CVE-2021-39707 : Vulnerability Insights and Analysis
Learn about CVE-2021-39707, a risk in Android allowing unauthorized phone call initiation, leading to local privilege escalation. Take immediate action with provided security updates.
CVE-2021-39707 is a vulnerability found in the AppRestrictionsFragment.java component in Android that may allow unauthorized initiation of phone calls, potentially leading to a local privilege escalation without additional permissions.
Understanding CVE-2021-39707
CVE-2021-39707 involves a security issue in Android that could be exploited to escalate privileges locally without further execution privileges, posing a risk of unauthorized phone call initiation without user interaction.
What is CVE-2021-39707?
The vulnerability in the AppRestrictionsFragment.java file of Android could be abused to start phone calls without proper permissions, creating a scenario for local privilege escalation within versions Android-10, Android-11, and Android-12.
The Impact of CVE-2021-39707
The vulnerability enables a potential attacker to exploit the confused deputy issue, allowing them to escalate privileges and initiate phone calls on affected Android devices without user consent, potentially compromising user data and system security.
Technical Details of CVE-2021-39707
CVE-2021-39707 presents the following technical information:
Vulnerability Description
The vulnerability arises from a flaw in the handling of phone call initiation permissions in the AppRestrictionsFragment.java file, which could be leveraged by malicious actors to perform unauthorized actions.
Affected Systems and Versions
The following systems and versions are impacted:
- Product: Android
- Versions: Android-10, Android-11, Android-12
Exploitation Mechanism
The issue allows a potential attacker to exploit a confused deputy situation, bypassing permission checks to start phone calls without the necessary authorization, leading to local privilege escalation.
Mitigation and Prevention
It is crucial to take immediate and long-term security measures to mitigate the risks associated with CVE-2021-39707.
Immediate Steps to Take
- Apply patches and updates provided by the vendor
- Monitor and review phone call activities on Android devices for unauthorized actions
Long-Term Security Practices
- Regularly update the Android operating system to the latest version
- Educate users about security best practices to prevent exploitation of vulnerabilities
Patching and Updates
- Google Android has released security updates addressing CVE-2021-39707. It is recommended to promptly apply these patches to secure affected devices.