Android Framework: privilege escalation flaw under attack

What is affected

Android Framework is found on ordinary personal computers and phones, so this is not only a problem for companies. If you use it and have not updated since the fix was released, you are exposed.

Android Framework contains an unspecified vulnerability that allows for privilege escalation.

What an attacker can do

This is a privilege escalation flaw. It lets an attacker turn limited access into full administrator control. Attackers pair it with another flaw or a malicious file: once anything of theirs runs on the device, this bug lets it take over completely.

How it is reached

Needs access to the device or a file opened on it

Access the attacker needs

A basic user account

Does the victim have to do something?

Yes, the victim must open or click something

What to do

1. Update Android Framework now. Open the update or "About" screen, install whatever is offered and restart the app or device, because the fix is not active until you do.
2. Turn on automatic updates so the next fix arrives without you having to look for it.
3. If your device is too old to receive this update, stop using the affected app for anything sensitive and plan a replacement.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vendor advisories and fixes

• source.android.comsource.android.com/docs/security/bulletin/2024-11-01

How urgent is it

CISA added this vulnerability to its Known Exploited Vulnerabilities catalogue on November 7, 2024, which means there is reliable evidence of attacks in the wild. US federal agencies must fix it by November 28, 2024, a deadline that has already passed. That deadline does not bind anyone else, but it shows how seriously the agency rates it.

The EPSS model estimates a 0.7% probability that this flaw will be exploited somewhere in the next 30 days. That is higher than 52% of all scored vulnerabilities.

Its CVSS severity score is 7.3 out of 10 (high), as recorded in the US National Vulnerability Database.

Technical description

In shouldHideDocument of ExternalStorageProvider.java, there is a possible bypass of a file path filter designed to prevent access to sensitive directories due to incorrect unicode normalization. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation.