CVE-2021-39802 : Vulnerability Insights and Analysis
Learn about CVE-2021-39802, a security flaw in Android allowing local privilege escalation. Discover impact, affected systems, and mitigation steps.
This CVE-2021-39802 article provides details on a vulnerability in Android that could lead to local privilege escalation without requiring additional execution privileges.
Understanding CVE-2021-39802
This section will explain the nature of the CVE-2021-39802 vulnerability in Android.
What is CVE-2021-39802?
CVE-2021-39802 is a vulnerability found in the change_pte_range function of mprotect.c in Android, which allows for a permissions bypass leading to the potential escalation of local privilege without the need for further execution privileges.
The Impact of CVE-2021-39802
The CVE-2021-39802 vulnerability can result in local privilege escalation in Android systems without the requirement of additional execution privileges.
Technical Details of CVE-2021-39802
This section covers specific technical aspects of the CVE-2021-39802 vulnerability.
Vulnerability Description
The vulnerability in change_pte_range of mprotect.c allows for making a shared mmap writable through a permissions bypass, facilitating local privilege escalation.
Affected Systems and Versions
- Affected Product: Android
- Affected Version: Android kernel
Exploitation Mechanism
The vulnerability arises due to a permissions bypass in the change_pte_range function of mprotect.c, enabling an attacker to escalate local privilege without additional execution privileges.
Mitigation and Prevention
Explore the steps below to mitigate the risks associated with CVE-2021-39802.
Immediate Steps to Take
- Regularly monitor vendor security bulletins for patches and updates related to the vulnerability.
- Apply relevant security patches provided by Android to address this vulnerability.
Long-Term Security Practices
- Implement the principle of least privilege to restrict access rights for users and applications.
- Conduct routine security assessments and penetration testing to identify and rectify vulnerabilities proactively.
Patching and Updates
Ensure timely application of security patches released by Android to mitigate the CVE-2021-39802 vulnerability.