Full Disclosure: Re: Fwd: VSFTPD Remote Heap Overrun (low severity)

[Ramon de C Valle <rcvalle () redhat com>]

> If you want to prevent apps from reading zoneinfo files that a user
> can write and read files a user can write, you will loose.
>
> Why are you setting up the chroot with content a user can write too?
> If you simply prevent him from writing to /usr/share, won't that
> solve
> the problem?
Not really. Because, in fact, the user, when chrooted, is writing to /home/user/usr/share/zoneinfo/. I've suggested a 
different file context for /home/(.*)/usr/share/zoneinfo(/.*) in vsftpd policy module. But I don't think this will be 
necessary due to the recent findings about vsftpd.

-- 
Ramon de C Valle / Red Hat Security Response Team

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