Messages in this thread | | | Date | Thu, 21 Jun 2007 19:23:44 +0200 | From | Adrian Bunk <> | Subject | Re: [PATCH] signed binaries support [0/4] |
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On Thu, Jun 21, 2007 at 06:29:17PM +0200, Alexander Wuerstlein wrote: > On 070621 18:19, Adrian Bunk <bunk@stusta.de> wrote: > > On Thu, Jun 21, 2007 at 05:55:16PM +0200, Johannes Schlumberger wrote: > > > > > Hi, > > > > Hi Johannes, > > > > > We (two students of CS) built a system for signing binaries and verifying them > > > before executing. Our main focus was to implement a way to inhibit execution > > > of suid-binaries, which are not trustworthy (i.e. not signed). > > >... > > > > doesn't anyone who is able to install a not trustworthy suid-binary > > already have the priviliges to do anything he wants to without requiring > > an suid bit? > > Yes, quite correct in most cases. But if you have taken control of a computer > on of the more common ways to keep the control for some time is the > installation of a suid-binary (e.g. as part of a rootkit).
There are so many ways for manipulating a computer that controlling setuid binaries hardly brings a real security gain.
> One could also imagine a scenario where an attacker controls some filesystems > (on external storage perhaps) where he can of course manipulate the suid bit, > but he does not have direct control over the attacked system unless he can > execute that file.
And unless the filesystem is mounted without nosuid...
> Ciao, > > Alexander Wuerstlein.
cu Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed
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