Check the code loop gaffe hits the register

On Wednesday, March 4, Let & # 39; s Encrypt, the free and automated digital certification authority, will briefly become Let & # 39; s Revoke, to cancel the issuance of more than three million defective HTTPS certificates.

In a publication At the online service forum on Saturday, Jacob Hoffman-Andrews, chief technologist at EFF, said that a bug had been found in Boulder's code, the automated management environment for certificates from Let's Encrypt.

Boulder checks the authorization of the certification authority (CAA) registers to ensure that a Let & # 39; s Encrypt subscriber controls the domain names for which it requests HTTPS certificates. The bug, introduced on July 25, 2019, was an error in the way the tool's Go code iterated over domain names.

Free HTTPS certificates for all Let & # 39; s Encrypt open the doors of the world + dog

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"The immediate cause of the bug was a common error in Go: taking a reference to a loop iterator variable," explained Hoffman-Andrews in the error report.

So when Boulder iterated over, for example, a group of 10 domain names requiring a new CAA check, he would check a domain name 10 times instead of checking each of the 10 domains once.

"This means in practice that if a subscriber has validated a domain name at time X and the CAA registrations for this domain at time X have enabled Lets Encrypt to be issued, this subscriber could issue a certificate containing this domain name up to X + 30 days, even if someone later installed CAA registrations on this domain name that prohibit issuance by Lets Encrypt, "continued Hoffman-Andrews.

A code fix was deployed approximately two hours after the discovery of the programming error, although there are still 3,048,289 of the approximately 116 million digital certificates that remain to be revoked. About one million of the set of defective certificates are duplicates.

The owners of the certificates concerned, who would have been notified by e-mail, have until March 4, 0000 UTC to renew and replace their certificates. The process for those who use the Certbot The command line tool is simple in theory:

certbot renew --force-renewal

But difficulty reports on the Let & # 39; s Encrypt forum suggests that not everyone will benefit from a hassle-free update process.

On Wednesday, Let & # 39; s Encrypt, which is supported by the Internet Security Research Group (ISRG), will revoke certificates that have not been repaired, which will cause website visitors to view security warnings until To have the problem resolved.

For those who may have missed or deleted the notification email, Let & # 39; s Encrypt has released a list of affected serial numbers which can be downloaded. Affected individuals can search for their account identifiers for associated certificate numbers. There is also a Web page to check if a site is relying on an assigned certificate.

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