The Four-Faith F3x36 router using firmware v2.0.0 is vulnerable to an authentication bypass vulnerability in the administrative web server. Authentication is not enforced on some administrative functionality when using the "bapply.cgi" endpoint instead of the normal "apply.cgi" endpoint. A remote and unauthenticated can use this vulnerability to modify settings or chain with existing authenticated vulnerabilities.
The router's web application requires authentication for the standard 'apply.cgi' endpoint, but does not enforce it for the alternative 'bapply.cgi' endpoint, which provides some of the same administrative functionality. An attacker can direct requests directly to 'bapply.cgi', completely bypassing the access control mechanism (CWE-306 – Missing Authentication for Critical Function, CWE-489 – Active Residual Developer/Diagnostic Endpoint). The vulnerability is exploitable remotely over the network without requiring an account or user interaction.
An attacker can modify router settings without authentication, and can combine this vulnerability with other flaws requiring prior authentication, potentially gaining full control of the device, intercepting network traffic, or disrupting network availability.
Apply patches available from the manufacturer according to the references. Until updates are deployed, it is recommended to restrict access to the administrative panel only to trusted IP addresses (e.g., via firewall or ACL) and isolate devices in a dedicated network segment.
Four-Faith F3x36 router with firmware version v2.0.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HFour Faith F3x36
HWFour-Faithwszystkie wersjeFour Faith F3x36 Firmware
OSFour-Faith2.0
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