The Opera Team reports:
Scripts are able to change the addresses of framed pages that
come from the same site. Due to a flaw in the way that Opera checks
what frames can be changed, a site can change the address of frames
on other sites inside any window that it has opened. This allows
sites to open pages from other sites, and display misleading
information on them.
Custom shortcut and menu commands can be used to activate external
applications. In some cases, the parameters passed to these
applications are not prepared correctly, and may be created from
uninitialized memory. These may be misinterpreted as additional
parameters, and depending on the application, this could allow
execution of arbitrary code.
Successful exploitation requires convincing the user to modify
their shortcuts or menu files appropriately, pointing to an
appropriate target application, then to activate that shortcut at
an appropriate time. To inject code, additional means will have to
be employed.
When insecure pages load content from secure sites into a frame,
they can cause Opera to incorrectly report the insecure site as
being secure. The padlock icon will incorrectly be shown, and the
security information dialog will state that the connection is
secure, but without any certificate information.
As a security precaution, Opera does not allow Web pages to
link to files on the user's local disk. However, a flaw exists
that allows Web pages to link to feed source files on the
user's computer. Suitable detection of JavaScript events and
appropriate manipulation can unreliably allow a script to
detect the difference between successful and unsuccessful
subscriptions to these files, to allow it to discover if the
file exists or not. In most cases the attempt will fail.
It has been reported that when a user subscribes to a news
feed using the feed subscription button, the page address
can be changed. This causes the address field not to update
correctly. Although this can mean that misleading
information can be displayed in the address field, it can
only leave the attacking page's address in the address bar,
not a trusted third party address.