From: Shane Warner (shane@aplv.com)
Date: Wed May 31 2006 - 15:55:33 EDT
One simple way would be to temporarily change the "nobody" user's shell to
/bin/bash from /bin/false or whatever you have it set to.
Something like usermod nobody -s /bin/bash would do the trick. Then su
nobody and run your strace from bash.
Just make absolutely sure to change it back to /bin/false when you are
finished.
Shane Warner
Director of IT
Answer Plus Inc
1840 East Sahara Suite 205
Las Vegas NV
http://www.aplv.com
(702) 388-7377
-----Original Message-----
From: Rizki Wicaksono [mailto:rizki.wicaksono@gmail.com]
Sent: Tuesday, May 30, 2006 9:23 PM
To: pen-test@securityfocus.com
Subject: Howto strace apache as nobody/apache user?
Hi List,
Does anyone know how to strace/ktrace-ing apache httpd server as
nobody/apache user ? Apache initially starting as root then it forks
into many process after leaving its root credentials, usually being
apache or nobody (depends on httpd.conf). So, by theory if I could be
apache/nobody user, I will be able to strace/ktrace-ing any process
that owned by apache/nobody user.
So i put small cmd.php shell to do that. With this simple code:
<pre><? passthru($_GET['cmd']); ?></pre>
Using my browser pointing to http://localhost/cmd.php?cmd=id, confirm
that it has apache credentials. After reading the output of ps aux
(http://localhost/cmd.php?cmd=ps aux), i chose one process id of httpd
owned by apache to test. When I try using URL
http://localhost/cmd.php?cmd=strace -p apache_pid 2>/tmp/err, I got
operation not permitted error. The same happen to freebsd box using
ktrace command.
Is this a security feature of apache or what?
Thanks before
- Rizki Wicaksono -
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