Since then researcher Dan Guido posted a series of tweets with some analysis of the exploit itself. On Tuesday just after noon Pacific time, someone published a 0 day exploit for Firefox and Tor to the tor browser mailing list. An attackers goal would be to compromise workstations of visitors to WordPress websites that have been hacked. So our forensic team is keeping an eye on compromised WordPress websites and we expect to see this code show up on a few of them during the next few days. This is a watering hole attack, meaning that a victim has to visit a website that contains this exploit code to be attacked. The exploit code is now public knowledge so we expect new variants of this attack to emerge rapidly. But this code can likely be repurposed to infect workstations with malware or ransomware. There is no fix at the time of this writing.Ĭurrently this exploit causes a workstation report back to an IP address based at OVH in France. The exploit is in the wild, meaning it’s now public and every hacker on the planet has access to it. The vulnerability allows an attacker to execute code on your Windows workstation. If you use Firefox, we recommend you temporarily switch browsers to Chrome, Safari or a non-firefox based browser that is secure until the Firefox dev team can release an update. Currently it exploits Windows systems with a high success rate and affects Firefox versions 41 to 50 and the current version of the Tor Browser Bundle which contains Firefox 45 ESR. A few hours ago a zero day vulnerability emerged in the Tor browser bundle and the Firefox web browser. We’re publishing this as an emergency bulletin for our customers and the larger web community. I also posted an extended update at the end of the post including data indicating this exploit may be part of a law enforcement operation. Tor have also released a fix with version 6.0.7 of their browser.There is also a Thunderbird fix out, version 45.5.1. Update to Firefox 50.0.2 now to patch this vulnerability. Update at 2:32pm PST / 5:32pm EST: Firefox released a fix for this a few minutes ago. Emergency Bulletin: Firefox 0 day in the wild.
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