WordPress MU < 2.7 'Host' HTTP Header Cross Site Scripting (XSS) Vulnerability
Cross-Site Scripting in WordPress MU via the HTTP Host header.
Antecedentes
WordPress MU (multisite) allows you to run unlimited blogs with a single installation of WordPress. It is the engine behind WordPress.com and is used by sites such as Harvard University and Le Monde.
Description
WordPress MU prior to version 2.7 does not correctly sanitize the Host header in the choose_primary_blog function, making it vulnerable to XSS attacks. Sites with name-based virtual hosting are not affected unless they are the default virtual host.
Business impact
An attacker can obtain administrator privileges in the application.
Affected systems
Versions earlier than 2.7.
Solución
Update to version 2.7 of multi-user WordPress.
Calendario de divulgación
References
The information contained within this advisory is supplied 'as-is' with no warranties or guarantees of fitness for use or otherwise. Internet Security Auditors accepts no responsibility for any damage caused by the use or misuse of this information.
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