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From Rob Brown <...@direct-connect.com>
Subject config/2811: Authentication Hole
Date Fri, 07 Aug 1998 23:31:41 GMT

>Number:         2811
>Category:       config
>Synopsis:       Authentication Hole
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Fri Aug  7 16:40:00 PDT 1998
>Originator:     rob@direct-connect.com
>Release:        1.2b8 to current
SunOS 5.6 Generic_105182-06 i86pc i386 i86pc
version 2.8.0
I believe the bug exists on many OS and Versions
Apache web server allows access to CGI execution
even if under AuthConfig-AuthUserFile-Limit-require
thing for malicious clients.
Oh easy, just try my configuration out on our developmental server:

Use any normal browser and try this

Notice how it yanks up a Authentication box for
username and password login.  (I've installed an
access of user=rob and pass=rob for your testing.)
That's a good thing.  But now try this from a shell:

% telnet dev.direct-connect.com 80
Connected to dev.direct-connect.com.
Escape character is '^]'.
TEST /cgi-bin/private/access.cgi HTTP/1.0

Do NOT enter any "Authorization: Basic"
uuencoded garbage.  And bamn! it lets
you right in if you type any request
method besides "GET" or "POST"

This is how to make the configuration:

Just have this entry in your access.conf file:

<Directory /usr/local/etc/httpd/cgi-bin>
AllowOverride FileInfo AuthConfig
Options None

Put these files into /usr/local/etc/httpd/cgi-bin/private/

AuthType Basic
AuthUserFile /usr/local/etc/httpd/cgi-bin/private/.htpasswd
<Limit GET POST>
require valid-user


print "Content-type: text/html\n\n";
print "<h1>Congratulations!</h1>\n";
print "CGI is running just fine.<pre>\n";
foreach (keys %ENV)
{print "ENV[$_]=\"$ENV{$_}\"\n";}
and chmod 755 access.cgi of course.

I found this out accidently from a bug in Netscape 4.5b1
when I had many windows open and something caused it to
submit a "HOST" method instead of a "POST" method and it
gave me total access to a protected site without me using
any username or password.  I did some debugging on your
apache server and found out this is what was happening.
I have since closed all these Netscape windows and
tried it again and could not duplicate that bug.  But
I can ALWAYS duplicate this bug on the Apache Server.
Obviously this security hole is the fault of the
Apache server, not a client bug.  This made me mad
because the protected site was on my Apache server
and I don't want people snooping around on my
server unless they are authorized.
Yes, simply report
"501 Method not implemented"
for clients attempting to access a CGI with a method
that is not exactly either "GET" or "POST"
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