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MGC ALERT 2016-004
- Original release date: May 28, 2016
- Last revised:  June 1, 2016
- Discovered by: Manuel Garcia Cardenas
- Severity: 4,8/10 (CVSS Base Score)
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I. VULNERABILITY
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Reflected XSS in CMSimple <= v4.6.2

II. BACKGROUND
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CMSimple is a php based Content Managemant System (CMS) , which requires no
database. All data are stored in a simple file system.

III. DESCRIPTION
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Has been detected a reflected XSS vulnerability in Admin Panel of CMSimple,
that allows the execution of arbitrary HTML/script code to be executed in
the context of the victim user's browser.

The code injection is done through the parameter "subdir" in the page
"userfiles".

IV. PROOF OF CONCEPT
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Malicious Request:
/cmsimple/?userfiles&subdir=userfiles/<XSS injection>

Example:
/cmsimple/?userfiles&subdir=userfiles/<script>alert(1)</script>

V. BUSINESS IMPACT
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An attacker can execute arbitrary HTML or script code in a targeted user's
browser, this can leverage to steal sensitive information as user
credentials, personal data, etc.

VI. SYSTEMS AFFECTED
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CMSimple <= v4.6.2

VII. SOLUTION
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Update to version 4.6.3

VIII. REFERENCES
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http://www.cmsimple.org/

IX. CREDITS
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This vulnerability has been discovered and reported
by Manuel Garcia Cardenas (advidsec (at) gmail (dot) com).

X. REVISION HISTORY
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May 28, 2016 1: Initial release
June 1, 2016 2: Last revision

XI. DISCLOSURE TIMELINE
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May 28, 2016 1: Vulnerability acquired by Manuel Garcia Cardenas
May 28, 2016 2: Send to vendor
May 30, 2016 3: New version that includes patched code
http://cmsimple.org/downloadcounter/dlcount/count.php?id=31
June 1, 2016 4: Sent to 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