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TUCoPS :: Web :: Adminware, Control Panels :: web4930.htm

webmin local file writing



18th Dec 2001 [SBWID-4930]
COMMAND

	webmin local file writing

SYSTEMS AFFECTED

	webmin 0.91

PROBLEM

	A. Ramos found that it is possible  to  write  arbitrary  files  on  the
	server.
	

	With this software you can start and stop  services  with  simple  user,
	and edit init scripts. like this:
	

	http://www.domain.com:10000/servers/link.cgi/1008341480/init/edit_action.cgi?0+makedev

	

	 but you can use this:

	

	http://www.domain.com:10000/servers/link.cgi/1008341480/init/edit_action.cgi?0+../../../../../etc/shadow

	

	

	The problem reside on init/edit_action.cgi:
	

	<snip>

	        open(FILE, $file);

	        while(<FILE>) {

	                $data .= $_;

	                if (/^\\s*([\'\"]?)([a-z]+)\\1\\)/i) {

	                        $hasarg{$2}++;

	                        }

	                }

	        close(FILE);

	</snip>

	

SOLUTION

	If you have ability to edit init script, you won\'t crash  your  system.
	Will you ?
	

	 Workaround 

	 ==========

	

	just patch the regexp...


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