Google Toolbar Dialog Spoofing Vulnerability

Google Toolbar allows spoofing the information presented in the dialog which is being displayed when adding a new Google Toolbar button. This can allow an attacker to convince the users that his button comes from a trusted domain. This button can then be used to download malicious files or conduct phishing attacks (e.g. show a login form of a bank).

Affected versions
Google Toolbar 5 beta for Internet Explorer
Google Toolbar 4 for Internet Explorer
Google Toolbar 4 for Firefox (partially)

Proof of Concept is available.

Workaround / Suggestion

Google have acknowledged this and are already working on a fix.
Until a fixed version is provided, I suggest to avoid adding new buttons to the toolbar.

Details at

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