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The DigiTrust Group: Advisory #080303a - osTicket Persistent Cross-Site Scripting Vulnerability
Product:
osTicket v1.6
Credits:
Omer Singer
The DigiTrust Group
http://www.digitrustgroup.com
March 3, 2008
Risk Level:
HIGH - Vulnerability can be exploited to execute arbitrary HTML and script code in a user's browser session in the context of an affected site. The elevated risk rating reflects the persistent nature of this cross-site scripting attack.
Program Summary:
osTicket is a PHP-based online support ticket system that can receive tickets via e-mail or a web form. In many implementations, no authentication is required for ticket creation.
http://www.osticket.com/
Cross-Site Scripting Vulnerabilities:
1. Input passed to the 'subject' field in open.php is not properly sanitized. When a web site administrator views a specially-crafted ticket, malicious code contained in the 'subject' field may be executed. Possible attacks include stealing cookies, embedding malicious media files, or redirecting the victim to a malicious web site.
2. In addition, the ticket summary page may become corrupted by a maliciously crafted ticket. By submitting an unclosed iframe tag in the subject field of a ticket, a Denial of Service condition will occur wherein an administrator will have to manually remove the ticket from the database.
Sample Exploit Code:
1. Create a ticket with the following subject:
XSS <iframe src=http://www.digitrustgroup.com/xss.html height=10% <
View the individual ticket to see the JavaScript popup.
2. Create a ticket with the following subject:
<iframe foo
Vendor Solution:
Pending. Filter malicious characters and character sequences in a web proxy.
Copyright (c) 2007 The DigiTrust Group.
Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of The DigiTrust Group.
Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use on an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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