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Linux Advisory Watch: September 9th 2005 Print E-mail
User Rating:      How can I rate this item?
Source: LinuxSecurity.com Contributors - Posted by Benjamin D. Thomas   
Linux Advisory Watch This week, advisories were released for proftpd, sqwebmail, polygen, affix, zsync, phpgroupware, webcalendar, pcre3, ntp, cvs, kdelibs, evince, openmotif, cman, gnbd-kernel, dlm-kernel, lockdev, perl, termcap, ckermit, kdegraphics, squid, pam, setup, tar, openssh, tzdata, httpd, mplayer, and phpldapadmin. The distributors include Debian, Fedora, Gentoo, and Red Hat.


Master of Science in Information Security - Earn your Master of Science in Information Security online from Norwich University. Designated a "Center of Excellence", the program offers a solid education in the management of information assurance, and the unique case study method melds theory into practice. Using today's e-Learning technology, you can earn this esteemed degree, without disrupting your career or home life.

Introduction: IP Spoofing, Part III - ICMP Smurfing
By: Suhas A Desai

"Smurf" is the name of an automated program that attacks a network by exploiting IP broadcast addressing. Smurf and similar programs can cause the attacked part of a network to become "inoperable." Network nodes and their administrators to exchange information about the state of the network use ICMP.

A smurf program builds a network packet with a spoofed victim source address. The packet contains an ICMP ping message addressed to an IP broadcast address, meaning all IP addresses in a given network. If the routing device delivering traffic to those broadcast addresses performs the IP broadcast to layer 2 broadcast function, most hosts on that IP network will reply to it with an ICMP echo reply each. The echo responses to the ping message are sent back to the victim address. Enough pings and resultant echoes can flood the network making it unusable for real traffic.

A related attack is called "fraggle", simple re-write of smurf; uses UDP echo packets in the same fashion as the ICMP echo packets. The intermediary (broadcast) devices, and the spoofed victim are both hurt by this attack. The attackers rely on the ability to source spoofed packets to the "amplifiers" in order to generate the traffic which causes the denial of service.

In order to stop this, all networks should perform filtering either at the edge of the network where customers connect (access layer) or at the edge of the network with connections to the upstream providers, in order to defeat the possibility of source address spoofed packets from entering from downstream networks, or leaving for upstream networks.

One way to defeat smurfing is to disable IP broadcast addressing at each network router since it is seldom used.

READ ENTIRE ARTICLE:
http://www.linuxsecurity.com/content/view/120225/49/


LinuxSecurity.com Feature Extras:

Linux File & Directory Permissions Mistakes - One common mistake Linux administrators make is having file and directory permissions that are far too liberal and allow access beyond that which is needed for proper system operations. A full explanation of unix file permissions is beyond the scope of this article, so I'll assume you are familiar with the usage of such tools as chmod, chown, and chgrp. If you'd like a refresher, one is available right here on linuxsecurity.com.

Introduction: Buffer Overflow Vulnerabilities - Buffer overflows are a leading type of security vulnerability. This paper explains what a buffer overflow is, how it can be exploited, and what countermeasures can be taken to prevent the use of buffer overflow vulnerabilities.

Getting to Know Linux Security: File Permissions - Welcome to the first tutorial in the 'Getting to Know Linux Security' series. The topic explored is Linux file permissions. It offers an easy to follow explanation of how to read permissions, and how to set them using chmod. This guide is intended for users new to Linux security, therefore very simple. If the feedback is good, I'll consider creating more complex guides for advanced users. Please let us know what you think and how these can be improved.

 

Take advantage of our Linux Security discussion list! This mailing list is for general security-related questions and comments. To subscribe send an e-mail to security-discuss-request@linuxsecurity.com with "subscribe" as the subject.

Thank you for reading the LinuxSecurity.com weekly security newsletter. The purpose of this document is to provide our readers with a quick summary of each week's most relevant Linux security headline.


   Debian
  Debian: New proftpd packages fix format string vulnerability
  1st, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120281
 
  Debian: New sqwebmail packages fix cross-site scripting
  1st, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120273
 
  Debian: New Mozilla Firefox packages fix several vulnerabilities
  1st, September, 2005

Update Package.

http://www.linuxsecurity.com/content/view/120278
 
  Debian: New polygen packages fix denial of service
  1st, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120280
 
  Debian: New affix packages fix remote command execution
  1st, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120282
 
  Debian: New zsync packages fix DOS
  1st, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120283
 
  Debian: New phproupware packages fix several vulnerabilities
  2nd, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120285
 
  Debian: New webcalendar packages fix remote code execution
  2nd, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120287
 
  Debian: New pcre3 packages fix arbitrary code execution
  2nd, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120288
 
  Debian: Updated i386 proftpd packages fix format string vulnerability
  2nd, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120294
 
  Debian: New ntp packages fix group id confusion
  5th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120298
 
  Debian: New cvs packages fix insecure temporary files
  7th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120319
 
  Debian: New Apache packages fix HTTP request smuggling
  8th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120330
 
  Debian: New kdelibs packages fix backup file information leak
  8th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120332
 
   Fedora
  Fedora Core 4 Update: evince-0.4.0-1.2
  1st, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120279
 
  Fedora Core 4 Update: openmotif-2.2.3-10.FC4.1
  2nd, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120289
 
  Fedora Core 4 Update: cman-kernel-2.6.11.5-20050601.152643.FC4.12
  2nd, September, 2005

Rebuild for latest kernel, 2.6.12-1.1447_FC4.

http://www.linuxsecurity.com/content/view/120290
 
  Fedora Core 4 Update: gnbd-kernel-2.6.11.2-20050420.133124.FC4.45
  2nd, September, 2005

