Adrian Pastor has reported some vulnerabilities and a security issue in BT Home Hub/Thomson SpeedTouch 7G routers, which can be exploited by malicious people to conduct cross-site scripting, cross-site request forgery, and script insertion attacks, and to bypass certain security restrictions.

1) An input validation error when processing URLs can be exploited to e.g. gain access and apply changes to password-protected resources (e.g. configuration and settings pages) via a specially-crafted URL containing a path name with additional characters placed at the end (i.e. %5C, '%', '~', and '/').

2) Input passed via the login username is not properly sanitised before being logged. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when a malicious log is viewed.

3) Input passed to the "name" parameter is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

This is similar to:
SA19069

4) Input passed to the "url" parameter in cgi/b/ic/connect/ is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

5) Users are able to perform certain actions via HTTP requests without the device performing any validity checks to verify the request. This can be exploited to e.g. change the administrator password by enticing a logged-in administrator to visit a malicious site.

6) Certain pages (e.g. Wireless Security page) can be accessed without authentication by directly accessing the URL.

It is also possible for an admin user to save and backup or load a config file, which is supposed to be only accessible by the tech account, by directly accessing certain URLs.

The vulnerabilities and security issue are reported in firmware version 6.2.2.6. Other versions may also be affected.

Solution
Security issue #6 has reportedly been fixed in firmware version 6.2.6.B.
Further details available to Secunia VIM customers

Provided and/or discovered by
Adrian Pastor

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://www.gnucitizen.org/blog/bt-home-flub-pwnin-the-bt-home-hub-4
http://www.gnucitizen.org/blog/holes-in-embedded-devices-authentication-bypass-pt-1/

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers