nullmailer non-existent user denial of service

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

Description:

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.


Consequences:

Denial of Service

Remedy:

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

References:

  • 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

Reported:

Nov 18, 2002

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