User Identity Spoofing in Bitrix Site Manager

[High-Tech Bridge Security Research <advisory@xxxxxxxxxxxx>]

Advisory ID: HTB23183
Product: Bitrix Site Manager
Vendor: Bitrix, Inc
Vulnerable Version(s): 12.5.13 and probably prior
Tested Version: 12.5.13
Advisory Publication:  November 6, 2013  [without technical details]
Vendor Notification: November 6, 2013 
Vendor Patch: November 12, 2013 
Public Disclosure: December 11, 2013 
Vulnerability Type: Insufficient Verification of Data Authenticity [CWE-345]
CVE Reference: CVE-2013-6788
Risk Level: Medium 
CVSSv2 Base Score: 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( 
https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in Bitrix Site 
Manager, which can be exploited to spoof user's identity and read, modify or 
delete pre-ordered items in customer's basket. 


1) User Identity Spoofing in Bitrix Site Manager: CVE-2013-6788

The vulnerability exists due to insufficient verification of supplied data 
authenticity when displaying pre-order items in customer's basket in the 
e-Store Module of Bitrix Site Manager. A remote unauthenticated user can change 
"BITRIX_SM_SALE_UID" cookie, view another user's basket and perform certain 
actions, e.g. add or delete items in the basket. The e-Store Module must be 
installed on the system and knowledge of a valid "BITRIX_SM_SALE_UID" cookie is 
required. This value can be easily guessed using simple brute-force techniques, 
since the application increases its value by 1 with every new customer. 

Below are exploitation instructions for this vulnerability. You will need to 
open two different browsers with plugins that allow cookie management.

1. Open your first browser
2. Visit the following URL http://[host]/buy/cms.php and add items to the 
basket.
3. You will be redirected to the following URL: http://[host]/personal/cart.php 
4. Record your "BITRIX_SM_SALE_UID" cookie value.
5. Open your second browser and navigate to the following URL: 
http://[host]/personal/cart.php
6. Change the value of your "BITRIX_SM_SALE_UID" cookie to the one you recorded 
before and delete all other cookies.
7. Refresh the page http://[host]/personal/cart.php. You will see pre-ordered 
items of another user.

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Solution:

Update "sale" module to version 14.0.1

More Information:
http://www.bitrixsoft.com/products/cms/versions.php?module=sale

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References:

[1] High-Tech Bridge Advisory HTB23183 - User Identity Spoofing in Bitrix Site 
Manager
[2] Bitrix Site Manager - http://www.bitrixsoft.com/products/cms/index.php - 
With over 60,000 installations and #3 rating in the list of the most popular 
commercial CMS worldwide, the software is an ultimate choice for corporate 
portals, online stores, community sites and news services.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - 
international in scope and free for public use, CVE® is a dictionary of 
publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to 
developers and security practitioners, CWE is a formal list of software 
weakness types.
[5] ImmuniWeb® - http://www.htbridge.com/immuniweb/ - is High-Tech Bridge's 
proprietary web application security assessment solution with SaaS delivery 
model that combines manual and automated vulnerability testing.

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Disclaimer: The information provided in this Advisory is provided "as is" and 
without any warranty of any kind. Details of this Advisory may be updated in 
order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.