As you note, this appears to have been fixed in squashfs 3.1 in Feisty.
I've opened an Edgy task in case anyone wants to fix this there.
** Changed in: squashfs (Ubuntu)
Status: Unconfirmed => Fix Released
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unsquashfs in Ubuntu 6.10 "Edgy" doesn't care about setuid/setgid
https://bugs.launchpad.net/bugs/89417
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