Mozilla Foundation Security Advisory 2005-52

Title: Same origin violation: frame calling top.focus()
Severity: High
Reporter: Secunia.com
Products: Firefox, Mozilla Suite

Fixed in: Firefox 1.0.5
Mozilla Suite 1.7.9

Description

A child frame can call top.focus() even if the framing page comes from a different origin and has overridden the focus() routine. The call is made in the context of the child frame. The attacker would look for a target site with a framed page that makes this call but doesn't verify that its parent comes from the same site. By framing this page the attacker could steal cookies and passwords, or take actions on the site on behalf of a signed-in user.

Workaround

Disable Javascript. As a website author verify that a parent frame is from the expected site before calling methods on it.

References

http://secunia.com/advisories/15549/
https://bugzilla.mozilla.org/show_bug.cgi?id=296830