[ GLSA 200403-08 ] oftpd DoS vulnerability

[Kurt Lieber <klieber () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200403-08
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                                             http://security.gentoo.org
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  Severity: Normal
     Title: oftpd DoS vulnerability
      Date: March 29, 2004
      Bugs: #45738
        ID: 200403-08

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Synopsis
========

A remotely-exploitable overflow exists in oftpd, allowing an attacker
to crash the oftpd daemon.

Background
==========

Quote from http://www.time-travellers.org/oftpd/

"oftpd is designed to be as secure as an anonymous FTP server can
possibly be. It runs as non-root for most of the time, and uses the
Unix chroot() command to hide most of the systems directories from
external users - they cannot change into them even if the server is
totally compromised! It contains its own directory change code, so that
it can run efficiently as a threaded server, and its own directory
listing code (most FTP servers execute the system "ls" command to list
files)."

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

    -------------------------------------------------------------------
     Package        /   Vulnerable   /                      Unaffected
    -------------------------------------------------------------------
     net-ftp/oftpd       <= 0.3.6                             >= 0.3.7

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

Issuing a port command with a number higher than 255 causes the server
to crash. The port command may be issued before any authentication
takes place, meaning the attacker does not need to know a valid
username and password in order to exploit this vulnerability.

Impact
======

This exploit causes a denial of service.

Workaround
==========

While a workaround is not currently known for this issue, all users are
advised to upgrade to the latest version of the affected package.

Resolution
==========

All users should upgrade to the current version of the affected
package:

    # emerge sync

    # emerge -pv ">=net-ftp/oftpd-0.3.7"
    # emerge ">=net-ftp/oftpd-0.3.7"

References
==========

  [ 1 ] http://www.time-travellers.org/oftpd/oftpd-dos.html

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.

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