I’m running Ubuntu Quantal (version 12.10), which no longer receives security updates from Canonical. What’s the quickest way to update my copy of bash against the big vulnerability reported today?
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The cleanest way is to compile from source.
The correct way is to upgrade.
The wrong way is to get the package from a release which has patched that (according to this question, fixes have been released for supported versions - 10.04, 12.04, 14.04) and install it.
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It is possible to download the Precise (12.04) Bash package from http://packages.ubuntu.com/precise/bash and install it on Quantal (12.10).
I have been running this on a server all day and haven't noticed any problems. I plan to upgrade the server, but for a number of reasons I can't do it for a couple of weeks. This is only a stopgap solution.
To do this you need to follow the link above, choose which architecture your system is running (amd64 or i386) and download the relevant package. It can then be installed using dpkg, with something like:
sudo dpkg -i /path/to/download/bash_4.2-2ubuntu2.3_amd64.deb
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