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[ GLSA 200512-02 ] Webmin, Usermin: Format string vulnerability
From: Sune Kloppenborg Jeppesen <jaervosz () gentoo org>
Date: Wed, 7 Dec 2005 21:19:26 +0100

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Gentoo Linux Security Advisory                           GLSA 200512-02
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Webmin, Usermin: Format string vulnerability
      Date: December 07, 2005
      Bugs: #113888
        ID: 200512-02

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Synopsis
========

Webmin and Usermin are vulnerable to a format string vulnerability
which may lead to the execution of arbitrary code.

Background
==========

Webmin is a web-based interface for Unix-like systems. Usermin is a
simplified version of Webmin designed for use by normal users rather
than system administrators.

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  app-admin/webmin        < 1.250                          >= 1.250
  2  app-admin/usermin       < 1.180                          >= 1.180
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Jack Louis discovered that the Webmin and Usermin "miniserv.pl" web
server component is vulnerable to a Perl format string vulnerability.
Login with the supplied username is logged via the Perl "syslog"
facility in an unsafe manner.

Impact
======

A remote attacker can trigger this vulnerability via a specially
crafted username containing format string data. This can be exploited
to consume a large amount of CPU and memory resources on a vulnerable
system, and possibly to execute arbitrary code of the attacker's choice
with the permissions of the user running Webmin.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Webmin users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-admin/webmin-1.250"

All Usermin users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-admin/usermin-1.180"

References
==========

  [ 1 ] CVE-2005-3912
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3912
  [ 2 ] Dyad Security Advisory
        http://www.dyadsecurity.com/webmin-0001.html

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

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

  http://security.gentoo.org/glsa/glsa-200512-02.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
=======

Copyright 2005 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/2.0

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