CVE-2018-9543 : Security Advisory and Response

Android devices are at risk of local information exposure due to improper data partition erasure during a factory reset.

Understanding CVE-2018-9543

This CVE involves a vulnerability in the trim_device function of f2fs_format_utils.c that affects various versions of Android.

What is CVE-2018-9543?

The data partition may not be properly erased during a factory reset, leading to potential local information exposure without requiring additional permissions.
Exploitation of this vulnerability does not need user interaction.
Android versions 7.0, 7.1.1, 7.1.2, 8.0, 8.1, and 9 are impacted.

The Impact of CVE-2018-9543

Risk of local information exposure post factory reset without additional permissions.

Technical Details of CVE-2018-9543

This section provides more technical insights into the vulnerability.

Vulnerability Description

The trim_device function in f2fs_format_utils.c fails to properly erase the data partition during a factory reset.

Affected Systems and Versions

Product: Android
Versions: Android-7.0, 7.1.1, 7.1.2, 8.0, 8.1, 9

Exploitation Mechanism

No user interaction required for exploitation.

Mitigation and Prevention

Protect your system from CVE-2018-9543 with these steps:

Immediate Steps to Take

Regularly update your Android device to the latest version.
Avoid performing factory resets on untrusted devices.

Long-Term Security Practices

Implement full device encryption to safeguard data.
Use secure data wiping tools before discarding or selling your device.

Patching and Updates

Stay informed about security bulletins and patches released by Google for Android devices.