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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 >> Denial of Service >> MDaemon DoS

Vulnerability Assessment Details

MDaemon DoS

Vulnerability Assessment Summary
Crashes the remote MTA

Detailed Explanation for this Vulnerability Assessment

It was possible to crash the remote SMTP server
by opening a great amount of sockets on it.

This problem permits a possible hacker to make your
SMTP server crash, thus preventing you
from sending or receiving e-mails, which
will affect your work.

*** Note that due to the nature of this vulnerability,
*** Nessus can not be 100% positive on the effectiveness of
*** this flaw. As a result, this report might be a false positive

Solution :
If your SMTP server is constrained to a maximum
number of processes, i.e. it's not running as
root and as a ulimit 'max user processes' of
256, you may consider upping the limit with 'ulimit -u'.

If your server has the ability to protect itself from
SYN floods, you should turn on that features, i.e. Linux's CONFIG_SYN_COOKIES

The best solution may be Cisco's 'TCP intercept' feature.

Network Security Threat Level: High

Networks Security ID: 8554

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

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