Cisco SPA100 Series Analog Telephone Adapters Remote Code Execution Vulnerabilities

Vulnerability

Multiple vulnerabilities in Cisco SPA100 Series Analog Telephone Adapters (ATAs) firmware allow an authenticated, adjacent attacker to execute arbitrary code with elevated privileges. The vulnerabilities exist within the web-based management interface, which is enabled by default, due to improper validation of user-supplied input. Affected versions include all prior to the fixed firmware release [1].

Exploitation

An attacker must first authenticate to the web-based management interface of an affected device. The attacker then sends crafted requests to the device's web management interface. The attacker must be adjacent to the device (i.e., on the same network segment) to access the interface [1].

Impact

Successful exploitation allows the attacker to execute arbitrary code with elevated privileges on the affected device. This could lead to full compromise of the ATA, including disclosure of configuration data, alteration of device settings, and potential use as a pivot point for further attacks on the network [1].

Mitigation

Cisco has released free software updates that address these vulnerabilities. Customers should upgrade to the latest firmware for the Cisco SPA100 Series ATAs as specified in the advisory [1]. No workarounds are provided; the web-based management interface is enabled by default and may be necessary for management.