CVE-2020-0074 : Exploit Details and Defense Strategies

Android devices are affected by a vulnerability that could allow an app to bypass settings and become the default handler for arbitrary domains, potentially leading to a local privilege escalation.

Understanding CVE-2020-0074

This CVE affects the Android operating system, specifically versions 8.0, 8.1, 9, 10, and 11.

What is CVE-2020-0074?

The vulnerability resides in the verifyIntentFiltersIfNeeded function of PackageManagerService.java, enabling an app to circumvent settings and gain control as the default domain handler without user interaction.

The Impact of CVE-2020-0074

Exploitation could result in local elevation of privilege, requiring only User execution privileges without user involvement.

Technical Details of CVE-2020-0074

Android devices using affected versions are vulnerable to the following:

Vulnerability Description

The flaw allows malicious apps to manipulate settings and become the default handler for arbitrary domains, potentially leading to privilege escalation.

Affected Systems and Versions

Product: Android
Versions: Android-11, Android-8.0, Android-8.1, Android-9, Android-10

Exploitation Mechanism

Malicious apps can exploit verification filters to set themselves as the default domain handler.

Mitigation and Prevention

Proactive measures are crucial to prevent exploitation and enhance security:

Immediate Steps to Take

Regularly update Android devices to the latest security patches.
Avoid downloading apps from untrusted sources.
Monitor app permissions and revoke unnecessary access.

Long-Term Security Practices

Employ security best practices when developing apps.
Implement proper input validation to prevent settings manipulation.
Educate users about the risks of granting extensive permissions.

Patching and Updates

Stay informed about security bulletins from Android sources.
Apply patches promptly to address known vulnerabilities.