XAMPP 1.8.1 - 'lang.php?WriteIntoLocalDisk method' Local Write Access

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INTERNET SECURITY AUDITORS ALERT 2013-007
- Original release date: March 14th, 2013
- Last revised:  March 19th, 2013
- Discovered by: Manuel García Cárdenas
- Severity: 6,8/10 (CVSS Base Score)
- CVE-ID: CVE-2013-2586
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I. VULNERABILITY
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XAMPP 1.8.1 Local Write Access Vulnerability

II. BACKGROUND
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XAMPP is a free and open source cross-platform web server solution stack
package, consisting mainly of the Apache HTTP Server, MySQL database, and

interpreters for scripts written in the PHP and Perl programming languages.

III. DESCRIPTION
-------------------------
It has been detected than an unprivileged user can write in the local
disk and the local file "lang.tmp" can be modified in the remote machine.

The injection is done through the page "/xampp/lang.php".

IV. PROOF OF CONCEPT
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Malicious Request

http://vulnerablesite.com/xampp/lang.php?WriteIntoLocalDisk

And next, if we access to the file:

http://vulnerablesite.com/xampp/lang.tmp

We can verify that the file was modified.

V. BUSINESS IMPACT
-------------------------
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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XAMPP 1.8.1

VII. SOLUTION
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All data received by the application that can be modified by the user
must be validated.

VIII. REFERENCES
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http://www.apachefriends.org
http://www.isecauditors.com

IX. CREDITS
-------------------------
This vulnerability has been discovered
by Manuel García Cárdenas (mgarcia (at) isecauditors (dot) com).

X. REVISION HISTORY
------------------------
March           14, 2013: Initial release
September   26, 2013: Final release

XI. DISCLOSURE TIMELINE
-------------------------
March            14, 2013: Vulnerability acquired by Internet Security
Auditors (www.isecauditors.com).
March            16, 2013: CVE-ID received.
March            18, 2013: Sent to Development Manager.
August           30, 2013: New version that includes patched code.
September   26, 2013: Sent to lists.


XII. LEGAL NOTICES
-------------------------
The information contained within this advisory is supplied "as-is" with
no warranties or guarantees of fitness of use or otherwise. Internet
Security

Auditors accepts no responsibility for any damage caused by the use or
misuse of this information.

XIII. ABOUT
-------------------------
Internet Security Auditors is a Spain based leader in web application
testing, network security, penetration testing, security compliance
implementation and

assessing. Our clients include some of the largest companies in areas
such as finance, telecommunications, insurance, ITC, etc. We are vendor
independent

provider with a deep expertise since 2001. Our efforts in R&D include
vulnerability research, open security project collaboration and
whitepapers,

presentations and security events participation and promotion. For
further information regarding our security services, contact us.

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-------------------------
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