Cross-zone vulnerability in Mozilla Firefox 1.5.0.9 considers blocked popups to have an internal zone origin, which allows user-assisted remote attackers to cross zone restrictions and read arbitrary file:// URIs by convincing a user to show a blocked popup.
Exploitability
AV:NAC:MAu:NImpact
C:PI:NA:N4.3/AV:N/AC:M/Au:N/C:P/I:N/A:N