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This is a completely bonkers, Slammer-level hair-on-fire vulnerability. Remember Heartbleed? This is much worse. If you have a computer with an OS other than Windows or Android, your safest bet is to unplug it from the Internet until the bash developers figure this all out.

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And my servers? Is there anything I can do without taking them offline?

Well, you could remove bash entirely (say, by replacing it with a link to dash). Doing this will likely break things, however, up to and including rendering the machine unbootable depending on which distribution it is and how the init scripts are written.

You could replace bash with e.g. a perl script that strips parenthesis from your environment variables, and then invokes a differently named copy of bash. That might not break anything. Then again, it might.

> Well, you could remove bash entirely (say, by replacing it with a link to dash)

Just did this, except I accidentally removed both bash and dash... it wasn't fun having to compile bash from source with zsh. For whatever reason it absolutely did not want to work.

But all back to normal now.

I patched mine with a apt-get update sequence. It fixed the bug (first fix, not yet the second), and I didn't have to take the server down. Everything stayed up.

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