cgisecurity.com Advisory #5

[zeno <zeno () cgisecurity net>]

Well I had about 3 advisories I was working on but my HD died
and this was the only thing I could salvage. The vendor's patch
is also contained below in a url.


- zenomorph




                               [ Cgi Security Advisory #5 ]
                                  admin () cgisecurity com
                                 VirtualCart Shopping Cart

Found
April 2001


Public release
June 2001


Vendor Contacted:
April 2001


Script Effected: VirtualCart Shopping Cart
Price: $199.00 for a single user license


Versions:
All versions appear to be effected


Platforms:
Unix, Linux, NT


Vendor:
http://www.vcart.com


Vendor Patch:
http://www.cgisecurity.net/advisory/patch/VirtualCatalog.tar.gz



1. Problem

The problem lies in a file called CatalogMgr.pl.
The template variable does no validation checking and due to this
remote command execution is possible as the uid of the webserver.
(Usually user www or nobody)


The following request listed below would allow grabbing of the scripts
own sourcecode.

http://host/cgi-bin/CatalogMgr.pl?cartID=<valid-id>&template=CatalogMgr.pl
(Note: Paths may vary)



2. Fixes

The vendor has been contacted about this security issue.
Check the vendor webpage for futher updates or use the
vendor patch provided above towards the top of this advisory.

One quick solution to fix the remote command execution would be to put this
script into "Taint mode". This is done my modifying the path to perl at the
very top of this script. Simply change #!/usr/bin/perl to #!/usr/bin/perl -T.

It is also noted that the vendor found 3 other holes after we contacted them
and the patch above fixes those holes as well.



Published to the Public June 2001
Copyright May 2001 Cgisecurity.com