3G and 4G USB modems are a security threat, researcher says

The vast majority of 3G and 4G USB modems handed out by mobile operators to their customers are manufactured by a handful of companies and run insecure software, according to two security researchers from Russia.

Researchers Nikita Tarakanov and Oleg Kupreev analyzed the security of 3G/4G USB modems obtained from Russian operators for the past several months. Their findings were presented Thursday at the Black Hat Europe 2013 security conference in Amsterdam.

Most 3G/4G modems used in Russia, Europe, and probably elsewhere in the world, are made by Chinese hardware manufacturers Huawei and ZTE, and are branded with the mobile operators' logos and trademarks, Tarakanov said. Because of this, even if the research was done primarily on Huawei modems from Russian operators, the results should be relevant in other parts of the world as well, he said.

Tarakanov said that they weren't able to test baseband attacks against the Qualcomm chips found inside the modems because it's illegal in Russia to operate your own GSM base station if you're not an intelligence agency or a telecom operator. "We'll probably have to move to another country for a few months to do it," he said.

There's still a lot to investigate in terms of the hardware's security. For example, the SoC (system on a chip) used in many modems has Bluetooth capability that is disabled from the firmware, but it might be possible to enable it, the researcher said.

For now, the researchers tested the software preloaded on the modems and found multiple ways to attack it or to use it in attacks.

For one, it's easy to make an image of the USB modem's file system, modify it and write it on the modem again. There's a tool available from Huawei to do modem backup and restore, but there are also free tools that support modems from other manufacturers, Tarakanov said.

Malware running on the computer could detect the model and version of the active 3G modem and could write an image with malicious customizations to it using such tools. That modem would then compromise any computer it's used on.

The modem contains the installer for an application that gets installed on the computer, as well as the necessary drivers for different OSes. The application allows the user to stop, start and manage the Internet connection established through the modem.

The configuration files for the installed application, as well as those of the application installer stored on the modem, are in plain text and can be easily modified. One setting in the configuration files defines what DNS servers the modem should use for the Internet connection.