[ GLSA 200405-09 ] ProFTPD Access Control List bypass vulnerability

[Kurt Lieber <klieber () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200405-09
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                                            http://security.gentoo.org/
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  Severity: High
     Title: ProFTPD Access Control List bypass vulnerability
      Date: May 19, 2004
      Bugs: #49496
        ID: 200405-09

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Synopsis
========

Version 1.2.9 of ProFTPD introduced a vulnerability that causes
CIDR-based Access Control Lists (ACLs) to be treated as "AllowAll",
thereby allowing remote users full access to files available to the
FTP daemon.

Background
==========

ProFTPD is an FTP daemon.

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

    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  net-ftp/proftpd      == 1.2.9-r1                      >= 1.2.9-r2
  1  net-ftp/proftpd      == 1.2.9                         >= 1.2.9-r2

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

ProFTPD 1.2.9 introduced a vulnerability that allows CIDR-based ACLs
(such as 10.0.0.1/24) to be bypassed. The CIDR ACLs are disregarded,
with the net effect being similar to an "AllowAll" directive.

Impact
======

This vulnerability may allow unauthorized files, including critical
system files to be downloaded and/or modified, thereby allowing a
potential remote compromise of the server.

Workaround
==========

Users may work around the problem by avoiding use of CIDR-based ACLs.

Resolution
==========

ProFTPD users are encouraged to upgrade to the latest version of the
package:

    # emerge sync

    # emerge -pv ">=net-ftp/proftpd-1.2.9-r2"
    # emerge ">=net-ftp/proftpd-1.2.9-r2"

References
==========

  [ 1 ] CAN-2004-0432
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0432

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

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

     http://security.gentoo.org/glsa/glsa-200405-09.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 2004 Gentoo Technologies, 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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