CVE-2021-39805 : What You Need to Know
Learn about CVE-2021-39805, an Android vulnerability allowing remote information disclosure via Bluetooth. Take immediate steps to patch and secure affected systems.
This article provides details about CVE-2021-39805, a vulnerability in Android that could lead to remote information disclosure through Bluetooth.
Understanding CVE-2021-39805
CVE-2021-39805 is an information disclosure vulnerability affecting Android systems.
What is CVE-2021-39805?
In l2cble_process_sig_cmd of l2c_ble.cc in Android, a missing bounds check could result in an out-of-bounds read leading to remote information disclosure via Bluetooth without requiring additional privileges.
The Impact of CVE-2021-39805
The vulnerability can be exploited remotely through Bluetooth, potentially exposing sensitive information without user interaction.
Technical Details of CVE-2021-39805
This section dives into the technical specifics of the CVE.
Vulnerability Description
The vulnerability in l2cble_process_sig_cmd of l2c_ble.cc allows for an out-of-bounds read due to a missing bounds check.
Affected Systems and Versions
- Product: Android
- Versions: Android-12, Android-12L
Exploitation Mechanism
The vulnerability can be exploited remotely through Bluetooth, posing a risk of sensitive data exposure.
Mitigation and Prevention
Explore the steps to mitigate and prevent exploitation of CVE-2021-39805.
Immediate Steps to Take
- Apply security patches provided by the vendor promptly.
- Consider disabling Bluetooth when not in use to reduce the attack surface.
Long-Term Security Practices
- Regularly update the Android system to the latest version.
- Implement network segmentation to contain potential attacks on Bluetooth.
Patching and Updates
Regularly monitor for security updates and patches from Android to address vulnerabilities like CVE-2021-39805.