Messages in this thread |  | | Date | Fri, 17 Nov 2000 05:22:26 -0600 | Subject | Re: Linux 2.2.18pre21 | From | Peter Samuelson <> |
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[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.
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