Samba nmbd Buffer Overflow in Processing GETDC mailslot Requests Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1018954
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SecurityTracker URL: http://securitytracker.com/id?1018954
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CVE Reference: CVE-2007-4572
(Links to External Site)
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Date: Nov 15 2007
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Impact: Execution of arbitrary code via network, User access via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): 3.0.0 - 3.0.26a
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Description: A vulnerability was reported in Samba. A remote user can execute arbitrary code on the target system.
A remote user can send specially crafted GETDC mailslot requests to trigger a buffer overflow in nmbd and execute arbitrary code
on the target system. The code will run with the privileges of the target service.
The vendor discovered this vulnerability
on September 13, 2007.
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Impact: A remote user can execute arbitrary code on the target system.
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Solution: The vendor has issued a fixed version (3.0.27).
Also, patches are available at:
http://www.samba.org/samba/security/
The Samba advisory is available at:
http://samba.org/samba/security/CVE-2007-4572.html
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Vendor URL: samba.org/samba/security/CVE-2007-4572.html (Links to External Site)
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Cause: Boundary error
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Underlying OS: Linux (Any), UNIX (Any)
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Reported By: "Gerald (Jerry) Carter" <jerry@samba.org>
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Thu, 15 Nov 2007 07:20:13 -0600
From: "Gerald (Jerry) Carter" <jerry@samba.org>
Subject: [SAMBA] CVE-2007-4572 - GETDC mailslot processing buffer overrun
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
==========================================================
==
== Subject: Stack buffer overflow in nmbd's logon
== request processing.
==
== CVE ID#: CVE-2007-4572
==
== Versions: Samba 3.0.0 - 3.0.26a (inclusive)
==
== Summary: Processing of specially crafted GETDC
== mailslot requests can result in a buffer
== overrun in nmbd. It is not believed that
== that this issues can be exploited to
== result in remote code execution.
==
==========================================================
===========
Description
===========
Samba developers have discovered what is believed to be
a non-exploitable buffer over in nmbd during the processing
of GETDC logon server requests. This code is only used
when the Samba server is configured as a Primary or Backup
Domain Controller.
==================
Patch Availability
==================
A patch addressing this defect has been posted to
http://www.samba.org/samba/security/
Additionally, Samba 3.0.27 has been issued as a security
release to correct the defect.
==========
Workaround
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Samba administrators may avoid this security issue by disabling
both the "domain logons" and the "domain master" options in in
the server's smb.conf file. Note that this will disable all
domain controller features as well.
=======
Credits
=======
This vulnerability was discovered by Samba developers during
an internal code audit.
The time line is as follows:
* Sep 13, 2007: Initial report to security@samba.org including
proposed patch.
* Sep 14, 2007: Patch review by members of the Josh Bressers
(RedHat Security Team) and Simo Sorce (Samba/RedHat developer)
* Nov 15, 2007: Public security advisory made available.
==========================================================
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
==========================================================
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