full-disclosure - [ GLSA 200409-16 ] Samba: Denial of Service vulnerabilities

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From: jaervosz at gentoo.org (Sune Kloppenborg Jeppesen)
Subject: [ GLSA 200409-16 ] Samba: Denial of Service vulnerabilities

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Gentoo Linux Security Advisory                           GLSA 200409-16
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Samba: Denial of Service vulnerabilities
      Date: September 13, 2004
        ID: 200409-16

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Synopsis
========

Two Denial of Service vulnerabilities have been found and fixed in
Samba.

Background
==========

Samba is a freely available SMB/CIFS implementation which allows
seamless interoperability of file and print services to other SMB/CIFS
clients. smbd and nmbd are two daemons used by the Samba server.

Affected packages
=================

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  net-fs/samba       < 3.0.7                               >= 3.0.7
                                                                 < 3.0

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

There is a defect in smbd's ASN.1 parsing. A bad packet received during
the authentication request could throw newly-spawned smbd processes
into an infinite loop (CAN-2004-0807). Another defect was found in
nmbd's processing of mailslot packets, where a bad NetBIOS request
could crash the nmbd process (CAN-2004-0808).

Impact
======

A remote attacker could send specially crafted packets to trigger both
defects. The ASN.1 parsing issue can be exploited to exhaust all
available memory on the Samba host, potentially denying all service to
that server. The nmbd issue can be exploited to crash the nmbd process,
resulting in a Denial of Service condition on the Samba server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Samba 3.x users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-fs/samba-3.0.7"
    # emerge ">=net-fs/samba-3.0.7"

References
==========

  [ 1 ] CAN-2004-0807
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0807
  [ 2 ] CAN-2004-0808
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0808

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200409-16.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0
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