CVE-2022-28689: TALOS-2022-1521 || Cisco Talos Intelligence Group

SUMMARY

A leftover debug code vulnerability exists in the console support functionality of InHand Networks InRouter302 V3.5.45. A specially-crafted network request can lead to arbitrary command execution. An attacker can send a sequence of requests to trigger this vulnerability.

CONFIRMED VULNERABLE VERSIONS

The versions below were either tested or verified to be vulnerable by Talos or confirmed to be vulnerable by the vendor.

InHand Networks InRouter302 V3.5.45

PRODUCT URLS

InRouter302 - https://www.inhandnetworks.com/products/inrouter300.html

CVSSv3 SCORE

6.5 - CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CWE

CWE-489 - Leftover Debug Code

DETAILS

The InRouter302 is an industrial LTE router. It features remote management functionalities and several security protection mechanisms, such as: VPN technologies, firewall functionalities, authorization management and several other features.

The InRouter302 offers telnet and sshd services. Both, when provided with the correct credentials, will allow access to the Router console.

Here is the prompt after the login:

************************************************
           Welcome to Router console
      Inhand
      Copyright @2001-2022, Beijing InHand Networks Co., Ltd.
      http://www.inhandnetworks.com
------------------------------------------------
Model                : IR302-WLAN
Serial Number        : RF3022141057203
Description          : www.inhandnetworks.com
Current Version      : V3.5.45
Current Bootloader Version : 1.1.3.r4955
------------------------------------------------
get help for commands
------------------------------------------------
type '?' for detail help at any point
================================================
  help           -- get help for commands
  language       -- Set language
  show           -- show system information
  exit           -- exit current mode/console
  ping           -- ping test
  comredirect    -- COM redirector
  telnet         -- telnet to a host
  traceroute     -- trace route to a host
  enable         -- turn on privileged commands
Router>

The Router console contains a command, called support, that is not listed among the available functionalities. This is probably a leftover debug code. This command allows to enable or disable the inhand command, leading to enable advisory TALOS-2022-1477 again.

Exploit Proof of Concept

The command allows to enable the inhand command in the router console, specifying enable as argument:

Router> inhand
Router> support
0*wsuppP�)w
================================================
Arguments:
enable
disable
Router> support enable
Router> inhand
input password:

TIMELINE

2022-06-07 - Vendor Disclosure
2022-10-25 - Vendor Patch Release
2022-10-27 - Public Release

Discovered by Francesco Benvenuto of Cisco Talos.