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Category:   Application (File Transfer/Sharing)  >   oftpd Vendors:   Kerr, Shane et al
(Gentoo Issues Fix) oftpd Can Be Crashed By Remote Users Sending a PORT Command
SecurityTracker Alert ID:  1009589
SecurityTracker URL:  http://securitytracker.com/id/1009589
CVE Reference:   CVE-2004-0376   (Links to External Site)
Updated:  Apr 4 2004
Original Entry Date:  Mar 29 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.3.6
Description:   A denial of service vulnerability was reported in oftpd. A remote user can cause the server to crash.

Philippe Oechslin reported that a remote user can cause the FTP service to crash by sending an FTP PORT command with a port number higher than 255. The oftpd daemon will then crash and must be manually restarted to return to normal operations.

As a demonstration exploit, the report indicates that you can telnet to the target FTP service on TCP port 21 and then type "port 300" with a return to cause the FTP service to crash.

Andreas Rueegg and Philippe Oechslin of the Security Bug Catcher project (http://lasecwww.epfl.ch/philippe.shtml) are credited with discovery.

Impact:   A remote user can cause the oftpd daemon to crash. The daemon must be manually restarted to return to normal operations.
Solution:   Gentoo has released a fix and recommends that all users 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"

Vendor URL:  www.time-travellers.org/oftpd/oftpd-dos.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 29 2004 oftpd Can Be Crashed By Remote Users Sending a PORT Command



 Source Message Contents

Subject:  [gentoo-announce] [ GLSA 200403-08 ] oftpd DoS vulnerability



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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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