Michal Zalewski has discovered a vulnerability in Mozilla Firefox, which can be exploited by malicious people to disclose sensitive information and conduct spoofing attacks.
The vulnerability is caused due to an error in the handling of the "wyciwyg://" URI handler. This can be exploited to access or spoof contents from a previously cached web site e.g. via HTTP 302 redirects when a user visits a malicious web page.
The vulnerability is confirmed in version 220.127.116.11. Other versions may also be affected.
Solution: Update to version 18.104.22.168.
Provided and/or discovered by: Michal Zalewski
Original Advisory: Mozilla:
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