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Google Patches Bug Leaking Phone Numbers Tied to Accounts

In a significant move to mitigate potential user security threats, Google recently patched an alarming vulnerability that exposed partial phone numbers linked to millions of Google accounts.

Notably, this flaw created a potential goldmine for cybercriminals seeking to execute sophisticated phishing and SIM-swapping attacks.

The Vulnerability

The exposed security flaw allowed malicious entities to brute force an individual’s Google account recovery phone number, merely by using a basic set of information: a user’s profile name and an easily retrievable partial phone number.

With the right brute force script automating the guessing process, an attacker could potentially retrieve the complete phone number linked to the Google account.

This worrying bug came to light when a security researcher discovered that Google’s Account Recovery page would provide a partially redacted phone number tied to an account when presented with a valid email address.

Having a small portion of the phone number and the brute forcing technique, it was a matter of time before unmasking the complete number.

Potential Impact

The ability for an attacker to obtain a user’s complete phone number, linked to their Google account, presents a disturbing breach of privacy and security.

This information offers an advantageous starting point for both phishing attacks and SIM-swapping schemes.

In a real-world scenario, a cybercriminal could initiate a phishing attack by impersonating Google and requesting sensitive account details under the guise of addressing a security concern, thereby exploiting the users’ trust in the brand.

Furthermore, with access to the phone number, it is possible to execute a SIM swap attack to seize control of the victim’s number, potentially leading to repercussions such as identity theft and financial loss.

The Fix

Upon the vulnerability’s discovery, Google engaged proactively to mitigate the issue.

It has now implemented a patch that removes the display of a partially redacted phone number in the Account Recovery process without additional authentication.

In the meantime as users, it serves as a stark reminder to secure our accounts.

Enable two-step verification on your Google account and consider using a security key or Google’s in-app prompt for the most reliable form of protection.

Also, be wary of unsolicited messages urging action related to your Google account.

Follow-Up Reading

For further insights into similar cybersecurity concerns and practical advice, consider the following resources:

• The Guardian: Security experts braced for more cyber-attacks on Google and Facebook
• ScienceDirect: A Survey on Security and Privacy Issues in Smart Home Devices
• KrebsOnSecurity: Avoid Becoming a Victim of SIM Swapping