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0.0.0.0 Day - 18 Yr Old Vulnerability Let Attackers Bypass All Browser Security (cybersecuritynews.com)

submitted 1 month ago by Dnb@lemmy.dbzer0.com to c/technology@beehaw.org

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[–] dan@upvote.au 6 points 1 month ago* (last edited 1 month ago)

it makes connecting to localhost as easy as http://0:8080/ (for port 8080, but omit for port 80).

The thing is that it's not supposed to work, so it's essentially relying on undefined behaviour. Typing [::1]:8080 is nearly as easy.

skimming through these PRs, at least for WebKit, I don't see tests for shorthand IPs like 0 (and no Apple device to test with). What are the chances they missed those..?

I haven't seen the PRs, but IP comparison should really be using the binary form of the IPv4 address (a 32-bit number), not the human-friendly form.