CVE-2020-0433 : Security Advisory and Response

Android kernel vulnerability leading to local privilege escalation.

Understanding CVE-2020-0433

This CVE details a vulnerability in the Android kernel that could allow attackers to escalate privileges locally without needing additional execution privileges. The issue arises from improper locking mechanisms.

What is CVE-2020-0433?

In blk_mq_queue_tag_busy_iter of blk-mq-tag.c, a use-after-free vulnerability exists due to improper locking. This flaw can be exploited for local privilege escalation without requiring user interaction.

The Impact of CVE-2020-0433

The vulnerability could potentially allow a local attacker to gain escalated privileges on the affected Android devices, impacting confidentiality, integrity, and availability.

Technical Details of CVE-2020-0433

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability stems from inadequate locking in blk_mq_queue_tag_busy_iter of blk-mq-tag.c, leading to a use-after-free condition.

Affected Systems and Versions

Affected Product: Android
Affected Version: Android kernel

Exploitation Mechanism

The vulnerability can be exploited by malicious actors to achieve local privilege escalation without the need for additional execution privileges.

Mitigation and Prevention

Actions to secure systems against CVE-2020-0433.

Immediate Steps to Take

Apply security patches promptly to fix the vulnerability.
Monitor for any unusual system behavior indicating exploitation.

Long-Term Security Practices

Regularly update all software and firmware to ensure robust security measures.
Implement the principle of least privilege to restrict user access.

Patching and Updates

Regularly check for and apply security updates from the vendor to mitigate known vulnerabilities.