The popular torrent client known as uTorrent used to be a very minimal and lightweight program, but BitTorrent Inc. has loaded it down with more and more features over the years. According to Googler Travis Ormandy, one of uTorrent’s features has left users wide open to a serious attack. Ormandy alerted the company to the flaw and expressed concern it would be patched in time for the 90-day disclosure deadline. A patch is rolling out now, but it’s unclear how effective the fix will be.
Ormandy is part of Google’s Project Zero, a team dedicated to finding bugs in software before the bad guys do. As part of his work on torrent clients, Ormandy reached out to BitTorrent Inc last November with details on a serious remote code execution vulnerability in its uTorrent software. A remote code execution vulnerability is bad news as it can allow an attacker to take over your system completely. Despite being a big deal, BitTorrent waited until the last minute to issue a patch.
Based on the demo provided by Ormandy, uTorrent appears to have a number of DNS rebinding exploits in Windows. It’s related to the program’s remote control feature, which allows the system’s owner to manage torrents from a web browser in another location. However, the authentication token for this feature is ridiculously easy to compromise. With that, the attacker can install anything on a computer.
BitTorrent Inc has rolled out a patch to the beta version of the client and says the stable version will be patched within a week. The fix involves adding a second token to the web interface. Ormandy notes this does break his exploits, but he believes this token, too, is vulnerable. If that’s the case, it may be a simple matter for someone else to update the exploit. He describes uTorrent as having “a lot of unnecessary remote attack surface.”
I just fixed the exploit and verified it still works. I would recommend asking BitTorrent to resolve this issue if you're affected, and it works in the default configuration so you probably are. Sigh.
— Tavis Ormandy (@taviso) February 20, 2018
The company’s engineering VP Dave Rees says that the patch fixes the issue, and everyone should update. That’s sound advice, but it sounds like Ormandy was not convinced of the patch’s effectiveness. If you’re going to continue using uTorrent, it might be smart to disable the remote access features entirely until we know for sure the DNS rebinding exploits have been fixed.
Ormandy has promised to release a series of vulnerabilities in Torrent clients. He already exposed a similar flaw in the popular Transmission torrent client.
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