[ GLSA 200501-21 ] HylaFAX: hfaxd unauthorized login vulnerability

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200501-21
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: HylaFAX: hfaxd unauthorized login vulnerability
      Date: January 11, 2005
      Bugs: #75941
        ID: 200501-21

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Synopsis
========

HylaFAX is subject to a vulnerability in its username matching code,
potentially allowing remote users to bypass access control lists.

Background
==========

HylaFAX is a software package for sending and receiving facsimile
messages.

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  net-misc/hylafax     < 4.2.0-r2                       >= 4.2.0-r2

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

The code used by hfaxd to match a given username and hostname with an
entry in the hosts.hfaxd file is insufficiently protected against
malicious entries.

Impact
======

If the HylaFAX installation uses a weak hosts.hfaxd file, a remote
attacker could authenticate using a malicious username or hostname and
bypass the intended access restrictions.

Workaround
==========

As a workaround, administrators may consider adding passwords to all
entries in the hosts.hfaxd file.

Resolution
==========

All HylaFAX users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/hylafax-4.2.0-r2"

Note: Due to heightened security, weak entries in the hosts.hfaxd file
may no longer work. Please see the HylaFAX documentation for details of
accepted syntax in the hosts.hfaxd file.

References
==========

  [ 1 ] CAN-2004-1182
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1182
  [ 2 ] HylaFAX Announcement
        http://marc.theaimsgroup.com/?l=hylafax&m=110545119911558&w=2

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

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

  http://security.gentoo.org/glsa/glsa-200501-21.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
=======

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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