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Test Kennung:
Kategorie:Denial of Service
Titel:MDaemon DoS

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

This problem allows an attacker 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.

Risk factor : High

Querverweis: BugTraq ID: 8554
Common Vulnerability Exposure (CVE) ID: CVE-1999-0846
Bugtraq: 19991129 MDaemon 2.7 J DoS (Google Search)
Bugtraq: 19991130 Fwd: RE: Multiples Remotes DoS Attacks in MDaemon Server v2.8.5.0 Vulnerability (Google Search)
CopyrightThis script is Copyright (C) 1999 Renaud Deraison

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