LinuxSecurity.com
Share your story
The central voice for Linux and Open Source security news
Home News Topics Advisories HOWTOs Features Newsletters About Register

Welcome!
Sign up!
EnGarde Community
Login
Polls
What is the most important Linux security technology?
 
Advisories
Community
Linux Events
Linux User Groups
Link to Us
Security Center
Book Reviews
Security Dictionary
Security Tips
SELinux
White Papers
Featured Blogs
All About Linux
DanWalsh LiveJournal
Securitydistro
Latest Newsletters
Linux Advisory Watch: December 12th, 2014
Linux Security Week: December 9th, 2014
Subscribe
LinuxSecurity Newsletters
E-mail:
Choose Lists:
About our Newsletters
RSS Feeds
Get the LinuxSecurity news you want faster with RSS
Powered By

  
Red Hat: FTP 'iptables' vulnerability Print E-mail
User Rating:      How can I rate this item?
Posted by LinuxSecurity.com Team   
RedHat Linux A security hole has been found that does not affect the default configuration of Red Hat Linux, but can affect some custom configurations of Red Hat Linux 7.1 only. The bug is specific to the Linux 2.4 kernel series.

---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          FTP iptables vulnerability in 2.4 kernel
Advisory ID:       RHSA-2001:052-02
Issue date:        2001-04-19
Updated on:        2001-04-19
Product:           Red Hat Linux
Keywords:          FTP iptables ip_conntrack_ftp
Cross references:  
Obsoletes:         
---------------------------------------------------------------------

1. Topic:

A security hole has been found that does not affect the default
configuration of Red Hat Linux, but can affect some custom
configurations of Red Hat Linux 7.1 only.  The bug is specific
to the Linux 2.4 kernel series.

2. Relevant releases/architectures:



3. Problem description:

A vulnerability in iptables "RELATED" connection tracking has been
discovered.  When using iptables to allow FTP "RELATED" connections
through the firewall, carefully constructed PORT commands can open
arbitrary holes in the firewall.

The iptables system is included in the 2.4 kernel series, but not in
the earlier 2.2 kernel series used in Red Hat Linux 6.x and Red Hat
Linux 7.0.

Red Hat Linux 7.1 uses a 2.4 kernel and provides the ip_conntrack_ftp
module that has this bug.  However, Red Hat Linux does not currently
configure iptables (the default firewall configuration uses ipchains
instead), so unless you have explicitly configured iptables and
enabled FTP "RELATED" connections through the firewall, you are not
vulnerable to attack.

4. Solution:

Red Hat will be releasing a kernel with this and other bugs fixed
shortly.  In the meantime, we strongly recommend that users of
iptables not allow FTP "RELATED" connections.

5. Bug IDs fixed  (http://bugzilla.Red Hat.com/bugzilla for more info):



6. RPMs required:



7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------


These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
     http://www.Red Hat.com/corp/contact.html

You can verify each package with the following command:
    rpm --checksig  

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg 

8. References:
 
http://www.tempest.com.br/advisories/01-2001.html 
http://www.securityfocus.com/templates/archive.pike?list=1&mid=177070 
http://slashdot.org/comments.pl?sid=01/04/19/047249&cid=36


Copyright(c) 2000, 2001 Red Hat, Inc.


 
< Prev   Next >
    
Partner

 

Latest Features
Peter Smith Releases Linux Network Security Online
Securing a Linux Web Server
Password guessing with Medusa 2.0
Password guessing as an attack vector
Squid and Digest Authentication
Squid and Basic Authentication
Demystifying the Chinese Hacking Industry: Earning 6 Million a Night
Free Online security course (LearnSIA) - A Call for Help
What You Need to Know About Linux Rootkits
Review: A Practical Guide to Fedora and Red Hat Enterprise Linux - Fifth Edition
Yesterday's Edition
The Difference Between Wi-Fi Security Protocols: WPA2-AES vs WPA2-TKIP
Segmenting for security: Five steps to protect your network
Partner Sponsor

Community | HOWTOs | Blogs | Features | Book Reviews | Networking
 Security Projects |  Latest News |  Newsletters |  SELinux |  Privacy |  Home
 Hardening |   About Us |   Advertise |   Legal Notice |   RSS |   Guardian Digital
(c)Copyright 2014 Guardian Digital, Inc. All rights reserved.