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UNIRAS Brief - 500/04 - Gentoo - Security Advisories: Multiple vulnerabilities in Usermin & Samba: Denial of Service vulnerabilities
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UNIRAS (UK Govt CERT) Briefing Notice - 500/04 dated 14.09.04 Time: 14:11
UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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UNIRAS material is also available from its website at www.uniras.gov.uk and
Information about NISCC is available from www.niscc.gov.uk
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Title
=====
Gentoo Security Advisories:
Webmin, Usermin: Multiple vulnerabilities in Usermin
Samba: Denial of Service vulnerabilities
Detail
======
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Gentoo Linux Security Advisory GLSA 200409-15
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http://security.gentoo.org/
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Severity: Normal
Title: Webmin, Usermin: Multiple vulnerabilities in Usermin
Date: September 12, 2004
Bugs: #63167
ID: 200409-15
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Synopsis
========
A vulnerability in the webmail function of Usermin could be used by an
attacker to execute shell code via a specially-crafted e-mail. A bug in
the installation script of Webmin and Usermin also allows a local user
to execute a symlink attack at installation time.
Background
==========
Webmin and Usermin are web-based system administration consoles. Webmin
allows an administrator to easily configure servers and other features.
Usermin allows users to configure their own accounts, execute commands,
and read e-mail. The Usermin functionality, including webmail, is also
included in Webmin.
Affected packages
=================
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Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-admin/usermin < 1.090 >= 1.090
2 app-admin/webmin < 1.160 >= 1.160
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2 affected packages on all of their supported architectures.
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Description
===========
There is an input validation bug in the webmail feature of Usermin.
Additionally, the Webmin and Usermin installation scripts write to
/tmp/.webmin without properly checking if it exists first.
Impact
======
The first vulnerability allows a remote attacker to inject arbitrary
shell code in a specially-crafted e-mail. This could lead to remote
code execution with the privileges of the user running Webmin or
Usermin.
The second could allow local users who know Webmin or Usermin is going
to be installed to have arbitrary files be overwritten by creating a
symlink by the name /tmp/.webmin that points to some target file,
e.g. /etc/passwd.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All Usermin users should upgrade to the latest version:
# emerge sync
# emerge -pv ">=app-admin/usermin-1.090"
# emerge ">=app-admin/usermin-1.090"
All Webmin users should upgrade to the latest version:
# emerge sync
# emerge -pv ">=app-admin/webmin-1.160"
# emerge ">=app-admin/webmin-1.160"
References
==========
[ 1 ] Secunia Advisory SA12488
http://secunia.com/advisories/12488/
[ 2 ] Usermin Changelog
http://www.webmin.com/uchanges.html
Availability
============
This GLSA and any updates to it are available for viewing at the Gentoo
Security Website:
http://security.gentoo.org/glsa/glsa-200409-15.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@xxxxxxxxxx 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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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
=================
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Package / Vulnerable / Unaffected
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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@xxxxxxxxxx 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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For additional information or assistance, please contact the HELP Desk by
telephone or Not Protectively Marked information may be sent via
EMail to: uniras@xxxxxxxxxxxx
Office Hours:
Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 870 487 0748 Ext 4511
Fax: +44 (0) 870 487 0749
Outside of Office Hours:
On Call Duty Officer:
Tel: +44 (0) 870 487 0748 and follow the prompts
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UNIRAS wishes to acknowledge the contributions of Gentoo Foundation, Inc for the
information contained in this Briefing.
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This Briefing contains the information released by the original author. Some
of the information may have changed since it was released. If the vulnerability
affects you, it may be prudent to retrieve the advisory from the canonical site
to ensure that you receive the most current information concerning that problem.
Reference to any specific commercial product, process, or service by trade
name, trademark manufacturer, or otherwise, does not constitute or imply
its endorsement, recommendation, or favouring by UNIRAS or NISCC. The views
and opinions of authors expressed within this notice shall not be used for
advertising or product endorsement purposes.
Neither UNIRAS or NISCC shall also accept responsibility for any errors
or omissions contained within this briefing notice. In particular, they shall
not be liable for any loss or damage whatsoever, arising from or in connection
with the usage of information contained within this notice.
UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST)
and has contacts with other international Incident Response Teams (IRTs) in
order to foster cooperation and coordination in incident prevention, to prompt
rapid reaction to incidents, and to promote information sharing amongst its
members and the community at large.
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<End of UNIRAS Briefing>
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