A vulnerability was found in TeamSpeak Server (affected version not known) and classified as problematic. This issue affects the function VirtualServer::getpermission_fileTransferInitDownload. The manipulation of the argument path with the input value /../../../etc/passwd leads to a information disclosure vulnerability (File). Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality.

The weakness was shared 08/12/2016 by Hanz Jenson as not defined mailinglist post (Full-Disclosure). The advisory is shared at seclists.org. The public release happened without involvement of TeamSpeak. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a private exploit are known. MITRE ATT&CK project uses the attack technique T1592 for this issue. The advisory points out:

The function VirtualServer::getpermission_fileTransferInitDownload accepts a path from the client and gives different error messages depending on whether the file exists or not.

It is declared as proof-of-concept. The advisory illustrates:

For example using "/../../../etc/passwd" gives "bad path" while "/../../../etc/passwz" gives "no such file". This can be used to determine the remote OS and installed software, enumerate open fds, etc.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries 90866, 90867, 90868 and 90870 are related to this item.

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• TeamSpeak

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• Server

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