Monthly ArchivesNovember 2020

Proofpoint Patches URL Sandbox Bypass Bug standard

Or, how a travel website’s newsletter clued me in to a huge security gap in a popular email protection service. tl;dr: I discovered URLs of sufficient length (over 770 characters) would bypass Proofpoint’s URLDefense service leaving the original link untouched, allowing malicious links directly into users’ email inboxes. Proofpoint let me know this week that they finally have patched all the instances of their service that had this particular bug, so it’s time to disclose how I discovered it. Many of you know I switched my personal email protection away from Postini/Google Apps for Business to modusCloud by Vircom. My users and I are 100% satisfied with the service! One of the technologies powering Vircom is Proofpoint Essentials, and one ...

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