Rebuild for latest kernel, 2.6.12-1.1447_FC4.

http://www.linuxsecurity.com/content/view/120291
 
  Fedora Core 4 Update: dlm-kernel-2.6.11.5-20050601.152643.FC4.12
  2nd, September, 2005

Rebuild for latest kernel, 2.6.12-1.1447_FC4.

http://www.linuxsecurity.com/content/view/120292
 
  Fedora Core 4 Update: GFS-kernel-2.6.11.8-20050601.152643.FC4.14
  2nd, September, 2005

Rebuild for latest kernel, 2.6.12-1.1447_FC4.

http://www.linuxsecurity.com/content/view/120293
 
  Fedora Core 4 Update: lockdev-1.0.1-7.1
  2nd, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120295
 
  Fedora Core 3 Update: perl-Compress-Zlib-1.37-1.fc3
  6th, September, 2005

Some bug fixes so the amavis users stop complaining. =)

http://www.linuxsecurity.com/content/view/120303
 
  Fedora Core 4 Update: perl-Compress-Zlib-1.37-1.fc4
  6th, September, 2005

Some bug fixes so the amavis users stop complaining. =)

http://www.linuxsecurity.com/content/view/120304
 
  Fedora Core 3 Update: perl-DBI-1.40-6.fc3
  6th, September, 2005

Old and low priority security update that we forgot to push a while ago.

http://www.linuxsecurity.com/content/view/120305
 
  Fedora Core 4 Update: termcap-5.4-6
  6th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120306
 
  Fedora Core 4 Update: ckermit-8.0.211-3.FC4
  6th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120307
 
  Fedora Core 4 Update: kdegraphics-3.4.2-0.fc4.2
  6th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120308
 
  Fedora Core 4 Update: squid-2.5.STABLE9-8
  6th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120315
 
  Fedora Core 3 Update: squid-2.5.STABLE9-1.FC3.7
  6th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120316
 
  Fedora Core 4 Update: pam-0.79-9.5
  6th, September, 2005

This update should fix potential problems with auditing in pam when used on systems with kernels without audit compiled in.

http://www.linuxsecurity.com/content/view/120317
 
  Fedora Core 4 Update: setup-2.5.44-1.1
  6th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120318
 
  Fedora Core 4 Update: tar-1.15.1-10.FC4
  7th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120323
 
  Fedora Core 3 Update: openssh-3.9p1-8.0.3
  7th, September, 2005

This security update fixes CAN-2005-2798 and resolves a problem with X forwarding binding only on IPv6 address on certain circumstances.

http://www.linuxsecurity.com/content/view/120324
 
  Fedora Core 4 Update: tzdata-2005m-1.fc4
  7th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120325
 
  Fedora Core 3 Update: tzdata-2005m-1.fc3
  7th, September, 2005

Updated package.

http://www.linuxsecurity.com/content/view/120326
 
  Fedora Core 4 Update: httpd-2.0.54-10.2
  7th, September, 2005

This update includes two security fixes. An issue was discovered in mod_ssl where "SSLVerifyClient require" would not be honoured in location context if the virtual host had "SSLVerifyClient optional" configured (CAN-2005-2700).

http://www.linuxsecurity.com/content/view/120327
 
  Fedora Core 3 Update: httpd-2.0.53-3.3
  7th, September, 2005

This update includes two security fixes. An issue was discovered in mod_ssl where "SSLVerifyClientrequire" would not be honoured in location context if the virtual host had "SSLVerifyClient optional" configured (CAN-2005-2700).

http://www.linuxsecurity.com/content/view/120328
 
   Gentoo
  Gentoo: MPlayer Heap overflow in ad_pcm.c
  1st, September, 2005

A heap overflow in MPlayer might lead to the execution of arbitrary code.

http://www.linuxsecurity.com/content/view/120276
 
  Gentoo: Gnumeric Heap overflow in the included PCRE library
  3rd, September, 2005

Gnumeric is vulnerable to a heap overflow, possibly leading to the execution of arbitrary code.

http://www.linuxsecurity.com/content/view/120296
 
  Gentoo: OpenTTD Format string vulnerabilities
  5th, September, 2005

OpenTTD is vulnerable to format string vulnerabilities which may result in remote execution of arbitrary code.

http://www.linuxsecurity.com/content/view/120301
 
  Gentoo: phpLDAPadmin Authentication bypass
  6th, September, 2005

A flaw in phpLDAPadmin may allow attackers to bypass security restrictions and connect anonymously.

http://www.linuxsecurity.com/content/view/120311
 
  Gentoo: Net-SNMP Insecure RPATH
  6th, September, 2005

The Gentoo Net-SNMP package may provide Perl modules containing an insecure DT_RPATH, potentially allowing privilege escalation.

http://www.linuxsecurity.com/content/view/120312
 
  Gentoo: Squid Denial of Service vulnerabilities
  7th, September, 2005

Squid contains several bugs when handling certain malformed requests resulting in a Denial of Service.

http://www.linuxsecurity.com/content/view/120322
 
   Red Hat
  RedHat: Important: httpd security update
  6th, September, 2005

Updated Apache httpd packages that correct two security issues are now available for Red Hat Enterprise Linux 3 and 4. This update has been rated as having important security impact by the Red Hat Security Response Team.

http://www.linuxsecurity.com/content/view/120313
 
  RedHat: Low: cvs security update
  6th, September, 2005

An updated cvs package that fixes a security bug is now available. This update has been rated as having low security impact by the Red Hat Security Response Team.

http://www.linuxsecurity.com/content/view/120314
 

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