Attacker Accessed Dozens of Repositories After OAuth Token Theft

GitHub has uncovered that dozens of corporations had been compromised by a facts thief that utilized stolen OAuth tokens to entry their personal repositories.

The developer platform’s security crew opened an investigation into the marketing campaign all over a week back and had eventually notified all the identified victims by yesterday.

GitHub CSO, Mike Hanley, claimed that 3rd-party OAuth person tokens maintained by Heroku and Travis CI were being abused by the attacker. Having said that, it’s not believed they have been stolen by means of a compromise of GitHub alone as the system does not keep the tokens in their original, usable format, he additional.

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“Our analysis of other actions by the threat actor indicates that the actors may well be mining the downloaded non-public repository contents, to which the stolen OAuth token had entry, for tricks that could be utilised to pivot into other infrastructure,” Hanley spelled out.

Amid the corporations impacted is application registry npm.

“The initial detection connected to this marketing campaign happened on April 12 when GitHub Security recognized unauthorized access to our npm manufacturing infrastructure making use of a compromised AWS API vital,” mentioned Hanley.

“Based on subsequent investigation, we think this API key was obtained by the attacker when they downloaded a established of private npm repositories employing a stolen OAuth token from just one of the two afflicted third-party OAuth purposes explained above.”

Immediately after finding the broader marketing campaign, GitHub’s security workforce revoked tokens linked with GitHub and npm’s inner use of the compromised OAuth applications.

The Travis CI team reported yesterday that it had revoked and reissued all non-public buyer auth keys and tokens integrating Travis CI with GitHub but that it does not feel the issue is a risk to buyers.

“On April 15 2022, Travis CI personnel were educated that certain non-public shopper repositories may possibly have been accessed by an specific who made use of a guy-in-the-center 2FA attack, leveraging a 3rd-party integration token,” it stated.

“Upon even more critique that exact same working day, Travis CI staff discovered that the hacker breached a Heroku assistance and accessed a personal software OAuth key made use of to combine the Heroku and Travis CI application. This crucial does not present access to any Travis CI customer repositories or any Travis CI client information. We comprehensively investigated this issue and discovered no evidence of intrusion into a personal customer repository (i.e. supply code) as the OAuth vital stolen in the Heroku attack does not supply that variety of entry.”

Heroku has revoked all OAuth tokens from the Heroku Dashboard GitHub integration and has quickly suspended the issuing of tokens from the Heroku Dashboard.