Messages in this thread | | | Date | Fri, 17 Nov 2000 09:35:37 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Linux 2.2.18pre21 |
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Peter Samuelson wrote: > > [I wrote] > > > mkdir("foo") > > > chroot("foo") > > [H. Peter Anvin] > > BUG: you *MUST* chdir() into the chroot jail before it does you any > > good at all! > > No, it wasn't a bug! It was a demonstration. The above code is > executed not by the application but by the *attacker* who has managed > to 0wn the existing jail. > > Doing the additional chroot("foo") without already being in "foo" > basically replaces the chroot jail you *were* in, so you are now out. > > The sequence I posted is just the simplest un-chroot procedure I know, > to explain why chroot cannot sandbox the superuser. >
Right. Gotcha.
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