Zerodium Discloses Flaw That Allows Code Execution in Tor Browser

September 11, 2018


Exploit acquisition firm Zerodium has disclosed a NoScript vulnerability that can be exploited to execute arbitrary JavaScript code in the Tor Browser even if the maximum security level is used.

Zerodium disclosed the flaw and provided instructions on how it can be reproduced in a single message posted to Twitter on Monday. The recently released Tor Browser 8 is not affected.

While the tweet describes the issue as a vulnerability or backdoor in the Tor Browser, the flaw actually impacts NoScript, a popular Firefox extension designed to protect users against malicious scripts by allowing JavaScript, Java, and Flash plugins to be executed only on trusted websites. The Tor Browser is based on Firefox and it includes NoScript by default.

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