CVE-2021-39682 : Vulnerability Insights and Analysis
Learn about CVE-2021-39682, a vulnerability in Android kernel allowing local privilege escalation without additional execution privileges. Find mitigation steps and updates here.
This CVE-2021-39682 article provides details about a potential out of bounds write vulnerability in Android kernel leading to local privilege escalation.
Understanding CVE-2021-39682
CVE-2021-39682 relates to a vulnerability in the Android kernel that could allow an attacker to gain escalated privileges without requiring additional execution permissions.
What is CVE-2021-39682?
An out of bounds write issue in mgm_alloc_page of memory_group_manager.c in the Android kernel may enable a local attacker to elevate privileges with no need for user interaction.
The Impact of CVE-2021-39682
This vulnerability could be exploited to locally escalate privileges without needing special execution rights, enhancing the risk of unauthorized access on affected systems.
Technical Details of CVE-2021-39682
The following points elaborate on the technical aspects of CVE-2021-39682:
Vulnerability Description
- Vulnerability Type: Elevation of privilege
- Description: Out of bounds write in mgm_alloc_page of memory_group_manager.c
Affected Systems and Versions
- Product Affected: Android
- Versions: Android kernel
Exploitation Mechanism
The incorrect bounds check in mgm_alloc_page could be exploited by an attacker to write out of bounds data, potentially leading to privilege escalation.
Mitigation and Prevention
Below are essential steps to address and prevent the exploitation of CVE-2021-39682:
Immediate Steps to Take
- Monitor security bulletins from the official Android source for patch releases.
- Apply relevant security updates promptly to mitigate the vulnerability.
Long-Term Security Practices
- Regularly update the Android kernel and associated components to safeguard against potential vulnerabilities.
- Implement access controls and least privilege principles to limit the impact of privilege escalation attacks.
Patching and Updates
- Stay informed about security announcements and CVE disclosures related to the Android platform.
- Perform regular security assessments and apply patches promptly to maintain system integrity and security.