerabilities.