Gentoo Archives: gentoo-security

From: Joe Knall <joe.knall@×××.net>
To: gentoo-security@l.g.o
Subject: Re: [gentoo-security] mount noexec and ro
Date: Sat, 09 Dec 2006 02:40:25
Message-Id: 200612090334.31689.joe.knall@gmx.net
In Reply to: Re: [gentoo-security] mount noexec and ro by Miguel Sousa Filipe
On Thu, 2006-12-07 18:44 Miguel Sousa Filipe wrote:
> Hi, > > On 11/4/06, Joe Knall <joe.knall@×××.net> wrote: > > On Sat, 2006-11-04 16:00 Paul de Vrieze wrote: > > > On Saturday 04 November 2006 12:11, Joe Knall wrote: > > > > can/does mounting a partition with noexec, ro etc. provide > > > > additional security or are those limitations easy to > > > > circumvent? > > > > > > > > Example: webserver running chrooted > > > > all libs and executables (apache, lib, usr ...) on read only > > > > mounted partition /srv/www, data dirs (logs, htdocs ...) on > > > > partition /srv/www/data mounted with noexec (but rw of course), > > > > no cgi needed. > > > > Server is started with "chroot /srv/www /apache/bin/httpd -k > > > > start". > > > > > > Besides this, you must also add nodev to prevent those kinds of > > > circumventions > > > > > > Paul > > > > correct, it's atually like this > > /srv/www type ext3 (ro,nosuid,nodev,acl,user_xattr) > > /srv/www/data type ext3 (rw,noexec,nosuid,acl,user_xattr) > > I cannot have any kind of a intrepreted language supported in those > environments.. > or a simple perl/php/lisp "data" file can circunvent those attacks!
When I get you right, you mean the P in Lamp makes these limitations (ro, noexec, nodev, chroot ...) nonsense. Ok, what makes you think so? How do you do it (get a shell, root access, hijack the box ...)? What's a better approach to prevent it? Joe -- gentoo-security@g.o mailing list

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Re: [gentoo-security] mount noexec and ro ascii <ascii@××××××××.com>