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MGC ALERT 2019-002
- Original release date: April 10, 2019
- Last revised:  May 22, 2019
- Discovered by: Manuel Garcia Cardenas
- Severity: 4,8/10 (CVSS Base Score)
- CVE-ID: CVE-2019-11226
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I. VULNERABILITY
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CMS Made Simple 2.2.10 - (Authenticated) Persistent Cross-Site Scripting

II. BACKGROUND
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CMS Made Simple (CMSMS) is a free, open source (GPL) content management
system (CMS) to provide developers, programmers and site owners a web-based
development and administration area.

III. DESCRIPTION
-------------------------
Has been detected a Persistent XSS vulnerability in CMS Made Simple, that
allows the execution of arbitrary HTML/script code to be executed in the
context of the victim user's browser.

IV. PROOF OF CONCEPT
-------------------------
Go to: Content -> Content Manager -> News -> Add Article

And post in the m1_title parameter for example
test"><script>alert(1)</script>

The variable "m1_title" it is not sanitized, later, if some user visit the
content in the public area, the XSS is executed, in the response you can
view:

<input type="text" id="fld1" name="m1_title"
value="test"><script>alert(1)</script>

V. BUSINESS IMPACT
-------------------------
An attacker can execute arbitrary HTML or Javascript 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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CMS Made Simple <= 2.2.10

VII. SOLUTION
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Disable until a fix is available, vendor doesn't accept XSS issues inside
admin panel.

VIII. REFERENCES
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https://www.cmsmadesimple.org/

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

X. REVISION HISTORY
-------------------------
April 10, 2019 1: Initial release
May 22, 2019 2: Last revision

XI. DISCLOSURE TIMELINE
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April 10, 2019 1: Vulnerability acquired by Manuel Garcia Cardenas
April 10, 2019 2: Send to vendor
April 22, 2019 3: New request, vendor doesn't accept XSS issues inside
admin panel.
May 22, 2019 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