The number of companies caught up in the Twilio hack keeps growing

The fallout from this month’s breach of safety supplier Twilio retains coming. Three new corporations—authentication service Authy, password supervisor LastPass, and meals supply service DoorDash—mentioned in current days that the Twilio compromise led to them being hacked.

The three corporations be a part of authentication service Okta and safe messenger supplier Sign within the doubtful membership of Twilio clients identified to be breached in follow-on assaults that leveraged the information obtained by the intruders. In all, safety agency Group-IB mentioned on Thursday, no less than 136 corporations have been equally hacked, so it is doubtless many extra victims can be introduced within the coming days and weeks.

Uncommonly resourceful

The compromises of Authy and LastPass are probably the most regarding of the brand new revelations. Authy says it shops two-factor authentication tokens for 75 million customers. Given the passwords the risk actor has already obtained in earlier breaches, these tokens could have been the one issues stopping the takeover of extra accounts. Authy, which Twilio owns, mentioned that the risk actor used its entry to log in to solely 93 particular person accounts and enroll new gadgets that might obtain one-time passwords. Relying on who these accounts belong to, that could possibly be very dangerous. Authy mentioned it has since eliminated unauthorized gadgets from these accounts.

LastPass mentioned the identical risk actor used knowledge taken from Twilio to achieve unauthorized entry by a single compromised developer account to parts of the password supervisor’s improvement atmosphere. From there, the phishers “took parts of supply code and a few proprietary LastPass technical info.” LastPass mentioned that grasp passwords, encrypted passwords and different knowledge saved in buyer accounts, and clients’ private info weren’t affected. Whereas the LastPass knowledge identified to be obtained is not particularly delicate, any breach involving a significant password administration supplier is critical, given the wealth of information it shops.

DoorDash additionally mentioned that an undisclosed variety of clients had their names, e mail addresses, supply addresses, cellphone numbers, and partial fee card numbers stolen by the identical risk actor. The risk actor obtained names, cellphone numbers, and e mail addresses from an undisclosed variety of DoorDash contractors.

As already reported, the preliminary phishing assault on Twilio was well-planned and executed with surgical precision. The risk actors had personal cellphone numbers of workers, greater than 169 counterfeit domains mimicking Okta and different safety suppliers, and the flexibility to bypass 2FA protections that used one-time passwords.

The risk actor’s capability to leverage knowledge obtained in a single breach to wage supply-chain assaults in opposition to the victims’ clients—and its capability to stay undetected since March—demonstrates its resourcefulness and ability. It is not unusual for corporations that announce breaches to replace their disclosures within the days or even weeks following to incorporate further info that was compromised. It will not be shocking if a number of victims right here do the identical.

If there is a lesson on this entire mess, it is that not all 2FA is equal. One-time passwords despatched by SMS or generated by authenticator apps are as phishable as passwords are, and that is what allowed the risk actors to bypass this final type of protection in opposition to account takeovers.

One firm that was focused however did not fall sufferer was Cloudflare. The explanation: Cloudflare workers relied on 2FA that used bodily keys corresponding to Yubikeys, which might’t be phished. Firms spouting the drained mantra that they take safety severely should not be taken severely until bodily key-based 2FA is a staple of their digital hygiene.