This report is the continuation of "#root via SMS", a research made by the SCADA Strangelove team in 2014. It was devoted to telecommunications equipment vulnerabilities with modem flaws only partially covered. This document describes vulnerabilities found and exploited in eight popular 3G and 4G modems available in Russia and worldwide. The findings include Remote Code Execution (RCE) in web scripts, integrity attacks, Cross-Site Request Forgery (CSRF), and Cross-Site Scripting (XSS).
The research covers a full range of attacks against carrier customers using these types of modems — device identification, code injection, PC infection, SIM card cloning, data interception, determining subscriber location, getting access to user accounts on the operator's website, and APT attacks.