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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.


Home >> Browse Vulnerability Assessment Database >> SMTP problems >> HELO overflow


Vulnerability Assessment Details

HELO overflow

Vulnerability Assessment Summary
Checks if the remote mail server can be used to send anonymous mail

Detailed Explanation for this Vulnerability Assessment

The remote SMTP server seems to permit remote users to
send mail anonymously by providing arguments that are
too long to the HELO command (more than 1024 chars).

This problem may permit malicious users to send hate
mail or threatening mail using your server,
and keep their anonymity.

Network Security Threat Level: Low

Solution : If you are using sendmail, upgrade to
version 8.9.x or newer. If you do not run sendmail, contact
your vendor.

Networks Security ID: 61, 62

Vulnerability Assessment Copyright: This script is Copyright (C) 1999 Renaud Deraison

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