Vulnerability Spotlight: How an attacker could chain several vulnerabilities in an industrial wireless router to gain root access

Francesco Benvenuto of Cisco Talos discovered these vulnerabilities. Blog by Francesco Benvenuto and Jon Munshaw. 

Cisco Talos recently discovered several vulnerabilities in InHand Networks’ InRouter302 that could allow an attacker to escalate their privileges on the targeted device from a non-privileged user to a privileged one. There are also multiple vulnerabilities that could allow an adversary to reach unconstrained root privileges. The router has one privileged user and several non-privileged ones. 

The InRouter is an industrial LTE router that includes remote management functionalities and several security protection mechanisms, such as VPN connections and a firewall. 

The router can be managed mainly in two ways: through the web interface, and through a router console accessible by telnet or, if enabled, SSH. The router does not provide access in any way to the Linux system beneath the router functionalities. 

The chart below, which includes only a subset of all the discovered vulnerabilities, shows the different paths an attacker could take to obtain root access after the user clicks on an attacker-controlled link. It would be possible to chain the vulnerabilities discovered in several ways to obtain root access on the device:

Cisco Talos worked with InHand Networks to ensure that this issue is resolved and an

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