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Failures in Twitter’s Two-Factor Authentication System

Schneier on Security

Twitter is having intermittent problems with its two-factor authentication system: Not all users are having problems receiving SMS authentication codes, and those who rely on an authenticator app or physical authentication token to secure their Twitter account may not have reason to test the mechanism.

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Sendgrid Under Siege from Hacked Accounts

Krebs on Security

Email service provider Sendgrid is grappling with an unusually large number of customer accounts whose passwords have been cracked, sold to spammers, and abused for sending phishing and email malware attacks. “And I just am not seeing anything this egregious in terms of viruses and spams from the other email service providers.”

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Booking.com Phishers May Leave You With Reservations

Krebs on Security

Booking.com said it now requires 2FA , which forces partners to provide a one-time passcode from a mobile authentication app (Pulse) in addition to a username and password. Booking.com did not respond to questions about that, and its current account security advice urges customers to enable 2FA.

Phishing 263
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Facebook, Instagram, TikTok and Twitter Target Resellers of Hacked Accounts

Krebs on Security

Facebook, Instagram , TikTok , and Twitter this week all took steps to crack down on users involved in trafficking hijacked user accounts across their platforms. Facebook said it targeted a number of accounts tied to key sellers on OGUsers, as well as those who advertise the ability to broker stolen account sales. THE MIDDLEMEN.

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FBI: Spike in Hacked Police Emails, Fake Subpoenas

Krebs on Security

The Federal Bureau of Investigation (FBI) is urging police departments and governments worldwide to beef up security around their email systems, citing a recent increase in cybercriminal services that use hacked police email accounts to send unauthorized subpoenas and customer data requests to U.S.-based based technology companies.

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Feds Charge Five Men in ‘Scattered Spider’ Roundup

Krebs on Security

The targeted SMS scams asked employees to click a link and log in at a website that mimicked their employer’s Okta authentication page. The feds then obtained records from Virgin Media, which showed the address was leased for several months to Tyler Buchanan , a 22-year-old from Dundee, Scotland. Click to enlarge.

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FBI Arrests Alleged Owner of Deer.io, a Top Broker of Stolen Accounts

Krebs on Security

FBI officials last week arrested a Russian computer security researcher on suspicion of operating deer.io , a vast marketplace for buying and selling stolen account credentials for thousands of popular online services and stores. also is a favored marketplace for people involved in selling phony social media accounts.