In a Secunia Advisory they have discovered two vulnerabilities in Mozilla, Mozilla Firefox, and Camino, which can be exploited by malicious web sites to obtain sensitive information and spoof dialog boxes.
1) Inactive tabs can launch dialog boxes so they appear to be displayed by a web site in another tab. This can be exploited by a malicious web site to show a dialog box, which seems to originate from a trusted web site.
2) Inactive tabs can gain focus from form fields on web sites in another tab. This can potentially be exploited to collect sensitive data entered in form fields on other web sites.
Secunia's solution is don't visit trusted web sites while visiting untrusted web sites or disable JavaScript.
Mozilla apparantly have been aware of this vulnerability since October 4th. It has now just been made public.
The form focus tab flaw (the second issue) was fixed on the Aviary branch (1.0 releases of Firefox and Thunderbird) and the 1.7 branch on October 6th. The fix is more of a workaround than a proper solution. The first issue is still open.
You can test for vulnerablities by visiting the Secunia Advisory page.
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