CVE-2022-34973

Vulnerability

A buffer overflow vulnerability exists in D-Link DIR820LA1 firmware version FW106B02 within the ping.ccp endpoint. The nextPage parameter is not properly bounds-checked, allowing an attacker to overflow a buffer by supplying an overly long value. This issue affects the DIR820LA1 model with the specified firmware version [1].

Exploitation

An attacker with network access to the device can exploit this vulnerability by sending a crafted HTTP request to the ping.ccp page with an excessively long nextPage parameter. No authentication is explicitly required, as the ping.ccp endpoint may be accessible without prior login. The attacker does not need any special privileges beyond network connectivity to the device's web interface [1].

Impact

Successful exploitation of the buffer overflow can lead to a denial of service (device crash or reboot) or potentially allow arbitrary code execution on the device. The attacker could gain full control of the router, leading to information disclosure, network compromise, or further attacks on internal systems [1].

Mitigation

As of the publication date, D-Link has not released a firmware update to address this vulnerability. The DIR820LA1 model may be end-of-life (EOL), meaning no further security patches are provided. Users are advised to replace the device with a supported model or restrict network access to the router's management interface as a workaround [1].