Date: Tue, 15 Dec 2009 07:43:28 +0000 From: Michal <ml@infosec.pl> To: freebsd-security@freebsd.org Subject: ZFS bug - candidate for Security Advisory? Message-ID: <4B273E20.80101@infosec.pl>
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Hello, On 10/11/2009 in "HEADS UP: Important bug fix in ZFS replay code!" post on freebsd-fs PJD wrote: "There was important bug in ZFS replay code. If there were setattr logs (not related to permission change) in ZIL during unclean shutdown, one can end up with files that have mode set to 07777. This is very dangerous, especially if you have untrusted local users, as this will set setuid bit on such files. Note that FreeBSD will remove setuid bits when someone will try to modify the file, but it is still dangerous." It is not fixed in 8.0 as I got bitten by this bug just recently (and other users report it on freebsd-fs). In my case it was about ten files in /var/www, / and two users home directory. Is it feasible to issue a SA and warn people? As far as I understand PJD post it's got important security implications. I'm wondering how many systems are sitting out there with bunch of 7777 files all over the place because administrator/user is not following freebsd-fs. Cheers, Michal -- "There cannot be a crisis next week. My schedule is already full." -Henry Kissinger
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