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

Sign up!
EnGarde Community
What is the most important Linux security technology?
Linux Events
Linux User Groups
Link to Us
Security Center
Book Reviews
Security Dictionary
Security Tips
White Papers
Featured Blogs
All About Linux
DanWalsh LiveJournal
Latest Newsletters
Linux Security Week: March 23rd, 2015
Linux Advisory Watch: March 20th, 2015
LinuxSecurity Newsletters
Choose Lists:
About our Newsletters
RSS Feeds
Get the LinuxSecurity news you want faster with RSS
Powered By

Debian: 'nullmailer' Denial of Service Print E-mail
User Rating:      How can I rate this item?
Posted by Team   
Debian When a mail is to be delivered locally to a user that doesn'texist, nullmailer tries to deliver it, discovers a user unknown errorand stops delivering. Unfortunately, it stops delivering entirely,not only this mail.

Debian Security Advisory DSA 198-1                                        Martin Schulze
November 18th, 2002            

Package        : nullmailer
Vulnerability  : denial of service
Problem-type   : local
Debian-specific: no

A problem has been discovered in nullmailer, a simple relay-only mail
transport agent for hosts that relay mail to a fixed set of smart
relays.  When a mail is to be delivered locally to a user that doesn't
exist, nullmailer tries to deliver it, discovers a user unknown error
and stops delivering.  Unfortunately, it stops delivering entirely,
not only this mail.  Hence, it's very easy to craft a denial of service.

This problem has been fixed in version 1.00RC5-16.1woody2 for the
current stable distribution (woody) and in version 1.00RC5-17 for the
unstable distribution (sid).  The old stable distribution (potato)
does not contain a nullmailer package.

We recommend that you upgrade your nullmailer package.

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 3.0 alias woody

  Source archives:
      Size/MD5 checksum:      602 39d11580de5a781c1cadf6d422164d8c
      Size/MD5 checksum:     6298 179e56c04af207b19ff020f66b580419
      Size/MD5 checksum:   111691 61041ff5b1e41f9280d63a04c3383144

  Alpha architecture:
      Size/MD5 checksum:   103944 e46443575ae0a0d55475423b1e31bdeb

  ARM architecture:
      Size/MD5 checksum:    70804 2feab48d3941330c03f00567488831f5

  Intel IA-32 architecture:
      Size/MD5 checksum:    68558 ec8e1b3f33bc436897358c80a6f43b3c

  Intel IA-64 architecture:
      Size/MD5 checksum:   144246 c508c104d7b775e84641aabdc2adf209

  HP Precision architecture:
      Size/MD5 checksum:    88306 87b75f52b7ae1e8bdab2a121b79492bd

  Motorola 680x0 architecture:
      Size/MD5 checksum:    67616 29f83614261e229bff40b1c54b12fa3b

  Big endian MIPS architecture:
      Size/MD5 checksum:   102682 91e6a2aabc65fb2b430619dc625a6485

  Little endian MIPS architecture:
      Size/MD5 checksum:   101292 83745fe1ea40cdefb298e2d55f1e0a2b

  PowerPC architecture:
      Size/MD5 checksum:    73996 81bbf1beb5a46a08405d1e4535b4ae44

  IBM S/390 architecture:
      Size/MD5 checksum:    72914 3e5608138030d4577e14e0f17144a2ff

  Sun Sparc architecture:
      Size/MD5 checksum:    73748 cb947e14ce9c2803d55f959d4f03f454

  These files will probably be moved into the stable distribution on
  its next revision.

Survey on the use of Debian GNU/Linux 2.2 alias potato:

For apt-get: deb stable/updates main
For dpkg-ftp: dists/stable/updates/main
Mailing list:
Package info: `apt-cache show ' and

< Prev   Next >


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
Tech Companies, Privacy Advocates Call for NSA Reform
Google warns of unauthorized TLS certificates trusted by almost all OSes
How Kevin Mitnick hacked the audience at CeBIT 2015
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 2015 Guardian Digital, Inc. All rights reserved.