CVE-2023-43892

Vulnerability

A blind command injection vulnerability exists in the Netis N3Mv2 router firmware version V1.0.1.865. The flaw resides in the WAN settings where the Hostname parameter is not properly sanitized before being processed by the system. This allows an attacker to inject arbitrary operating system commands through a crafted payload submitted via the router's web management interface. The vulnerability affects firmware version V1.0.1.865 [1].

Exploitation

An attacker must be able to access the router's WAN settings page, which typically requires being on the local network or having administrative credentials. However, the reference indicates exploitation can be done without authentication if the management interface is exposed. The attacker crafts a malicious payload for the Hostname parameter, which when processed by the router, executes arbitrary commands blindly (without output being returned to the attacker). A proof-of-concept video is available [1].

Impact

Successful exploitation allows an attacker to execute arbitrary OS commands on the vulnerable router with root or system privileges. This can lead to complete compromise of the device, including unauthorized access, data exfiltration, further network attacks, or permanent modification of router settings. The blind nature of the injection means the attacker does not see command output directly, but can use out-of-band techniques or side effects to verify execution [1].

Mitigation

As of the publication date 2023-10-02, no official patch or fixed firmware version has been released by Netis. Users are advised to restrict access to the router's management interface to trusted networks only, disable remote management if not required, and monitor for any future firmware updates from the manufacturer [1].