Dead Google Apps Domains Can Be Compromised By New Owners

An anonymous reader quotes a report from Ars Technica: Lots of startups use Google's productivity suite, known as Workspace, to handle email, documents, and other back-office matters. Relatedly, lots of business-minded webapps use Google's OAuth, i.e. 'Sign in with Google.' It's a low-friction feedback loop -- up until the startup fails, the domain goes up for sale, and somebody forgot to close down all the Google stuff. Dylan Ayrey, of Truffle Security Co., suggests in a report that this problem is more serious than anyone, especially Google, is acknowledging. Many startups make the critical mistake of not properly closing their accounts -- on both Google and other web-based apps -- before letting their domains expire.

Given the number of people working for tech startups (6 million), the failure rate of said startups (90 percent), their usage of Google Workspaces (50 percent, all by Ayrey's numbers), and the speed at which startups tend to fall apart, there are a lot of Google-auth-connected domains up for sale at any time. That would not be an inherent problem, except that, as Ayrey shows, buying a domain allows you to re-activate the Google accounts for former employees if the site's Google account still exists.

With admin access to those accounts, you can get into many of the services they used Google's OAuth to log into, like Slack, ChatGPT, Zoom, and HR systems. Ayrey writes that he bought a defunct startup domain and got access to each of those through Google account sign-ins. He ended up with tax documents, job interview details, and direct messages, among other sensitive materials. A Google spokesperson said in a statement: 'We appreciate Dylan Ayrey's help identifying the risks stemming from customers forgetting to delete third-party SaaS services as part of turning down their operation. As a best practice, we recommend customers properly close out domains following these instructions to make this type of issue impossible. Additionally, we encourage third-party apps to follow best-practices by using the unique account identifiers (sub) to mitigate this risk.'

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