CVE-2019-9939 : Exploit Details and Defense Strategies

SHAREit app for Android versions prior to 4.0.36 has a security vulnerability that allows a remote attacker to bypass authentication and gain access to devices on the same network or public Wi-Fi hotspots.

Understanding CVE-2019-9939

What is CVE-2019-9939?

The vulnerability in SHAREit app for Android versions before 4.0.36 enables a remote attacker to bypass authentication by requesting a non-existent page, leading to unauthorized access to devices.

The Impact of CVE-2019-9939

The vulnerability allows attackers to add their device to the list of recognized devices, potentially compromising sensitive information during file transfers.

Technical Details of CVE-2019-9939

Vulnerability Description

SHAREit app for Android before version 4.0.36 allows remote attackers to bypass authentication by accessing a non-existent page.

Affected Systems and Versions

SHAREit app for Android versions prior to 4.0.36

Exploitation Mechanism

Attackers exploit the vulnerability by attempting to access a non-existent page, triggering the app to respond with a 200 status code and adding the attacker's device to the recognized devices list.

Mitigation and Prevention

Immediate Steps to Take

Update SHAREit app to version 4.0.36 or newer to mitigate the vulnerability.
Avoid using public Wi-Fi hotspots for file transfers.

Long-Term Security Practices

Regularly update apps to the latest versions to patch security vulnerabilities.

Patching and Updates

Stay informed about security updates for the SHAREit app and apply them promptly.