Advisory Text :  

Hello,

Will keep it brief. A couple of browser bugs, fresh from the oven, hand
crafted with love:

1) Title : MSIE page update race condition (CRITICAL)
Impact : cookie stealing / setting, page hijacking, memory
corruption
Demo : http://lcamtuf.coredump.cx/ierace/

...aka the bait & switch vulnerability.

When Javascript code instructs MSIE6/7 to navigate away from a page
that meets same-domain origin policy (and hence can be scriptually
accessed and modified by the attacker) to an unrelated third-party
site, there is a window of opportunity for concurrently executed
Javascript to perform actions with the permissions for the old page,
but actual content for the newly loaded page, for example:

- Read or set victim.document.cookie,

- Arbitrarily alter document DOM, including changing form submission
URLs, injecting code,

- Read or write DOM structures that were not fully initialized,
prompting memory corruption and browser crash.

This is tested on MSIE6 and MSIE7, fully patched.

2) Title : Firefox Cross-site IFRAME hijacking (MAJOR)
Impact : keyboard snooping, content spoofing, etc
Demo : http://lcamtuf.coredump.cx/ifsnatch/
Bugzilla : https://bugzilla.mozilla.org/show_bug.cgi?id=382686 [May
30]

Javascript can be used to inject malicious code, including key-snooping
event handlers, on pages that rely on IFRAMEs to display contents or
store state data / communicate with the server.

This is related to a less severe variant independently reported by
Ronen Zilberman two weeks earlier (bug 381300).

3) Title : Firefox file prompt delay bypass (MEDIUM)
Impact : non-consentual download or execution of files
Demo : http://lcamtuf.coredump.cx/ffclick2/
Bugzilla : https://bugzilla.mozilla.org/show_bug.cgi?id=376473 [Apr
04]

A sequence of blur/focus operations can be used to bypass delay timers
implemented on certain Firefox confirmation dialogs, possibly
enabling
the attacker to download or run files without user's knowledge or
consent.

3) Title : MSIE6 URL bar spoofing (MEDIUM)
Impact : mimicking an arbitrary site, possibly including SSL data
Demo : http://lcamtuf.coredump.cx/ietrap2/

MSIE6 vulnerability, similar but unrelated to my earlier onUnload
entrapment flaw, allows sites to spoof URL bar data.

MSIE7 is not affected because of certain high-level changes in the
browser.