bugtraq - Re: /proc filesystem allows bypassing directory permissions on Linux

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Date: Mon, 26 Oct 2009 15:48:22 -0700
From: Matthew Dempsky <matthew@...psky.org>
To: Tony Finch <dot@...at.at>
Cc: pavel@....cz, bugtraq@...urityfocus.com
Subject: Re: /proc filesystem allows bypassing directory permissions on Linux

On Mon, Oct 26, 2009 at 9:01 AM, Tony Finch <dot@...at.at> wrote:
> Attacker uses openat() to open and modify the "private" file.

At least with Linux 2.6.18, you still need +x permission on the
directory to access its contents using openat(2).