Vulnerability Development mailing list archives
Re: OT? Are chroots immune to buffer overflows?
From: Berend De Schouwer <bds () jhb ucs co za>
Date: 22 May 2002 09:03:53 +0200
On Wed, 2002-05-22 at 05:48, Jason Haar wrote:
[note: my question is WRT non-root chrooted jails - we all know about chroot'ing root processes!] Most buffer overflows I've seen attempt to infiltrate the system enough to run /bin/sh. In chroot'ed environments, /bin/sh doesn't (shouldn't!) exist - so they fail.
I've had someone try /usr/X11R6/bin/xterm! (no, there wasn't an xterm either :)
Is it as simple as that? As 99.999% of the system binaries aren't available in the jail, can a buffer overflow ever work?
Yes -- just append a binary /bin/sh to the end of the buffer overflow, and run that instead of exec("/bin/sh"). Try with a statically linked one first.
-- Cheers Jason Haar Information Security Manager Trimble Navigation Ltd. Phone: +64 3 9635 377 Fax: +64 3 9635 417
-- Berend De Schouwer
Current thread:
- Re: OT? Are chroots immune to buffer overflows?, (continued)
- Re: OT? Are chroots immune to buffer overflows? SpaceWalker (May 22)
- Re: OT? Are chroots immune to buffer overflows? Luciano Miguel Ferreira Rocha (May 23)
- Re: OT? Are chroots immune to buffer overflows? Nelson Sampaio Araujo Junior (May 24)
- Re: OT? Are chroots immune to buffer overflows? aazubel (May 23)
- Re: OT? Are chroots immune to buffer overflows? Luciano Miguel Ferreira Rocha (May 23)
- Re: OT? Are chroots immune to buffer overflows? Valdis . Kletnieks (May 22)
- Re: OT? Are chroots immune to buffer overflows? Kalle Andersson (May 22)
- Re: OT? Are chroots immune to buffer overflows? KF (May 23)
- Re: OT? Are chroots immune to buffer overflows? Edwin Groothuis (May 22)
- Re: OT? Are chroots immune to buffer overflows? Jose Nazario (May 23)
- Re: OT? Are chroots immune to buffer overflows? Kurt Seifried (May 23)
- Re: OT? Are chroots immune to buffer overflows? Berend De Schouwer (May 22)
- Re: OT? Are chroots immune to buffer overflows? L. Walker (May 22)
- Re: OT? Are chroots immune to buffer overflows? Jan Werner (May 23)
- Re: OT? Are chroots immune to buffer overflows? Greg Hunt (May 23)
- Re: OT? Are chroots immune to buffer overflows? Birger Toedtmann (May 22)
- Re: OT? Are chroots immune to buffer overflows? sd (May 22)
- Re: OT? Are chroots immune to buffer overflows? Andreas Ferber (May 22)
- Re: OT? Are chroots immune to buffer overflows? jove (May 23)
- Re: OT? Are chroots immune to buffer overflows? Dave Ahmad (May 23)
- Message not available
- Re: OT? Are chroots immune to buffer overflows? Jason Haar (May 23)
- Re: OT? Are chroots immune to buffer overflows? SpaceWalker (May 22)
- Re: OT? Are chroots immune to buffer overflows? dev-null (May 22)