CVE-2021-39734 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2021-39734, a vulnerability impacting Android's OneToOneChatImpl.java that allows local privilege escalation without requiring additional execution privileges.

Understanding CVE-2021-39734

CVE-2021-39734 is an elevation of privilege vulnerability affecting Android's OneToOneChatImpl.java, leading to local privilege escalation without user interaction.

What is CVE-2021-39734?

Identified in OneToOneChatImpl.java of Android, allowing the sending of RCS messages without proper permissions.
Allows for local privilege escalation without the need for extra execution privileges.

The Impact of CVE-2021-39734

Possibility of local privilege escalation without the requirement of additional execution privileges.

Technical Details of CVE-2021-39734

This section delves into specific technical aspects of the vulnerability.

Vulnerability Description

sendMessage in OneToOneChatImpl.java permits sending RCS messages without necessary permissions, enabling local privilege escalation.

Affected Systems and Versions

Product: Android
Versions: Android kernel

Exploitation Mechanism

Lack of permission check in sendMessage of OneToOneChatImpl.java allows unauthorized sending of RCS messages, leading to local privilege escalation.

Mitigation and Prevention

Learn how to mitigate the impact of CVE-2021-39734.

Immediate Steps to Take

Implement necessary permission checks in OneToOneChatImpl.java to prevent unauthorized message sending.
Regularly monitor for unauthorized activities related to RCS messaging.

Long-Term Security Practices

Conduct regular security audits to identify and address potential vulnerabilities.
Keep software and systems up to date to prevent exploitation of known vulnerabilities.

Patching and Updates

Apply patches and updates provided by Android to address the CVE-2021-39734 vulnerability.