CVE-2021-39639 : Exploit Details and Defense Strategies
Get insights into CVE-2021-39639, an Android kernel vulnerability leading to unauthorized privilege escalation without user interaction. Learn mitigation steps.
This article provides details about CVE-2021-39639, a vulnerability in Android affecting the Android kernel.
Understanding CVE-2021-39639
CVE-2021-39639 is classified as an elevation of privilege vulnerability in the Android kernel.
What is CVE-2021-39639?
In fvp.c of Android, a glitch in CPU behavior without a permission check can allow local escalation of privilege, requiring physical access to device internals with no additional execution privileges.
The Impact of CVE-2021-39639
The vulnerability could be exploited without user interaction, potentially leading to unauthorized privilege escalation.
Technical Details of CVE-2021-39639
The technical aspects of the vulnerability include:
Vulnerability Description
- Location: fvp.c in Android
- Issue: Glitch in CPU behavior without permission check
- Consequence: Local escalation of privilege
Affected Systems and Versions
- Product: Android
- Versions: Android kernel
Exploitation Mechanism
- Requires physical access to device internals
- No additional execution privileges needed
Mitigation and Prevention
Actions to mitigate the risk of CVE-2021-39639:
Immediate Steps to Take
- Monitor vendor security bulletins for patches
- Restrict physical access to devices
Long-Term Security Practices
- Implement SELinux for stricter access controls
- Conduct regular security audits and assessments
Patching and Updates
- Apply security patches promptly
- Keep systems up to date with the latest firmware