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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Conectiva Issues Fix) Samba Buffer Overflows in Web Administration Tool and in 'hash' Mangling Method May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1010830
SecurityTracker URL:  http://securitytracker.com/id/1010830
CVE Reference:   CAN-2004-0600, CAN-2004-0686   (Links to External Site)
Date:  Jul 31 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.2.10 and also 3.0.0 - 3.0.4
Description:   Two buffer overflow vulnerabilities were reported in Samba, affecting the Samba Web Administration Tool and systems using the 'hash' mangling method. A remote user may be able to execute arbitrary code on the target system.

Evgeny Demidov reported that there is a buffer overflow in the Samba Web Administration Tool (SWAT) in versions 3.0.2 - 3.0.4. A remote user can supply a specially crafted HTTP Basic Authentication header containing an invalid Base64 character to trigger the overflow and execute arbitrary code on the target system [CVE: CAN-2004-0600].

The vendor reported that the affected code is also used to decode LDAP sambaMungedDial attribute values on systems that use the ldapsam passdb backend. Although the vendor believes that this is not exploitable, LDAP users are encouraged to verify that the DIT only allows write access to sambaSamAccount attributes by a sufficiently authorized user.

The vendor was reportedly notified on July 14, 2004.

The vendor discovered a separate buffer overflow in the code that processes the 'mangling method = hash' option from the 'smb.conf' file [CVE: CAN-2004-0686]. Samba versions 3.0.0 and later are affected. The default setting of 'mangling method = hash2' is not vulnerable.
Impact:   A remote user may be able to execute arbitrary code on the target system.
Solution:   Conectiva has released a fix.

ftp://atualizacoes.conectiva.com.br/8/SRPMS/samba-2.2.10-1U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-clients-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-codepagesource-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-common-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-doc-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-swat-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/samba-2.2.10-27520U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-clients-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-codepagesource-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-common-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-devel-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-doc-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-ldap-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-swat-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-vfs-2.2.10-27520U90_1cl.i386.rpm
Vendor URL:  www.samba.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Conectiva)

Message History:   This archive entry is a follow-up to the message listed below.
Jul 22 2004 Samba Buffer Overflows in Web Administration Tool and in 'hash' Mangling Method May Let Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Fri, 30 Jul 2004 11:38:58 -0300
Subject:  [Conectiva-updates] [CLA-2004:854] Conectiva Security Announcement


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : samba
SUMMARY   : Multiple potential buffer overruns
DATE      : 2004-07-30 11:35:00
ID        : CLA-2004:854
RELEVANT
RELEASES  : 8, 9

- -------------------------------------------------------------------------

DESCRIPTION
 Samba[1] provides SMB/CIFS services (such as file and printer
 sharing) used by clients compatible with Microsoft Windows(TM).
 
 Evgeny Demidov noticed that the internal routine used by the Samba
 Web Administration Tool (SWAT) to decode the base64 data during HTTP
 basic authentication is subject[2] to a buffer overrun caused by an
 invalid base64 character.  This same code is used internally to
 decode the sambaMungedDial attribute value when using the ldapsam
 passdb backend and to decode input given to the ntlm_auth tool.
 
 Another buffer overrun problem[3] has been located in the code used
 to support the 'mangling method = hash' smb.conf option. Please be
 aware that the default setting for this parameter is 'mangling method
 = hash2' and therefore not vulnerable.


SOLUTION
 It is recommended that all samba users upgrade their packages. This
 update will automatically restart the service if it is already
 running.
 
 
 REFERENCES
 1.http://www.samba.org/
 2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0600
 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0686


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/SRPMS/samba-2.2.10-1U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-clients-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-codepagesource-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-common-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-doc-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-swat-2.2.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/samba-2.2.10-27520U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-clients-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-codepagesource-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-common-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-devel-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-doc-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-ldap-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-swat-2.2.10-27520U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/samba-vfs-2.2.10-27520U90_1cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions regarding the use of apt and upgrade examples 
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

- -------------------------------------------------------------------------
All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at 
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en

- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

- -------------------------------------------------------------------------
Copyright (c) 2004 Conectiva Inc.
http://www.conectiva.com

- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQFBCl2B42jd0JmAcZARAjrgAKDjX9lnz98upP3l37fASb2th6lmSACgupMO
LeJkjokwfyaJZzMn+74MGyE=
=+jlF
-----END PGP SIGNATURE-----

______________________________________________________________________
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br


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