New analysis has pulled again the curtain on a “deficiency” in Google’s “Register with Google” authentication move that exploits a quirk in area possession to achieve entry to delicate information.
“Google’s OAuth login would not shield in opposition to somebody buying a failed startup’s area and utilizing it to re-create e-mail accounts for former workers,” Truffle Safety co-founder and CEO Dylan Ayrey mentioned in a Monday report.
“And whilst you cannot entry previous e-mail information, you should use these accounts to log into all of the totally different SaaS merchandise that the group used.”
The San Francisco-based firm mentioned the difficulty has the potential to place thousands and thousands of American customers’ information in danger just by buying a defunct area related to a failed startup and gaining unauthorized entry to previous worker accounts associated to varied functions like OpenAI ChatGPT, Slack, Notion, Zoom, and even HR methods.
“Essentially the most delicate accounts included HR methods, which contained tax paperwork, pay stubs, insurance coverage info, social safety numbers, and extra,” Ayrey mentioned. “Interview platforms additionally contained delicate details about candidate suggestions, presents, and rejections.”
OAuth, quick for open authorization, refers to an open normal for entry delegation, permitting customers to grant web sites or functions entry to their info on different web sites with out having to offer their passwords. That is achieved by making use of an entry token to confirm the person’s identification and permit the service to entry the useful resource the token is meant for.
When “Register with Google” is used to check in to an software similar to Slack, Google sends the service a set of claims concerning the person, together with their e-mail handle and the hosted area, which may then be utilized to log customers into their accounts.
This additionally implies that if a service is solely counting on these items of data to authenticate customers, it additionally opens the door to a situation the place area possession modifications may permit an attacker to regain entry to previous worker accounts.
Truffle additionally identified Google’s OAuth ID token features a distinctive person identifier – the sub declare – that would theoretically forestall the issue, however that has been discovered to be unreliable. It is price noting that Microsoft’s Entra ID tokens embody the sub or oid claims to retailer an immutable worth per person.
Whereas Google initially responded to the vulnerability disclosure by stating that it’s supposed conduct, it has since re-opened the bug report as of December 19, 2024, awarding Ayrey a bounty of $1,337. It has additionally certified the difficulty as an “abuse-related methodology with excessive affect.”
Within the meantime, there are not any protections that downstream software program suppliers can take to guard in opposition to the vulnerability in Google’s OAuth implementation. The Hacker Information has reached out to Google for additional remark, and we’ll replace the story if we hear again.
“As a person, as soon as you’ve got been off-boarded from a startup, you lose your means to guard your information in these accounts, and you’re topic to no matter destiny befalls the way forward for the startup and area,” Ayrey mentioned. “With out immutable identifiers for customers and workspaces, area possession modifications will proceed to compromise accounts.”