Aikido Security found that deleted Google API keys can continue authenticating for a median of about 16 minutes and as long as 23 minutes, despite Google Cloud's UI claiming that once a key is deleted it can no longer make API requests. Dark Reading reports: Joe Leon, researcher at Belgian startup Aikido Security, recently analyzed the revocation window -- the time between a key's deletion and its last successful authentication -- for the cloud giant's API keys. In a blog post published today, Leon said Google Cloud Platform (GCP) customers expect API access to end immediately after the key is deleted, but this is not the case. In a series of tests, Leon found that the median revocation window was around 16 minutes, while the longest window was up to 23 minutes, "an incredibly long time" for API keys to continue authenticating successfully, he said.
And these windows have serious repercussions for organizations. "An attacker holding your deleted key can keep sending requests until one reaches a server that has not caught up. If Gemini is enabled on the project, they can dump files you have uploaded and exfiltrate cached conversations," Leon said. "The GCP console will not show the key, and it will not tell you the key is still working. You are trusting Google's infrastructure to eventually catch up."
[...] Leon tells Dark Reading the revocation windows for Google's API keys, as well as the unpredictable authentication success rates, complicate matters for incident response teams that are dealing with a potential breach. "This breaks the mental model IR teams have when responding to leaked credentials," he says. "It's assumed that when you click 'Delete' or 'Revoke' that the credential no longer works. Now IR teams need to remember that for GCP credentials, a window exists when that 'Deleted' credential still works for attackers."
To that end, Aikido recommended that security teams and IR personnel use a 30-minute window for Google API key deletions. Additionally, organizations should monitor their API requests by credential through the "Enabled APIs and services" portion of the GCP console, and review API requests by credential. "If you see unexpected usage from that credential after deletion, someone could be actively exploiting it," Leon wrote. Aikido reported the findings to Google, but the company closed the report as "won't fix," according to the blog post.
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