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Firefox security glitch exploited by malicious ad that could steal users’ local files

Firefox security glitch exploited by malicious ad that could steal users’ local files

August 7, 2015

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Heads up, Firefox users — Mozilla is urging you to update your browser post-haste, after a rogue advertisement on a Russian news site was found to be exploiting a vulnerability that compromised Firefox users’ local files.

“The vulnerability comes from the interaction of the mechanism that enforces JavaScript context separation (the “same origin policy”) and Firefox’s PDF Viewer,” explained Mozilla’s security head, Daniel Veditz, in a blog post.

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