Title: Update Scanner 'onerror' HTML Injection Vulnerability
Severity: HIGH
Description:
Update Scanner is an extension for Mozilla Firefox that monitors web pages for updates.
Update Scanner is prone to an HTML-injection vulnerability because it fails to properly sanitize user-supplied input before using it in dynamically generated content. Specifically, it fails to properly sanitize the data in the 'onerror' event handler.
Attacker-supplied HTML and script code would run in the context of the affected browser, potentially allowing the attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user. Arbitrary script code supplied by the attacker would run with elevated privileges since it is rendered with 'chrome' privileges.
This issue affects versions prior to Update Scanner 3.0.4.
Affected Products:
- Update Scanner Update Scanner 3.0.3
References:
- Security-Assessment.com: Update Scanner (Mozilla Firefox Extension) – Chrome Privileged Code Injection
- Update Scanner: Update Scanner Homepage
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