Bug 225519

Summary:	CVE-2007-0452 Samba smbd denial of service
Product:	Red Hat Enterprise Linux 5	Reporter:	Josh Bressers <bressers>
Component:	samba	Assignee:	Simo Sorce <ssorce>
Status:	CLOSED ERRATA	QA Contact:	David Lawrence <dkl>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.0	CC:	jplans, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:	reported=20070130,source=samba,impact=moderate,embargo=20070205
Fixed In Version:	RHSA-2007-0061	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-03-14 14:58:13 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Josh Bressers 2007-01-31 02:13:44 UTC

+++ This bug was initially created as a clone of Bug #225513 +++

A bug has been found in Samba that can allow an authenticated user to cause a
child smbd process to enter an infinite loop.  The definition is rather
complicated so I'm going to paste the description from the upstream Samba advisory:

    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.

-- Additional comment from bressers on 2007-01-30 19:33 EST --
Created an attachment (id=146985)
Proposed upstream patch

Comment 2 Josh Bressers 2007-02-05 19:51:53 UTC

This flaw is now public:
http://us1.samba.org/samba/security/CVE-2007-0452.html

Comment 9 Red Hat Bugzilla 2007-03-14 14:58:13 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2007-0061.html