Penetration Testing mailing list archives
Re: how an hacker can bypass a chrooted environement ?
From: "Justin Ferguson" <jnferguson () gmail com>
Date: Fri, 12 May 2006 15:37:02 -0700
The most typical is to create a directory, open a file handle and then chroot into that directory, then chdir'ing to the other directory, then ../../ up until root and then calling chroot again. Then suppose you can mount /proc, then you can cd to /proc/1/cwd. Or perhaps, depending on the vulnerable service using already existing file descriptors to fchdir() to freedom, what about mknod? shared memory? unix sockets? signals? kernel exploits? et cetera. I hope you are starting to get the point that chroot is a severly flawed concept. Yes many people try to limit what exists inside a jail, but that doesn't prevent me from uploading my own code through one method or another. On 5/12/06, alan <alan () clueserver org> wrote:
On Fri, 12 May 2006, Norbert François wrote: > Hi... > > I was wondering how an attacker can bypass a chrooted environement. A > (common) technique consist in finding a vulnerable program (in the > chrooted environnement) and injecting it a shellcode (i.e > ../../../../../../../bin/bash for ex.) by BoF. But normally, in the > chrooted environement, you volontarily add only necessary tools (like > ls, cat, less...), and vulnerable softwares are uncommon... > > So... how do they this "exploit" of bypassing the chroot ?
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Current thread:
- how an hacker can bypass a chrooted environement ? Norbert François (May 12)
- Re: how an hacker can bypass a chrooted environement ? alan (May 12)
- Re: how an hacker can bypass a chrooted environement ? Justin Ferguson (May 12)
- Re: how an hacker can bypass a chrooted environement ? Peter Kosinar (May 12)
- Re: how an hacker can bypass a chrooted environement ? Rob (May 12)
- Re: how an hacker can bypass a chrooted environement ? Tonnerre Lombard (May 12)
- Re: how an hacker can bypass a chrooted environement ? Norbert François (May 14)
- <Possible follow-ups>
- Re: how an hacker can bypass a chrooted environement ? Marco Ivaldi (May 16)
- RE: how an hacker can bypass a chrooted environement ? David M. Zendzian (May 17)
- Re: how an hacker can bypass a chrooted environement ? Chris Byrd (May 18)
- Re: how an hacker can bypass a chrooted environement ? Marco Ivaldi (May 17)
- Re: RE: how an hacker can bypass a chrooted environement ? john . fellers (May 18)
- Re: how an hacker can bypass a chrooted environement ? alan (May 12)