Mozilla Foundation Security Advisory 2014-20
onbeforeunload and Javascript navigation DOS
- Announced
- March 18, 2014
- Reporter
- Tim Philipp Schäfers, Sebastian Neef
- Impact
- Low
- Products
- Firefox, SeaMonkey
- Fixed in
-
- Firefox 28
- SeaMonkey 2.25
Description
Security researchers Tim Philipp Schäfers and
Sebastian Neef, the team of Internetwache.org, reported a
mechanism using JavaScript onbeforeunload events with page
navigation to prevent users from closing a malicious page's tab and causing the
browser to become unresponsive. This allows for a denial of service (DOS) attack
due to resource consumption and blocks the ability of users to exit the
application.