TomatoCart 1.x | Cross Site Request Forgery Protection Bypass via JavaScript Hijacking

By YGN Ethical Hacker Group -
1. OVERVIEW

TomatoCart 1.x versions are vulnerable to Cross Site Request Forgery
Protection Bypass.


2. BACKGROUND

TomatoCart is an innovative Open Source shopping cart solution
developed by Wuxi Elootec Technology Co., Ltd. It is forked from
osCommerce 3 as a separate project and is released under the GNU
General Public License V2. Equipped with the web2.0 Technology Ajax
and Rich Internet applications (RIAs), TomatoCart Team is devoted to
building a landmark eCommerce solution.


3. VULNERABILITY DESCRIPTION

TomatoCart 1.x versions contain a flaw related to the script
'/admin/tocdesktop.php' failure to properly protect the JavaScript
object, "token" which is used to prevent Cross Site Request Forgery
attack. This allows an attacker to gain access to the token object via
JavaScript Hijacking upon an administrator user's visit to his crafted
page. Using the compromised token value, the attacker will then be
able to perform administrator-privileged functions such as uploading
file, creating user accounts and so forth.


4. VERSIONS AFFECTED

Tested on 1.x

(Note that we did not verify this issue on upcoming 2.x version -
currently it's on alpha.)


5. PROOF-OF-CONCEPT/EXPLOIT

The following recorded movie will demonstrate how we can leverage the
CSRF-bypass flaw to create an arbitrary shell script.

http://yehg.net/lab/pr0js/training/view/misc/TomatoCart-Anti-CSRF-Bypass-2-Shell/


6. SOLUTION

The vendor did not show commitment in hardening the application.
Workaround is not to visit malicious web sites during login or to use
a dedicated browser for TomatoCart administration.
It is recommended to use alternative shopping cart application with
good track record of security fixes.


7. VENDOR

Wuxi Elootec Technology Co., Ltd.


8. CREDIT

Aung Khant, http://yehg.net, YGN Ethical Hacker Group, Myanmar.


9. DISCLOSURE TIME-LINE

2012-04-22: Contacted the vendor through email
2012-04-29: Vendor replied and the vulnerability information was sent
2013-01-07: Vulnerability not fixed
2013-01-07: Vulnerability disclosed


10. REFERENCES

Original Advisory URL:
http://yehg.net/lab/pr0js/advisories/%5Btomatocart1.x%5D_ant-csrf_bypass
Other TomatoCart Advisory URL:
http://yehg.net/lab/pr0js/advisories/%5Btomatocart1.x%5D_arbitrary_file_creation
Other TomatoCart Advisory URL:
http://yehg.net/lab/pr0js/advisories/%5Btomatocart1.x%5D_vulnerable_piwik
TomatoCart Home Page: http://www.tomatocart.com/

#yehg [2013-01-07]

---------------------------------
Best regards,
YGN Ethical Hacker Group
Yangon, Myanmar
http://yehg.net
Our Lab | http://yehg.net/lab
Our Directory | http://yehg.net/hwd

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