An authenticated OS command injection vulnerability exists in Netgear routers (tested on the DGN2200B model) firmware versions 1.0.0.36 and prior via the pppoe.cgi endpoint. A remote attacker with valid credentials can execute arbitrary commands via crafted input to the pppoe_username parameter. This flaw allows full compromise of the device and may persist across reboots unless configuration is restored.
The vulnerability is located in the pppoe.cgi endpoint, where the pppoe_username parameter is not properly filtered before being passed to a system call. An attacker with valid credentials can submit crafted input containing additional system commands that will be executed by the router with operating system privileges. According to the vulnerability description, the effects of exploitation may persist after device restart unless the original configuration is restored.
An attacker can gain full control of the device by executing arbitrary commands in the router's operating system, which includes modifying configuration, intercepting network traffic, and maintaining persistent access.
Apply patches available from the manufacturer according to the references. If an update is not available, it is recommended to restrict access to the router's administrative interface to trusted IP addresses only and disable remote access to the management panel.
Netgear DGN2200B with firmware version 1.0.0.36 and earlier
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XNetgear Dgn2200b
HWNetgearall versionsNetgear Dgn2200b Firmware
OSNetgear≤ 1.1.0.36
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