CVE-2021-39643 : Security Advisory and Response
Learn about CVE-2021-39643, a critical vulnerability affecting the Android kernel that allows local privilege escalation without user interaction. Find details and mitigation steps.
This CVE-2021-39643 information pertains to a vulnerability in Android kernel that could allow for local privilege escalation.
Understanding CVE-2021-39643
This section will provide insights into the nature and impact of the CVE.
What is CVE-2021-39643?
The vulnerability lies in the ic_startRetrieveEntryValue function of acropora/app/identity/ic.c, leading to a bypass of defense mechanisms. Exploitation can result in local privilege escalation without the need for user interaction.
The Impact of CVE-2021-39643
The vulnerability allows attackers to achieve privilege elevation on the affected Android kernel, potentially leading to unauthorized system execution.
Technical Details of CVE-2021-39643
In this section, we will delve into the technical aspects of CVE-2021-39643.
Vulnerability Description
The flaw in ic_startRetrieveEntryValue lacks validation of return values, paving the way for the defense-in-depth bypass.
Affected Systems and Versions
- Product: Android
- Affected Version: Android kernel
Exploitation Mechanism
Attackers can exploit this vulnerability to locally escalate privileges without requiring any user interaction.
Mitigation and Prevention
This section will suggest measures to prevent and mitigate the risks posed by CVE-2021-39643.
Immediate Steps to Take
- Regularly monitor security bulletins and updates from reliable sources.
- Apply patches promptly to address the vulnerability.
Long-Term Security Practices
- Implement the principle of least privilege to limit system access.
- Conduct regular security audits and penetration testing to uncover vulnerabilities.
Patching and Updates
- Stay informed about security advisories and updates from the Android security bulletin.