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

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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_at_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