GLSA 200407-21: Samba: Multiple buffer overflows

Posted by Philipp Esselbach on: 07/29/2004 08:28 AM [ Print | 0 comment(s) ]

A Samba update is available for Gentoo Linux

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Gentoo Linux Security Advisory GLSA 200407-21
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http://security.gentoo.org/
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Severity: High
Title: Samba: Multiple buffer overflows
Date: July 29, 2004
Bugs: #57962
ID: 200407-21

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Synopsis
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Two buffer overflows vulnerabilities were found in Samba, potentially allowing the remote execution of arbitrary code.

Background
=========

Samba is a package which allows *nix systems to act as file servers for Windows computers. It also allows *nix systems to mount shares exported by a Samba/CIFS/Windows server. The Samba Web Administration Tool (SWAT) is a web-based configuration tool part of the Samba package.

Affected packages
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Package / Vulnerable / Unaffected
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1 net-fs/samba >= 3.0.5 <= 3.0.4-r1

Description
==========

Evgeny Demidov found a buffer overflow in SWAT, located in the base64 data decoder used to handle HTTP basic authentication (CAN-2004-0600). The same flaw is present in the code used to handle the sambaMungedDial attribute value, when using the ldapsam passdb backend. Another buffer overflow was found in the code used to support the 'mangling method hash' smb.conf option (CAN-2004-0686). Note that the default Samba value for this option is 'mangling method = hash2' which is not vulnerable.

Impact
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The SWAT authentication overflow could be exploited to execute arbitrary code with the rights of the Samba daemon process. The overflow in the sambaMungedDial handling code is not thought to be exploitable. The buffer overflow in 'mangling method = hash' code could also be used to execute arbitrary code on vulnerable configurations.

Workaround
=========

Users disabling SWAT, not using ldapsam passdb backends and not using the 'mangling method = hash' option are not vulnerable.

Resolution
=========

All Samba users should upgrade to the latest version:

# emerge sync

# emerge -pv ">=net-fs/samba-3.0.5"
# emerge ">=net-fs/samba-3.0.5"

References
=========

[ 1 ] Samba 3.0.5 Release Notes
http://www.samba.org/samba/whatsnew/samba-3.0.5.html
[ 2 ] CAN-2004-0600
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0600
[ 3 ] CAN-2004-0686
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0686

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

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

http://security.gentoo.org/glsa/glsa-200407-21.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@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.

License
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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