bugtraq - [SAMBA-SECURITY] CVE-2007-0452: Potential DoS against smbd in Samba 3.0.6

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Message-ID: <45C7305F.4030007@samba.org>
Date: Mon, 05 Feb 2007 07:25:51 -0600
From: "Gerald (Jerry) Carter" <jerry@...ba.org>
To: bugtraq@...urityfocus.com
Cc: security@...ba.org
Subject: [SAMBA-SECURITY] CVE-2007-0452: Potential DoS against smbd in Samba
 3.0.6 - 3.0.23d

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==========================================================
==
== Subject:     Potential Denial of Service bug in smbd
== CVE ID#:     CVE-2007-0452
==
== Versions:    Samba 3.0.6 - 3.0.23d (inclusive)
==
== Summary:     A logic error in the deferred open code
== 		can lead to an infinite loop in smbd
==
==========================================================

===========
Description
===========

Internally Samba's file server daemon, smbd, implements
support for deferred file open calls in an attempt to serve
client requests that would otherwise fail due to a share mode
violation.  When renaming a file under certain circumstances
it is possible that the request is never removed from the deferred
open queue.  smbd will then become stuck is a loop trying to
service the open request.

This bug may allow an authenticated user to exhaust resources
such as memory and CPU on the server by opening multiple CIFS
sessions, each of which will normally spawn a new smbd process,
and sending each connection into an infinite loop.

==================
Patch Availability
==================

A patch against Samba 3.0.23d has been attached to this
email.  This fix has be incorporated into the Samba 3.0.24
release.  Patches are also available from at the Samba Security
page (http://www.samba.org/samba/security).

==========
Workaround
==========

The bug is believed to be exploitable only by an authenticated
user.  The server's exposure can be alleviated by disabling
any suspect or hostile user accounts.

=======
Credits
=======

This vulnerability was found during internal regression
testing by Samba developers.

==========================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
==========================================================

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View attachment "smbd_deferred_open_v2.patch" of type "text/plain" (6015 bytes)

View attachment "smbd_deferred_open_v2.patch.asc" of type "text/plain" (197 bytes)