nullmailer non-existent user denial of service

nullmailer-nonexistent-user-dos (10649) The risk level is classified as MediumMedium Risk


nullmailer is vulnerable to a denial of service attack. A local attacker could send a mail message to a non-existent user to stop the delivery of all mail on the system.


Denial of Service


For Debian GNU/Linux:
Upgrade to the latest nullmailer package, as listed below. Refer to DSA-198-1 for more information. See References.

Debian GNU/Linux 3.0 (woody): 1.00RC5-16.1woody2 or later


  • Untroubled Web site: Index of nullmailer.
  • BID-6193: Nullmailer Invalid User Denial Of Service Vulnerability
  • CVE-2002-1313: nullmailer 1.00RC5 and earlier allows local users to cause a denial of service via an email to a local user that does not exist, which generates an error that causes nullmailer to stop sending mail to all users.
  • DSA-198: nullmailer -- denial of service
  • OSVDB ID: 14522: nullmailer Local Nonexistent User Mail DoS

Platforms Affected:

  • Debian Debian Linux 3.0
  • untroubled nullmailer


Nov 18, 2002

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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