A vulnerability was found in uTorrent (Peer-to-Peer Software) (unknown version). It has been rated as critical. Affected by this issue is an unknown code block of the component JSON RPC Server. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability.

The weakness was shared 01/31/2018 by Tavis Ormandy (taviso) as confirmed bug report (Website). The advisory is shared for download at bugs.chromium.org. The vendor cooperated in the coordination of the public release. This vulnerability is handled as CVE-2018-25041. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1068. The advisory points out:

By default utorrent Classic creates a JSON RPC server on port 10000, it's not clear to me that this was intentionally exposed to the web, as many endpoints crash or interfere with the UI.

A public exploit has been developed by Tavis Ormandy and been published immediately after the advisory. The exploit is available at lock.cmpxchg8b.com. It is declared as functional. The code used by the exploit is:

$ curl -sI 'http://localhost:10000/proxy/0/?sid=2&file=0&callback=file'
HTTP/1.1 200 OK
Content-Type: audio/mpeg
Server: BitTorrentProxy/1.0
Connection: close
Accept-Ranges: bytes
ETag: "8FD54C339FE8B8A418CE2299AF2EADD9B1715D7A"

Nevertheless, browsing through the available endpoints I noticed that the /proxy/ handler is enabled and exposed by default, and allows any website to enumerate and copy any files you've downloaded. To be clear, any website you visit can read and copy every torrent you've downloaded. This works with the default configuration.

Upgrading eliminates this vulnerability.Addressing this vulnerability is possible by firewalling tcp/10000. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Exploit-DB (44151). scmagazineuk.com is providing further details. The entries 113803, 113805, 113806 and 113807 are related to this item.

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• Peer-to-Peer Software

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• uTorrent

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