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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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How the SolarWinds Hackers Bypassed Duo’s Multi-Factor Authentication

Schneier on Security

This is interesting : Toward the end of the second incident that Volexity worked involving Dark Halo, the actor was observed accessing the e-mail account of a user via OWA. Logs from the Exchange server showed that the attacker provided username and password authentication like normal but were not challenged for a second factor through Duo.

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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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NSA on Authentication Hacks (Related to SolarWinds Breach)

Schneier on Security

The NSA has published an advisory outlining how “malicious cyber actors” are “are manipulating trust in federated authentication environments to access protected data in the cloud.” From the summary : Malicious cyberactors are abusing trust in federated authentication environments to access protected data.

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Apple to Add Manual Authentication to iMessage

Schneier on Security

Signal has had the ability to manually authenticate another account for years. iMessage is getting it : The feature is called Contact Key Verification, and it does just what its name says: it lets you add a manual verification step in an iMessage conversation to confirm that the other person is who their device says they are.

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Leaving Authentication Credentials in Public Code

Schneier on Security

Examples included: Azure Active Directory API Keys GitHub OAuth App Keys Database credentials for providers such as MongoDB, MySQL, and PostgreSQL Dropbox Key Auth0 Keys SSH Credentials Coinbase Credentials Twilio Master Credentials.

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Crooks Bypassed Google’s Email Verification to Create Workspace Accounts, Access 3rd-Party Services

Krebs on Security

Google says it recently fixed an authentication weakness that allowed crooks to circumvent the email verification required to create a Google Workspace account, and leverage that to impersonate a domain holder at third-party services that allow logins through Google’s “Sign in with Google” feature.