CVE-2023-39674

Vulnerability

A buffer overflow vulnerability exists in D-Link DIR-880 router firmware version A1_FW107WWb08 within the fgets function. The flaw occurs when the function reads input without proper bounds checking, allowing an attacker to write data beyond the allocated buffer. This vulnerability is present in the firmware as distributed and does not require any special configuration to be reachable.

Exploitation

An attacker with network access to the router's management interface can exploit this vulnerability by sending a crafted input that triggers the buffer overflow. The exact attack vector is not publicly detailed, but it likely involves sending a long string to a vulnerable endpoint that uses fgets. No authentication is required if the management interface is exposed.

Impact

Successful exploitation of the buffer overflow could lead to a denial of service (device crash) or potentially allow arbitrary code execution with the privileges of the affected process. This could compromise the confidentiality, integrity, and availability of the device and the network it serves.

Mitigation

D-Link has not released a specific security advisory for CVE-2023-39674 as of the publication date. The DIR-880 model may have reached end-of-life (EOL) status, as indicated by D-Link's support page [1]. Users should check the D-Link support site for any firmware updates or consider replacing the device if it is no longer supported. No workaround is currently available.