CVE-2021-39782 : Vulnerability Insights and Analysis
Learn about CVE-2021-39782, a vulnerability in Android-12L allowing local privilege escalation without user interaction. Find mitigation steps and affected versions here.
This article provides insights into CVE-2021-39782, a vulnerability found in Android-12L that could lead to local privilege escalation through unauthorized SIM file modification.
Understanding CVE-2021-39782
CVE-2021-39782 is a security vulnerability impacting Android-12L, allowing potential privilege escalation without the need for user interaction.
What is CVE-2021-39782?
The vulnerability in the Telephony component of Android-12L permits unauthorized changes to the PLMN SIM file, leading to local privilege escalation.
The Impact of CVE-2021-39782
The vulnerability could result in local users gaining escalated privileges without requiring additional privileges while bypassing user interaction.
Technical Details of CVE-2021-39782
Android-12L's vulnerability details and affected systems are as follows:
Vulnerability Description
- Unauthorized modification of the PLMN SIM file
- Missing permission check leads to local privilege escalation
Affected Systems and Versions
- Product: Android
- Version: Android-12L
Exploitation Mechanism
The vulnerability is exploited by modifying the PLMN SIM file without proper permission checks, enabling the escalation of privileges.
Mitigation and Prevention
Addressing CVE-2021-39782 includes immediate actions and long-term security practices.
Immediate Steps to Take
- Apply official patches provided by Android
- Monitor for any unauthorized system changes
Long-Term Security Practices
- Regularly update the operating system and security patches
- Implement least privilege access controls
Patching and Updates
Google regularly releases security bulletins and patches for Android-12L. Stay updated with the latest security releases to mitigate the risk of privilege escalation.