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September 16, 2016 10:00 pm

Mozilla Checks If Firefox Is Affected By Same Malware Vulnerability As Tor

Mozilla is investigating whether the fully patched version of Firefox is affected by the same cross-platform, malicious code-execution vulnerability patched on Friday in the Tor browser. Dan Goodin, reporting for ArsTechnica: The vulnerability allows an attacker who has a man-in-the-middle position and is able to obtain a forged certificate to impersonate Mozilla servers, Tor officials warned in an advisory. From there, the attacker could deliver a malicious update for NoScript or any other Firefox extension installed on a targeted computer. The fraudulent certificate would have to be issued by any one of several hundred Firefox-trusted certificate authorities (CA). While it probably would be challenging to hack a CA or trick one into issuing the necessary certificate for addons.mozilla.org, such a capability is well within reach of nation-sponsored attackers, who are precisely the sort of adversaries included in the Tor threat model. In 2011, for instance, hackers tied to Iran compromised Dutch CA DigiNotar and minted counterfeit certificates for more than 200 addresses, including Gmail and the Mozilla addons subdomain.

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