CVE-2021-0304 : Exploit Details and Defense Strategies

This article provides insights into CVE-2021-0304, a vulnerability affecting Android devices that could lead to information disclosure.

Understanding CVE-2021-0304

CVE-2021-0304 is a security vulnerability found in several functions of GlobalScreenshot.java on Android devices. It poses a risk of permission bypass through an unsafe PendingIntent, potentially exposing the user's contacts without requiring user interaction.

What is CVE-2021-0304?

The vulnerability in GlobalScreenshot.java on Android devices allows for a possible permission bypass via an insecure PendingIntent. This flaw can result in the disclosure of local information regarding the user's contacts, with the need for user execution privileges but without user interaction.

The Impact of CVE-2021-0304

The impact of CVE-2021-0304 lies in the potential local information disclosure of a user's contacts on affected Android versions, including Android-10, Android-8.0, Android-8.1, and Android-9. Due to the nature of the vulnerability, exploitation could occur without any user interaction.

Technical Details of CVE-2021-0304

This section explores the technical aspects of CVE-2021-0304 concerning the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from the unsafe PendingIntent within GlobalScreenshot.java, enabling a possible permission bypass and subsequent disclosure of the user's contacts without user interaction.

Affected Systems and Versions

Android devices running versions Android-10, Android-8.0, Android-8.1, and Android-9 are affected by CVE-2021-0304. It is crucial for users of these versions to be aware of the associated risks.

Exploitation Mechanism

Exploitation of CVE-2021-0304 involves leveraging the unsafe PendingIntent to bypass permissions and access the user's contact information without the need for user interaction.

Mitigation and Prevention

In this section, we discuss the steps to mitigate the risks posed by CVE-2021-0304 and prevent similar vulnerabilities in the future.

Immediate Steps to Take

Users are advised to update their Android devices to the latest security patches provided by the vendor to address CVE-2021-0304. Maintaining device security hygiene is essential.

Long-Term Security Practices

Practicing good security habits such as avoiding suspicious links, downloading apps from trusted sources, and regularly updating the device can help enhance long-term security.

Patching and Updates

Regularly checking for and applying software updates and security patches released by the Android vendor is crucial in safeguarding devices against known vulnerabilities like CVE-2021-0304.