Kodi 17.6 - Persistent Cross-Site Scripting

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MGC ALERT 2018-003
- Original release date: March 19, 2018
- Last revised:  April 16, 2018
- Discovered by: Manuel Garcia Cardenas
- Severity: 4,8/10 (CVSS Base Score)
- CVE-ID: CVE-2018-8831
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I. VULNERABILITY
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Kodi <= 17.6 - Persistent Cross-Site Scripting

II. BACKGROUND
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Kodi (formerly XBMC) is a free and open-source media player software
application developed by the XBMC Foundation, a non-profit technology
consortium. Kodi is available for multiple operating systems and hardware
platforms, with a software 10-foot user interface for use with televisions
and remote controls.

III. DESCRIPTION
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Has been detected a Persistent XSS vulnerability in the web interface of
Kodi, 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
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Go to: Playlist -> Create

Create a playlist injecting javascript code:

<img src=x onerror=alert(1)>

The XSS is executed, in the victim browser.

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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Kodi <= 17.6

VII. SOLUTION
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Vendor include the fix:
https://trac.kodi.tv/ticket/17814

VIII. REFERENCES
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https://kodi.tv/

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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March 19, 2018 1: Initial release
April 16, 2018 2: Last revision

XI. DISCLOSURE TIMELINE
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March 19, 2018 1: Vulnerability acquired by Manuel Garcia Cardenas
March 19, 2018 2: Send to vendor
March 30, 2018 3: Vendo fix
April 16, 2018 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