Bugtraq mailing list archives
Re: /proc filesystem allows bypassing directory permissions on Linux
From: Pavel Machek <pavel () ucw cz>
Date: Sat, 24 Oct 2009 00:05:44 +0200
On Sat 2009-10-24 01:12:51, Dan Yefimov wrote:
On 24.10.2009 0:35, Matthew Bergin wrote:doesnt look like the original owner is trying to write to it. Shows it cant, it had guest write to it via the proc folders bad permissions. Looks legitimatePlease tell me, who issued 'chmod 0666 unwritable_file'? Was that an attacker? No, that was the owner of 'unwritable_file', nobody else. What the 0666 file mode means? It means, that everybody can write to the file, can't he? So why do you believe that pretension legitimate?
Original owner did chmod 666... after making sure traditional unix permissions protect the file. Please look at original mail; it was subtle but I believe I got it right, and file would not be writable with /proc unmounted. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
Current thread:
- Re: /proc filesystem allows bypassing directory permissions on Linux, (continued)
- Re: /proc filesystem allows bypassing directory permissions on Linux Pavel Machek (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Dan Yefimov (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Pavel Machek (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Dan Yefimov (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Ansgar Wiechers (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Derek Martin (Oct 28)
- Re: /proc filesystem allows bypassing directory permissions on Linux CaT (Oct 29)
- Re: /proc filesystem allows bypassing directory permissions on Linux Dan Yefimov (Oct 23)
- Re: /proc filesystem allows bypassing directory permissions on Linux Arturo 'Buanzo' Busleiman (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Pavel Machek (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Dan Yefimov (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Pavel Machek (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Dan Yefimov (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Tamber Penketh (Oct 26)
- Re: /proc filesystem allows bypassing directory permissions on Linux Pavel Machek (Oct 27)