Cisco Unified IP Phone 9900 Series Insecure Device Permissions Vulnerability

A vulnerability in the Cisco Unified IP Phone 9900 Series could allow an authenticated, local attacker to cause a complete denial of service (DoS) on an affected device.

The vulnerability is due to insecure file permissions on some devices. An attacker could exploit this vulnerability by writing to an affected device. Insecure writes to an affected device could allow the attacker to cause the device to hang, reboot, or prevent booting.

Cisco has confirmed the vulnerability in a security notice and released software updates.

To exploit this vulnerability, an attacker must authenticate and have local access to the targeted device. These requirements likely decrease the possibility of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.