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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


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Vulnerability Assessment Details

EXPN overflow

Vulnerability Assessment Summary
EXPN and VRFY checks

Detailed Explanation for this Vulnerability Assessment

It was possible to make the remote mail server
crash when issuing a too long argument to the
EXPN command.

A possible hacker may use this flaw to prevent your organization from
receiving any mail, or to force your mail to go through another
mail server, noted as an MX.

Solution : upgrade your mail server or contact your vendor for a fix
Network Security Threat Level: High

Networks Security ID: 2412, 223

Vulnerability Assessment Copyright: This script is Copyright (C) 2001 Renaud Deraison

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