CVE-2020-0421 Explained : Impact and Mitigation

Android out of bounds write vulnerability allows local privilege escalation without user interaction.

Understanding CVE-2020-0421

In the appendFormatV function of String8.cpp in Android, a flaw exists that could lead to a local privilege escalation exploit.

What is CVE-2020-0421?

This vulnerability arises from incorrect error handling, potentially resulting in an out of bounds write. The exploit could lead to local escalation of privilege without requiring additional execution privileges or user interaction.

The Impact of CVE-2020-0421

The CVE-2020-0421 vulnerability, classified as an elevation of privilege issue, affects various versions of the Android operating system, posing a risk of unauthorized escalation of user privileges.

Technical Details of CVE-2020-0421

Vulnerability Description

The vulnerability in appendFormatV of String8.cpp may allow an attacker to write beyond the allocated memory space, potentially leading to unauthorized privilege escalation.

Affected Systems and Versions

Affected Product: Android
Affected Versions: Android-8.1, Android-9, Android-10, Android-11, Android-8.0

Exploitation Mechanism

Attackers can exploit this vulnerability locally without the need for user interaction or additional execution permissions.

Mitigation and Prevention

Immediate Steps to Take

Apply security updates from the official Android Security Bulletin to address the vulnerability.
Monitor vendor security advisories for patches and guidance on securing affected systems.
Restrict access to the vulnerable system to trusted users only.

Long-Term Security Practices

Implement regular security training for users and administrators to raise awareness about safe computing practices.
Conduct periodic security assessments and penetration testing to identify and address potential vulnerabilities.

Patching and Updates

Proactively apply patches and updates provided by Android to ensure the timely mitigation of security vulnerabilities.